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New stable _security_ releases: Tor 0.3.5.15, 0.4.4.9, and 0.4.5.9
by Nick Mathewson 14 Jun '21

14 Jun '21

Hello, everyone! (If you are about to reply saying "please take me off this list", instead please follow these instructions: https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-announce/ . If you have trouble, it is probably because you subscribed using a different address than the one you are trying to unsubscribe with. You will have to enter the actual email address you used when you subscribed.) Source code for Tor 0.3.5.15, 0.4.4.9, and 0.4.5.9 is now available; since these are older release series, you can download the source code at https://dist.torproject.org/ . Packages should be available within the next several weeks, with a new Tor Browser around the end of the week. This release fixes several security vulnerabilities, described in the changelogs. We are also releasing security fixes for the other supported release series; I'll describe them in a separate email. I recommend that everybody upgrade to 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5 as soon as binaries are available (or right now, if you build from source). Below is the changelog for 0.4.5.9. You can find the changelogs for the other releases at: https://gitweb.torproject.org/tor.git/tree/ChangeLog?h=tor-0.3.5.15 https://gitweb.torproject.org/tor.git/tree/ChangeLog?h=tor-0.4.4.9 Changes in version 0.4.5.9 - 2021-06-14 Tor 0.4.5.9 fixes several security issues, including a denial-of-service attack against onion service clients, and another denial-of-service attack against relays. Everybody should upgrade to one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5. o Major bugfixes (security, backport from 0.4.6.5): - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on half-closed streams. Previously, clients failed to validate which hop sent these cells: this would allow a relay on a circuit to end a stream that wasn't actually built with it. Fixes bug 40389; bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021- 003 and CVE-2021-34548. o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5): - Detect more failure conditions from the OpenSSL RNG code. Previously, we would detect errors from a missing RNG implementation, but not failures from the RNG code itself. Fortunately, it appears those failures do not happen in practice when Tor is using OpenSSL's default RNG implementation. Fixes bug 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as TROVE-2021-004. Reported by Jann Horn at Google's Project Zero. o Major bugfixes (security, denial of service, backport from 0.4.6.5): - Resist a hashtable-based CPU denial-of-service attack against relays. Previously we used a naive unkeyed hash function to look up circuits in a circuitmux object. An attacker could exploit this to construct circuits with chosen circuit IDs, to create collisions and make the hash table inefficient. Now we use a SipHash construction here instead. Fixes bug 40391; bugfix on 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and CVE-2021-34549. Reported by Jann Horn from Google's Project Zero. - Fix an out-of-bounds memory access in v3 onion service descriptor parsing. An attacker could exploit this bug by crafting an onion service descriptor that would crash any client that tried to visit it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei Glazunov from Google's Project Zero. o Minor features (compatibility, backport from 0.4.6.4-rc): - Remove an assertion function related to TLS renegotiation. It was used nowhere outside the unit tests, and it was breaking compilation with recent alpha releases of OpenSSL 3.0.0. Closes ticket 40399. o Minor features (geoip data): - Update the geoip files to match the IPFire Location Database, as retrieved on 2021/06/10. o Minor bugfixes (control, sandbox, backport from 0.4.6.4-rc): - Allow the control command SAVECONF to succeed when the seccomp sandbox is enabled, and make SAVECONF keep only one backup file to simplify implementation. Previously SAVECONF allowed a large number of backup files, which made it incompatible with the sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by Daniel Pinto. o Minor bugfixes (metrics port, backport from 0.4.6.4-rc): - Fix a bug that made tor try to re-bind() on an already open MetricsPort every 60 seconds. Fixes bug 40370; bugfix on 0.4.5.1-alpha.

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New stable _security_ release: Tor 0.4.6.5
by Nick Mathewson 14 Jun '21

14 Jun '21

Hello, everyone! (If you are about to reply saying "please take me off this list", instead please follow these instructions: https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-announce/ . If you have trouble, it is probably because you subscribed using a different address than the one you are trying to unsubscribe with. You will have to enter the actual email address you used when you subscribed.) After months of work, Tor 0.4.6.5 is now available! This is the first stable release in the 0.4.6.x series, and we hope you find it useful. You can download the source code from the download page at https://www.torproject.org/download/tor/ . Packages should be available within the next several weeks, with a new Tor Browser around the end of the week. This release fixes several security vulnerabilities, described below. We are also releasing security fixes for the other supported release series; I'll describe them in a separate email. I recommend that everybody upgrade to 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5 as soon as binaries are available (or right now, if you build from source). Changes in version 0.4.6.5 - 2021-06-14 Tor 0.4.6.5 is the first stable release in its series. The 0.4.6.x series includes numerous features and bugfixes, including a significant improvement to our circuit timeout algorithm that should improve observed client performance, and a way for relays to report when they are overloaded. This release also includes security fixes for several security issues, including a denial-of-service attack against onion service clients, and another denial-of-service attack against relays. Everybody should upgrade to one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5. Below are the changes since 0.4.5.8. For a list of changes since 0.4.6.4-rc, see the ChangeLog file. o Major bugfixes (security): - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on half-closed streams. Previously, clients failed to validate which hop sent these cells: this would allow a relay on a circuit to end a stream that wasn't actually built with it. Fixes bug 40389; bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021- 003 and CVE-2021-34548. o Major bugfixes (security, defense-in-depth): - Detect more failure conditions from the OpenSSL RNG code. Previously, we would detect errors from a missing RNG implementation, but not failures from the RNG code itself. Fortunately, it appears those failures do not happen in practice when Tor is using OpenSSL's default RNG implementation. Fixes bug 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as TROVE-2021-004. Reported by Jann Horn at Google's Project Zero. o Major bugfixes (security, denial of service): - Resist a hashtable-based CPU denial-of-service attack against relays. Previously we used a naive unkeyed hash function to look up circuits in a circuitmux object. An attacker could exploit this to construct circuits with chosen circuit IDs, to create collisions and make the hash table inefficient. Now we use a SipHash construction here instead. Fixes bug 40391; bugfix on 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and CVE-2021-34549. Reported by Jann Horn from Google's Project Zero. - Fix an out-of-bounds memory access in v3 onion service descriptor parsing. An attacker could exploit this bug by crafting an onion service descriptor that would crash any client that tried to visit it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei Glazunov from Google's Project Zero. o Major features (control port, onion services): - Add controller support for creating version 3 onion services with client authorization. Previously, only v2 onion services could be created with client authorization. Closes ticket 40084. Patch by Neel Chauhan. o Major features (directory authority): - When voting on a relay with a Sybil-like appearance, add the Sybil flag when clearing out the other flags. This lets a relay operator know why their relay hasn't been included in the consensus. Closes ticket 40255. Patch by Neel Chauhan. o Major features (metrics): - Relays now report how overloaded they are in their extrainfo documents. This information is controlled with the OverloadStatistics torrc option, and it will be used to improve decisions about the network's load balancing. Implements proposal 328; closes ticket 40222. o Major features (relay, denial of service): - Add a new DoS subsystem feature to control the rate of client connections for relays. Closes ticket 40253. o Major features (statistics): - Relays now publish statistics about the number of v3 onion services and volume of v3 onion service traffic, in the same manner they already do for v2 onions. Closes ticket 23126. o Major bugfixes (circuit build timeout): - Improve the accuracy of our circuit build timeout calculation for 60%, 70%, and 80% build rates for various guard choices. We now use a maximum likelihood estimator for Pareto parameters of the circuit build time distribution, instead of a "right-censored estimator". This causes clients to ignore circuits that never finish building in their timeout calculations. Previously, clients were counting such unfinished circuits as having the highest possible build time value, when in reality these circuits most likely just contain relays that are offline. We also now wait a bit longer to let circuits complete for measurement purposes, lower the minimum possible effective timeout from 1.5 seconds to 10ms, and increase the resolution of the circuit build time histogram from 50ms bin widths to 10ms bin widths. Additionally, we alter our estimate Xm by taking the maximum of the top 10 most common build time values of the 10ms histogram, and compute Xm as the average of these. Fixes bug 40168; bugfix on 0.2.2.14-alpha. - Remove max_time calculation and associated warning from circuit build timeout 'alpha' parameter estimation, as this is no longer needed by our new estimator from 40168. Fixes bug 34088; bugfix on 0.2.2.9-alpha. o Major bugfixes (signing key): - In the tor-gencert utility, give an informative error message if the passphrase given in `--create-identity-key` is too short. Fixes bug 40189; bugfix on 0.2.0.1-alpha. Patch by Neel Chauhan. o Minor features (bridge): - We now announce the URL to Tor's new bridge status at https://bridges.torproject.org/ when Tor is configured to run as a bridge relay. Closes ticket 30477. o Minor features (build system): - New "make lsp" command to auto generate the compile_commands.json file used by the ccls server. The "bear" program is needed for this. Closes ticket 40227. o Minor features (client): - Clients now check whether their streams are attempting to re-enter the Tor network (i.e. to send Tor traffic over Tor), and close them preemptively if they think exit relays will refuse them for this reason. See ticket 2667 for details. Closes ticket 40271. o Minor features (command line): - Add long format name "--torrc-file" equivalent to the existing command-line option "-f". Closes ticket 40324. Patch by Daniel Pinto. o Minor features (command-line interface): - Add build informations to `tor --version` in order to ease reproducible builds. Closes ticket 32102. - When parsing command-line flags that take an optional argument, treat the argument as absent if it would start with a '-' character. Arguments in that form are not intelligible for any of our optional-argument flags. Closes ticket 40223. - Allow a relay operator to list the ed25519 keys on the command line by adding the `rsa` and `ed25519` arguments to the --list-fingerprint flag to show the respective RSA and ed25519 relay fingerprint. Closes ticket 33632. Patch by Neel Chauhan. o Minor features (compatibility): - Remove an assertion function related to TLS renegotiation. It was used nowhere outside the unit tests, and it was breaking compilation with recent alpha releases of OpenSSL 3.0.0. Closes ticket 40399. o Minor features (control port, stream handling): - Add the stream ID to the event line in the ADDRMAP control event. Closes ticket 40249. Patch by Neel Chauhan. o Minor features (dormant mode): - Add a new 'DormantTimeoutEnabled' option to allow coarse-grained control over whether the client ever becomes dormant from inactivity. Most people won't need this. Closes ticket 40228. - Add a new 'DormantTimeoutEnabled' option for coarse-grained control over whether the client can become dormant from inactivity. Most people won't need this. Closes ticket 40228. o Minor features (geoip data): - Update the geoip files to match the IPFire Location Database, as retrieved on 2021/06/10. o Minor features (logging): - Edit heartbeat log messages so that more of them begin with the string "Heartbeat: ". Closes ticket 40322; patch from 'cypherpunks'. - Change the DoS subsystem heartbeat line format to be more clear on what has been detected/rejected, and which option is disabled (if any). Closes ticket 40308. - In src/core/mainloop/mainloop.c and src/core/mainloop/connection.c, put brackets around IPv6 addresses in log messages. Closes ticket 40232. Patch by Neel Chauhan. o Minor features (logging, diagnostic): - Log decompression failures at a higher severity level, since they can help provide missing context for other warning messages. We rate-limit these messages, to avoid flooding the logs if they begin to occur frequently. Closes ticket 40175. o Minor features (onion services): - Add a warning message when trying to connect to (no longer supported) v2 onion services. Closes ticket 40373. o Minor features (performance, windows): - Use SRWLocks to implement locking on Windows. Replaces the "critical section" locking implementation with the faster SRWLocks, available since Windows Vista. Closes ticket 17927. Patch by Daniel Pinto. o Minor features (protocol, proxy support, defense in depth): - Close HAProxy connections if they somehow manage to send us data before we start reading. Closes another case of ticket 40017. o Minor features (tests, portability): - Port the hs_build_address.py test script to work with recent versions of python. Closes ticket 40213. Patch from Samanta Navarro. o Minor features (vote document): - Add a "stats" line to directory authority votes, to report various statistics that authorities compute about the relays. This will help us diagnose the network better. Closes ticket 40314. o Minor bugfixes (build): - The configure script now shows whether or not lzma and zstd have been used, not just if the enable flag was passed in. Fixes bug 40236; bugfix on 0.4.3.1-alpha. o Minor bugfixes (compatibility): - Fix a failure in the test cases when running on the "hppa" architecture, along with a related test that might fail on other architectures in the future. Fixes bug 40274; bugfix on 0.2.5.1-alpha. o Minor bugfixes (compilation): - Fix a compilation warning about unused functions when building with a libc that lacks the GLOB_ALTDIRFUNC constant. Fixes bug 40354; bugfix on 0.4.5.1-alpha. Patch by Daniel Pinto. o Minor bugfixes (consensus handling): - Avoid a set of bugs that could be caused by inconsistently preferring an out-of-date consensus stored in a stale directory cache over a more recent one stored on disk as the latest consensus. Fixes bug 40375; bugfix on 0.3.1.1-alpha. o Minor bugfixes (control, sandbox): - Allow the control command SAVECONF to succeed when the seccomp sandbox is enabled, and make SAVECONF keep only one backup file to simplify implementation. Previously SAVECONF allowed a large number of backup files, which made it incompatible with the sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by Daniel Pinto. o Minor bugfixes (directory authorities, voting): - Add a new consensus method (31) to support any future changes that authorities decide to make to the value of bwweightscale or maxunmeasuredbw. Previously, there was a bug that prevented the authorities from parsing these consensus parameters correctly under most circumstances. Fixes bug 19011; bugfix on 0.2.2.10-alpha. o Minor bugfixes (ipv6): - Allow non-SOCKSPorts to disable IPv4, IPv6, and PreferIPv4. Some rare configurations might break, but in this case you can disable NoIPv4Traffic and NoIPv6Traffic as needed. Fixes bug 33607; bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan. o Minor bugfixes (key generation): - Do not require a valid torrc when using the `--keygen` argument to generate a signing key. This allows us to generate keys on systems or users which may not run Tor. Fixes bug 40235; bugfix on 0.2.7.2-alpha. Patch by Neel Chauhan. o Minor bugfixes (logging, relay): - Emit a warning if an Address is found to be internal and tor can't use it. Fixes bug 40290; bugfix on 0.4.5.1-alpha. o Minor bugfixes (metrics port): - Fix a bug that made tor try to re-bind() on an already open MetricsPort every 60 seconds. Fixes bug 40370; bugfix on 0.4.5.1-alpha. o Minor bugfixes (onion services, logging): - Downgrade the severity of a few rendezvous circuit-related warnings from warning to info. Fixes bug 40207; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan. o Minor bugfixes (relay): - Reduce the compression level for data streaming from HIGH to LOW. This should reduce the CPU and memory burden for directory caches. Fixes bug 40301; bugfix on 0.3.5.1-alpha. o Minor bugfixes (testing, BSD): - Fix pattern-matching errors when patterns expand to invalid paths on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by Daniel Pinto. o Code simplification and refactoring: - Remove the orconn_ext_or_id_map structure and related functions. (Nothing outside of unit tests used them.) Closes ticket 33383. Patch by Neel Chauhan. o Removed features: - Remove unneeded code for parsing private keys in directory documents. This code was only used for client authentication in v2 onion services, which are now unsupported. Closes ticket 40374. - As of this release, Tor no longer supports the old v2 onion services. They were deprecated last July for security, and support will be removed entirely later this year. We strongly encourage everybody to migrate to v3 onion services. For more information, see https://blog.torproject.org/v2-deprecation-timeline . Closes ticket 40266. (NOTE: We accidentally released an earlier version of the 0.4.6.1-alpha changelog without this entry. Sorry for the confusion!) o Code simplification and refactoring (metrics, DoS): - Move the DoS subsystem into the subsys manager, including its configuration options. Closes ticket 40261. o Documentation (manual): - Move the ServerTransport* options to the "SERVER OPTIONS" section. Closes issue 40331. - Indicate that the HiddenServiceStatistics option also applies to bridges. Closes ticket 40346. - Move the description of BridgeRecordUsageByCountry to the section "STATISTICS OPTIONS". Closes ticket 40323. o Removed features (relay): - Because DirPorts are only used on authorities, relays no longer advertise them. Similarly, self-testing for DirPorts has been disabled, since an unreachable DirPort is no reason for a relay not to advertise itself. (Configuring a DirPort will still work, for now.) Closes ticket 40282.

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Tor 0.4.5.8 is released
by Nick Mathewson 10 May '21

10 May '21

Hello, everyone! (If you are about to reply saying "please take me off this list", instead please follow these instructions: https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-announce/ . If you have trouble, it is probably because you subscribed using a different address than the one you are trying to unsubscribe with. You will have to enter the actual email address you used when you subscribed.) Source code for Tor 0.4.5.8 is now available; you can download the source code from the download page at https://www.torproject.org/download/tor/. Packages should be available within the next several weeks, with a new Tor Browser likely next week. Today we're also releasing Tor 0.4.6.3-rc: since that one is not a stable release, it gets announced on tor-talk. Changes in version 0.4.5.8 - 2021-05-10 Tor 0.4.5.8 fixes several bugs in earlier version, backporting fixes from the 0.4.6.x series. o Minor features (compatibility, Linux seccomp sandbox, backport from 0.4.6.3-rc): - Add a workaround to enable the Linux sandbox to work correctly with Glibc 2.33. This version of Glibc has started using the fstatat() system call, which previously our sandbox did not allow. Closes ticket 40382; see the ticket for a discussion of trade-offs. o Minor features (compilation, backport from 0.4.6.3-rc): - Make the autoconf script build correctly with autoconf versions 2.70 and later. Closes part of ticket 40335. o Minor features (fallback directory list, backport from 0.4.6.2-alpha): - Regenerate the list of fallback directories to contain a new set of 200 relays. Closes ticket 40265. o Minor features (geoip data): - Update the geoip files to match the IPFire Location Database, as retrieved on 2021/05/07. o Minor features (onion services): - Add warning message when connecting to now deprecated v2 onion services. As announced, Tor 0.4.5.x is the last series that will support v2 onions. Closes ticket 40373. o Minor bugfixes (bridge, pluggable transport, backport from 0.4.6.2-alpha): - Fix a regression that made it impossible start Tor using a bridge line with a transport name and no fingerprint. Fixes bug 40360; bugfix on 0.4.5.4-rc. o Minor bugfixes (build, cross-compilation, backport from 0.4.6.3-rc): - Allow a custom "ar" for cross-compilation. Our previous build script had used the $AR environment variable in most places, but it missed one. Fixes bug 40369; bugfix on 0.4.5.1-alpha. o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha): - Fix a non-fatal BUG() message due to a too-early free of a string, when listing a client connection from the DoS defenses subsystem. Fixes bug 40345; bugfix on 0.4.3.4-rc. o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc): - Fix an indentation problem that led to a warning from GCC 11.1.1. Fixes bug 40380; bugfix on 0.3.0.1-alpha. o Minor bugfixes (controller, backport from 0.4.6.1-alpha): - Fix a "BUG" warning that would appear when a controller chooses the first hop for a circuit, and that circuit completes. Fixes bug 40285; bugfix on 0.3.2.1-alpha. o Minor bugfixes (onion service, client, memory leak, backport from 0.4.6.3-rc): - Fix a bug where an expired cached descriptor could get overwritten with a new one without freeing it, leading to a memory leak. Fixes bug 40356; bugfix on 0.3.5.1-alpha. o Minor bugfixes (testing, BSD, backport from 0.4.6.2-alpha): - Fix pattern-matching errors when patterns expand to invalid paths on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by Daniel Pinto.

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Tor Browser 10.0.16 is released
by Matthew Finkel 20 Apr '21

20 Apr '21

Hello! Tor Browser 10.0.16 for Desktop is now available from the Tor Browser download page [1] and also from our distribution directory [2]. 1: https://www.torproject.org/download/ 2: https://www.torproject.org/dist/torbrowser/10.0.16/ Tor Browser 10.0.16 updates Firefox to 78.10esr. In addition, this version updates NoScript to 11.2.4, and adds localization in Burmese. Please see the blog post [3] for more details about this version. 3: https://blog.torproject.org/new-release-tor-browser-10016 The full changelog since Tor Browser 10.0.15 is: * Windows + OS X + Linux * Update Firefox to 78.10.0esr * Update NoScript to 11.2.4 * Bug 40007: Update domain fronting config for Moat [tor-launcher] * Bug 40390: Add Burmese as a new locale [tor-browser] * Bug 40408: Disallow SVG Context Paint in all web content [tor-browser]

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Tor Browser 10.0.15 is released
by Matthew Finkel 27 Mar '21

27 Mar '21

Hello! Tor Browser 10.0.15 for Desktop is now available from the Tor Browser download page [1] and also from our distribution directory [2]. 1: https://www.torproject.org/download/ 2: https://www.torproject.org/dist/torbrowser/10.0.15/ Tor Browser 10.0.15 Openssl to 1.1.1k includes a bugfix for when Javascript is disabled on websites. Relay operators who use the Windows Expert Bundle are strongly encouraged to upgrade. Please see the blog post [3] for more details about this version. 3: https://blog.torproject.org/new-release-tor-browser-10015 The full changelog since Tor Browser 10.0.14 is: * Windows + OS X + Linux * Update Openssl to 1.1.1k * Bug 40030: Add 'noscript' capability to NoScript [torbutton]

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New stable Tor releases (with security fixes!): 0.3.5.14, 0.4.4.8, and 0.4.5.7
by Nick Mathewson 16 Mar '21

16 Mar '21

(If you are about to reply saying "please take me off this list", instead please follow these instructions: https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-announce/ . If you have trouble, it is probably because you subscribed using a different address than the one you are trying to unsubscribe with. You will have to enter the actual email address you used when you subscribed.) Source code for Tor 0.4.5.7 is now available; you can download the source code from the download page at https://www.torproject.org/download/tor/. Packages should be available within the next several weeks, with a new Tor Browser coming next week. Also today, Tor 0.3.5.14 and 0.4.4.8 have also been released; you can find them (and source for older Tor releases) at https://dist.torproject.org/ . Their changelogs are here: https://gitweb.torproject.org/tor.git/tree/ChangeLog?h=tor-0.3.5.14 https://gitweb.torproject.org/tor.git/tree/ChangeLog?h=tor-0.4.4.8 These releases fix a pair of denial-of-service issues, described below. One of these issues is authority-only. The other issue affects all Tor instances, and is most damaging on directory authorities and relays. Everybody should upgrade to one of these versions once packages are available. Changes in version 0.4.5.7 - 2021-03-16 Tor 0.4.5.7 fixes two important denial-of-service bugs in earlier versions of Tor. One of these vulnerabilities (TROVE-2021-001) would allow an attacker who can send directory data to a Tor instance to force that Tor instance to consume huge amounts of CPU. This is easiest to exploit against authorities, since anybody can upload to them, but directory caches could also exploit this vulnerability against relays or clients when they download. The other vulnerability (TROVE-2021-002) only affects directory authorities, and would allow an attacker to remotely crash the authority with an assertion failure. Patches have already been provided to the authority operators, to help ensure network stability. We recommend that everybody upgrade to one of the releases that fixes these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available to you. This release also updates our GeoIP data source, and fixes a few smaller bugs in earlier releases. o Major bugfixes (security, denial of service): - Disable the dump_desc() function that we used to dump unparseable information to disk. It was called incorrectly in several places, in a way that could lead to excessive CPU usage. Fixes bug 40286; bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021- 001 and CVE-2021-28089. - Fix a bug in appending detached signatures to a pending consensus document that could be used to crash a directory authority. Fixes bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002 and CVE-2021-28090. o Minor features (geoip data): - We have switched geoip data sources. Previously we shipped IP-to- country mappings from Maxmind's GeoLite2, but in 2019 they changed their licensing terms, so we were unable to update them after that point. We now ship geoip files based on the IPFire Location Database instead. (See https://location.ipfire.org/ for more information). This release updates our geoip files to match the IPFire Location Database as retrieved on 2021/03/12. Closes ticket 40224. o Minor bugfixes (directory authority): - Now that exit relays don't allow exit connections to directory authority DirPorts (to prevent network reentry), disable authorities' reachability self test on the DirPort. Fixes bug 40287; bugfix on 0.4.5.5-rc. o Minor bugfixes (documentation): - Fix a formatting error in the documentation for VirtualAddrNetworkIPv6. Fixes bug 40256; bugfix on 0.2.9.4-alpha. o Minor bugfixes (Linux, relay): - Fix a bug in determining total available system memory that would have been triggered if the format of Linux's /proc/meminfo file had ever changed to include "MemTotal:" in the middle of a line. Fixes bug 40315; bugfix on 0.2.5.4-alpha. o Minor bugfixes (metrics port): - Fix a BUG() warning on the MetricsPort for an internal missing handler. Fixes bug 40295; bugfix on 0.4.5.1-alpha. o Minor bugfixes (onion service): - Remove a harmless BUG() warning when reloading tor configured with onion services. Fixes bug 40334; bugfix on 0.4.5.1-alpha. o Minor bugfixes (portability): - Fix a non-portable usage of "==" with "test" in the configure script. Fixes bug 40298; bugfix on 0.4.5.1-alpha. o Minor bugfixes (relay): - Remove a spammy log notice falsely claiming that the IPv4/v6 address was missing. Fixes bug 40300; bugfix on 0.4.5.1-alpha. - Do not query the address cache early in the boot process when deciding if a relay needs to fetch early directory information from an authority. This bug resulted in a relay falsely believing it didn't have an address and thus triggering an authority fetch at each boot. Related to our fix for 40300. o Removed features (mallinfo deprecated): - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it. Closes ticket 40309.

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Tor Browser 10.0.13 (Linux Only) is released
by Matthew Finkel 03 Mar '21

03 Mar '21

Hello! Tor Browser 10.0.13 for Linux is now available from the Tor Browser download page [1] and also from our distribution directory [2]. 1: https://www.torproject.org/download/ 2: https://www.torproject.org/dist/torbrowser/10.0.13/ Tor Browser 10.0.13 fixes instability on some Linux distributions. Please see the blog post [3] for more details about this version. 3: https://blog.torproject.org/new-release-tor-browser-10013 The full changelog since Tor Browser 10.0.12 is: * Linux * Bug 40328: Fix instability after upgrading to glibc 2.33 [tor-browser]

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New stable Tor release: 0.4.5.6
by Nick Mathewson 15 Feb '21

15 Feb '21

Hello, everyone! (If you are about to reply saying "please take me off this list", instead please follow these instructions: https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-announce/ . If you have trouble, it is probably because you subscribed using a different address than the one you are trying to unsubscribe with. You will have to enter the actual email address you used when you subscribed.) After months of work, Tor 0.4.5.6 is now available! This is the first stable release in the 0.4.5.x series, and we hope you find it useful. You can download the source code from the download page at https://www.torproject.org/download/tor/ . Packages should be available within the next several weeks, with a new Tor Browser likely in a week or so. Changes in version 0.4.5.6 - 2021-02-15 The Tor 0.4.5.x release series is dedicated to the memory of Karsten Loesing (1979-2020), Tor developer, cypherpunk, husband, and father. Karsten is best known for creating the Tor metrics portal and leading the metrics team, but he was involved in Tor from the early days. For example, while he was still a student he invented and implemented the v2 onion service directory design, and he also served as an ambassador to the many German researchers working in the anonymity field. We loved him and respected him for his patience, his consistency, and his welcoming approach to growing our community. This release series introduces significant improvements in relay IPv6 address discovery, a new "MetricsPort" mechanism for relay operators to measure performance, LTTng support, build system improvements to help when using Tor as a static library, and significant bugfixes related to Windows relay performance. It also includes numerous smaller features and bugfixes. Below are the changes since 0.4.4.7. For a list of changes since 0.4.5.5-rc, see the ChangeLog file. o Major features (build): - When building Tor, first link all object files into a single static library. This may help with embedding Tor in other programs. Note that most Tor functions do not constitute a part of a stable or supported API: only those functions in tor_api.h should be used if embedding Tor. Closes ticket 40127. o Major features (metrics): - Introduce a new MetricsPort which exposes, through an HTTP interface, a series of metrics that tor collects at runtime. At the moment, the only supported output format is Prometheus data model. Closes ticket 40063. See the manual page for more information and security considerations. o Major features (relay, IPv6): - The torrc option Address now supports IPv6. This unifies our address discovery interface to support IPv4, IPv6, and hostnames. Closes ticket 33233. - Launch IPv4 and IPv6 ORPort self-test circuits on relays and bridges. Closes ticket 33222. - Relays now automatically bind on IPv6 for their ORPort, unless specified otherwise with the IPv4Only flag. Closes ticket 33246. - When a relay with IPv6 support is told to open a connection to another relay, and the extend cell lists both IPv4 and IPv6 addresses, the first relay now picks randomly which address to use. Closes ticket 33220. - Relays now track their IPv6 ORPort reachability separately from the reachability of their IPv4 ORPort. They will not publish a descriptor unless _both_ ports appear to be externally reachable. Closes ticket 34067. o Major features (tracing): - Add event-tracing library support for USDT and LTTng-UST, and a few tracepoints in the circuit subsystem. More will come incrementally. This feature is compiled out by default: it needs to be enabled at configure time. See documentation in doc/HACKING/Tracing.md. Closes ticket 32910. o Major bugfixes (directory cache, performance, windows): - Limit the number of items in the consensus diff cache to 64 on Windows. We hope this will mitigate an issue where Windows relay operators reported Tor using 100% CPU, while we investigate better solutions. Fixes bug 24857; bugfix on 0.3.1.1-alpha. o Major bugfixes (relay, windows): - Fix a bug in our implementation of condition variables on Windows. Previously, a relay on Windows would use 100% CPU after running for some time. Because of this change, Tor now require Windows Vista or later to build and run. Fixes bug 30187; bugfix on 0.2.6.3-alpha. (This bug became more serious in 0.3.1.1-alpha with the introduction of consensus diffs.) Patch by Daniel Pinto. o Major bugfixes (TLS, buffer): - When attempting to read N bytes on a TLS connection, really try to read all N bytes. Previously, Tor would stop reading after the first TLS record, which can be smaller than the N bytes requested, and not check for more data until the next mainloop event. Fixes bug 40006; bugfix on 0.1.0.5-rc. o Minor features (address discovery): - If no Address statements are found, relays now prioritize guessing their address by looking at the local interface instead of the local hostname. If the interface address can't be found, the local hostname is used. Closes ticket 33238. o Minor features (admin tools): - Add a new --format argument to -key-expiration option to allow specifying the time format of the expiration date. Adds Unix timestamp format support. Patch by Daniel Pinto. Closes ticket 30045. o Minor features (authority, logging): - Log more information for directory authority operators during the consensus voting process, and while processing relay descriptors. Closes ticket 40245. o Minor features (bootstrap reporting): - When reporting bootstrapping status on a relay, do not consider connections that have never been the target of an origin circuit. Previously, all connection failures were treated as potential bootstrapping failures, including connections that had been opened because of client requests. Closes ticket 25061. o Minor features (build): - When running the configure script, try to detect version mismatches between the OpenSSL headers and libraries, and suggest that the user should try "--with-openssl-dir". Closes 40138. - If the configure script has given any warnings, remind the user about them at the end of the script. Related to 40138. o Minor features (configuration): - Allow using wildcards (* and ?) with the %include option on configuration files. Closes ticket 25140. Patch by Daniel Pinto. - Allow the configuration options EntryNodes, ExcludeNodes, ExcludeExitNodes, ExitNodes, MiddleNodes, HSLayer2Nodes and HSLayer3Nodes to be specified multiple times. Closes ticket 28361. Patch by Daniel Pinto. o Minor features (control port): - Add a DROPTIMEOUTS command to drop circuit build timeout history and reset the current timeout. Closes ticket 40002. - When a stream enters the AP_CONN_STATE_CONTROLLER_WAIT status, send a control port event. Closes ticket 32190. Patch by Neel Chauhan. - Introduce GETINFO "stats/ntor/{assigned/requested}" and "stats/tap/{assigned/requested}" to get the NTor and TAP circuit onion handshake counts respectively. Closes ticket 28279. Patch by Neel Chauhan. o Minor features (control port, IPv6): - Tor relays now try to report to the controller when they are launching an IPv6 self-test. Closes ticket 34068. - Introduce "GETINFO address/v4" and "GETINFO address/v6" in the control port to fetch the Tor host's respective IPv4 or IPv6 address. We keep "GETINFO address" for backwards-compatibility. Closes ticket 40039. Patch by Neel Chauhan. o Minor features (directory authorities): - Add a new consensus method 30 that removes the unnecessary "=" padding from ntor-onion-key. Closes ticket 7869. Patch by Daniel Pinto. - Directory authorities now reject descriptors from relays running Tor versions from the obsolete 0.4.1 series. Resolves ticket 34357. Patch by Neel Chauhan. - The AssumeReachable option no longer stops directory authorities from checking whether other relays are running. A new AuthDirTestReachability option can be used to disable these checks. Closes ticket 34445. - When looking for possible Sybil attacks, also consider IPv6 addresses. Two routers are considered to have "the same" address by this metric if they are in the same /64 network. Patch from Maurice Pibouin. Closes ticket 7193. o Minor features (directory authorities, IPv6): - Make authorities add their IPv6 ORPort (if any) to the trusted servers list. Authorities previously added only their IPv4 addresses. Closes ticket 32822. o Minor features (documentation): - Mention the "!badexit" directive that can appear in an authority's approved-routers file, and update the description of the "!invalid" directive. Closes ticket 40188. o Minor features (ed25519, relay): - Save a relay's base64-encoded ed25519 identity key to the data directory in a file named fingerprint-ed25519. Closes ticket 30642. Patch by Neel Chauhan. o Minor features (heartbeat): - Include the total number of inbound and outbound IPv4 and IPv6 connections in the heartbeat message. Closes ticket 29113. o Minor features (IPv6, ExcludeNodes): - Handle IPv6 addresses in ExcludeNodes; previously they were ignored. Closes ticket 34065. Patch by Neel Chauhan. o Minor features (logging): - Add the running glibc version to the log, and the compiled glibc version to the library list returned when using --library-versions. Patch from Daniel Pinto. Closes ticket 40047. - Consider an HTTP 301 response to be an error (like a 404) when processing a directory response. Closes ticket 40053. - Log directory fetch statistics as a single line. Closes ticket 40159. - Provide more complete descriptions of our connections when logging about them. Closes ticket 40041. - When describing a relay in the logs, we now include its ed25519 identity. Closes ticket 22668. o Minor features (onion services): - Only overwrite an onion service's existing hostname file if its contents are wrong. This enables read-only onion-service directories. Resolves ticket 40062. Patch by Neel Chauhan. o Minor features (pluggable transports): - Add an OutboundBindAddressPT option to allow users to specify which IPv4 and IPv6 address pluggable transports should use for outgoing IP packets. Tor does not have a way to enforce that the pluggable transport honors this option, so each pluggable transport needs to implement support on its own. Closes ticket 5304. o Minor features (protocol, proxy support, defense in depth): - Respond more deliberately to misbehaving proxies that leave leftover data on their connections, so as to make Tor even less likely to allow the proxies to pass their data off as having come from a relay. Closes ticket 40017. o Minor features (relay address tracking): - We now store relay addresses for OR connections in a more logical way. Previously we would sometimes overwrite the actual address of a connection with a "canonical address", and then store the "real address" elsewhere to remember it. We now track the "canonical address" elsewhere for the cases where we need it, and leave the connection's address alone. Closes ticket 33898. o Minor features (relay): - If a relay is unable to discover its address, attempt to learn it from the NETINFO cell. Closes ticket 40022. - Log immediately when launching a relay self-check. Previously we would try to log before launching checks, or approximately when we intended to launch checks, but this tended to be error-prone. Closes ticket 34137. o Minor features (relay, address discovery): - If Address option is not found in torrc, attempt to learn our address with the configured ORPort address if any. Closes ticket 33236. o Minor features (relay, IPv6): - Add an AssumeReachableIPv6 option to disable self-checking IPv6 reachability. Closes part of ticket 33224. - Add new "assume-reachable" and "assume-reachable-ipv6" consensus parameters to be used in an emergency to tell relays that they should publish even if they cannot complete their ORPort self- checks. Closes ticket 34064 and part of 33224. - Allow relays to send IPv6-only extend cells. Closes ticket 33222. - Declare support for the Relay=3 subprotocol version. Closes ticket 33226. - When launching IPv6 ORPort self-test circuits, make sure that the second-last hop can initiate an IPv6 extend. Closes ticket 33222. o Minor features (safety): - Log a warning at startup if Tor is built with compile-time options that are likely to make it less stable or reliable. Closes ticket 18888. o Minor features (specification update): - Several fields in microdescriptors, router descriptors, and consensus documents that were formerly optional are now required. Implements proposal 315; closes ticket 40132. o Minor features (state management): - When loading the state file, remove entries from the statefile that have been obsolete for a long time. Ordinarily Tor preserves unrecognized entries in order to keep forward-compatibility, but these entries have not actually been used in any release since before 0.3.5.x. Closes ticket 40137. o Minor features (statistics, ipv6): - Relays now publish IPv6-specific counts of single-direction versus bidirectional relay connections. Closes ticket 33264. - Relays now publish their IPv6 read and write statistics over time, if statistics are enabled. Closes ticket 33263. o Minor features (subprotocol versions): - Use the new limitations on subprotocol versions due to proposal 318 to simplify our implementation. Part of ticket 40133. o Minor features (testing configuration): - The TestingTorNetwork option no longer implicitly sets AssumeReachable to 1. This change allows us to test relays' self- testing mechanisms, and to test authorities' relay-testing functionality. Closes ticket 34446. o Minor features (testing): - Added unit tests for channel_matches_target_addr_for_extend(). Closes Ticket 33919. Patch by MrSquanchee. o Minor bugfixes (circuit padding): - When circpad_send_padding_cell_for_callback is called, `is_padding_timer_scheduled` flag was not reset. Now it is set to 0 at the top of that function. Fixes bug 32671; bugfix on 0.4.0.1-alpha. - Add a per-circuit padding machine instance counter, so we can differentiate between shutdown requests for old machines on a circuit. Fixes bug 30992; bugfix on 0.4.1.1-alpha. - Add the ability to keep circuit padding machines if they match a set of circuit states or purposes. This allows us to have machines that start up under some conditions but don't shut down under others. We now use this mask to avoid starting up introduction circuit padding again after the machines have already completed. Fixes bug 32040; bugfix on 0.4.1.1-alpha. o Minor bugfixes (circuit, handshake): - In the v3 handshaking code, use connection_or_change_state() to change the state. Previously, we changed the state directly, but this did not pass the state change to the pubsub or channel objects, potentially leading to bugs. Fixes bug 32880; bugfix on 0.2.3.6-alpha. Patch by Neel Chauhan. o Minor bugfixes (compilation): - Change the linker flag ordering in our library search code so that it works for compilers that need the libraries to be listed in the right order. Fixes bug 33624; bugfix on 0.1.1.0-alpha. - Fix the "--enable-static-tor" switch to properly set the "-static" compile option onto the tor binary only. Fixes bug 40111; bugfix on 0.2.3.1-alpha. o Minor bugfixes (configuration): - Exit Tor on a misconfiguration when the Bridge line is configured to use a transport but no corresponding ClientTransportPlugin can be found. Prior to this fix, Tor would attempt to connect to the bridge directly without using the transport, making it easier for adversaries to notice the bridge. Fixes bug 25528; bugfix on 0.2.6.1-alpha. o Minor bugfixes (control port): - Make sure we send the SOCKS request address in relay begin cells when a stream is attached with the purpose CIRCUIT_PURPOSE_CONTROLLER. Fixes bug 33124; bugfix on 0.0.5. Patch by Neel Chauhan. o Minor bugfixes (crash, relay, signing key): - Avoid assertion failures when we run Tor from the command line with `--key-expiration sign`, but an ORPort is not set. Fixes bug 40015; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan. o Minor bugfixes (logging): - Avoid a spurious log message about missing subprotocol versions, when the consensus that we're reading from is older than the current release. Previously we had made this message nonfatal, but in practice, it is never relevant when the consensus is older than the current release. Fixes bug 40281; bugfix on 0.4.0.1-alpha. - Remove trailing whitespace from control event log messages. Fixes bug 32178; bugfix on 0.1.1.1-alpha. Based on a patch by Amadeusz Pawlik. - Turn warning-level log message about SENDME failure into a debug- level message. (This event can happen naturally, and is no reason for concern). Fixes bug 40142; bugfix on 0.4.1.1-alpha. - When logging a rate-limited message about how many messages have been suppressed in the last N seconds, give an accurate value for N, rounded up to the nearest minute. Previously we would report the size of the rate-limiting interval, regardless of when the messages started to occur. Fixes bug 19431; bugfix on 0.2.2.16-alpha. o Minor bugfixes (onion services): - Avoid a non-fatal assertion in certain edge-cases when establishing a circuit to an onion service. Fixes bug 32666; bugfix on 0.3.0.3-alpha. o Minor bugfixes (rust, protocol versions): - Declare support for the onion service introduction point denial of service extensions when building with Rust. Fixes bug 34248; bugfix on 0.4.2.1-alpha. - Make Rust protocol version support checks consistent with the undocumented error behavior of the corresponding C code. Fixes bug 34251; bugfix on 0.3.3.5-rc. o Minor bugfixes (self-testing): - When receiving an incoming circuit, only accept it as evidence that we are reachable if the declared address of its channel is the same address we think that we have. Otherwise, it could be evidence that we're reachable on some other address. Fixes bug 20165; bugfix on 0.1.0.1-rc. o Minor bugfixes (spec conformance): - Use the correct key type when generating signing->link certificates. Fixes bug 40124; bugfix on 0.2.7.2-alpha. o Minor bugfixes (subprotocol versions): - Consistently reject extra commas, instead of only rejecting leading commas. Fixes bug 27194; bugfix on 0.2.9.4-alpha. - In summarize_protover_flags(), treat empty strings the same as NULL. This prevents protocols_known from being set. Previously, we treated empty strings as normal strings, which led to protocols_known being set. Fixes bug 34232; bugfix on 0.3.3.2-alpha. Patch by Neel Chauhan. o Code simplification and refactoring: - Add and use a set of functions to perform down-casts on constant connection and channel pointers. Closes ticket 40046. - Refactor our code that logs descriptions of connections, channels, and the peers on them, to use a single call path. This change enables us to refactor the data types that they use, and eliminates many confusing usages of those types. Closes ticket 40041. - Refactor some common node selection code into a single function. Closes ticket 34200. - Remove the now-redundant 'outbuf_flushlen' field from our connection type. It was previously used for an older version of our rate-limiting logic. Closes ticket 33097. - Rename "fascist_firewall_*" identifiers to "reachable_addr_*" instead, for consistency with other code. Closes ticket 18106. - Rename functions about "advertised" ports which are not in fact guaranteed to return the ports that have been advertised. Closes ticket 40055. - Split implementation of several command line options from options_init_from_torrc into smaller isolated functions. Patch by Daniel Pinto. Closes ticket 40102. - When an extend cell is missing an IPv4 or IPv6 address, fill in the address from the extend info. This is similar to what was done in ticket 33633 for ed25519 keys. Closes ticket 33816. Patch by Neel Chauhan. o Deprecated features: - The "non-builtin" argument to the "--dump-config" command is now deprecated. When it works, it behaves the same as "short", which you should use instead. Closes ticket 33398. o Documentation: - Replace URLs from our old bugtracker so that they refer to the new bugtracker and wiki. Closes ticket 40101. o Removed features: - We no longer ship or build a "tor.service" file for use with systemd. No distribution included this script unmodified, and we don't have the expertise ourselves to maintain this in a way that all the various systemd-based distributions can use. Closes ticket 30797. - We no longer ship support for the Android logging API. Modern versions of Android can use the syslog API instead. Closes ticket 32181. - The "optimistic data" feature is now always on; there is no longer an option to disable it from the torrc file or from the consensus directory. Closes part of 40139. - The "usecreatefast" network parameter is now removed; there is no longer an option for authorities to turn it off. Closes part of 40139. o Testing: - Add unit tests for bandwidth statistics manipulation functions. Closes ticket 33812. Patch by MrSquanchee. o Code simplification and refactoring (autoconf): - Remove autoconf checks for unused funcs and headers. Closes ticket 31699; Patch by @bduszel o Code simplification and refactoring (maintainer scripts): - Disable by default the pre-commit hook. Use the environment variable TOR_EXTRA_PRE_COMMIT_CHECKS in order to run it. Furthermore, stop running practracker in the pre-commit hook and make check-local. Closes ticket 40019. o Code simplification and refactoring (relay address): - Most of IPv4 representation was using "uint32_t". It has now been moved to use the internal "tor_addr_t" interface instead. This is so we can properly integrate IPv6 along IPv4 with common interfaces. Closes ticket 40043. o Documentation (manual page): - Move them from doc/ to doc/man/. Closes ticket 40044. - Describe the status of the "Sandbox" option more accurately. It is no longer "experimental", but it _is_ dependent on kernel and libc versions. Closes ticket 23378. o Documentation (tracing): - Document in depth the circuit subsystem trace events in the new doc/tracing/EventsCircuit.md. Closes ticket 40036. o Removed features (controller): - Remove the "GETINFO network-status" controller command. It has been deprecated since 0.3.1.1-alpha. Closes ticket 22473.

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Tor Browser 10.0.10 is released
by Matthew Finkel 04 Feb '21

04 Feb '21

Hello! Tor Browser 10.0.10 is now available from the Tor Browser download page [1] and also from our distribution directory [2]. 1: https://www.torproject.org/download/ 2: https://www.torproject.org/dist/torbrowser/10.0.10/ Tor Browser 10.0.10 backports increases the availability of version 3 (v3) onion services. The fix is included in the recently released stable tor versions, as well. Please see the blog post [3] for more details about this version. 3: https://blog.torproject.org/new-release-tor-browser-10010 The full changelog since Tor Browser 10.0.9 is: * All Platforms * Update NoScript to 11.2 * Update HTTPS Everywhere to 2021.1.27 * Bug 40224: Backport Tor patch for v3 onion services [tor-browser-build] * Android * Pick up fix for Mozilla's bug 1688783 * Pick up fix for Mozilla's bug 1688017

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New stable Tor releases: 0.3.5.13, 0.4.3.8, and 0.4.4.7
by Nick Mathewson 03 Feb '21

03 Feb '21

(If you are about to reply saying "please take me off this list", instead please follow these instructions: https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-announce/ . If you have trouble, it is probably because you subscribed using a different address than the one you are trying to unsubscribe with. You will have to enter the actual email address you used when you subscribed.) Source code for Tor 0.4.4.7 is now available; you can download the source code from the download page at https://www.torproject.org/download/tor/. Packages should be available within the next several weeks, with a new Tor Browser coming later this month. Also today, Tor 0.3.5.13 and 0.4.3.8 have also been released; you can find them (and source for older Tor releases) at https://dist.torproject.org/ . Their changelogs are here: https://gitweb.torproject.org/tor.git/tree/ChangeLog?h=tor-0.3.5.13 https://gitweb.torproject.org/tor.git/tree/ChangeLog?h=tor-0.4.3.8 Note that the 0.4.3.x series is almost at end-of-life: it will no longer get supported after 15 Feb. Changes in version 0.4.4.7 - 2021-02-03 Tor 0.4.4.7 backports numerous bugfixes from later releases, including one that made v3 onion services more susceptible to denial-of-service attacks, and a feature that makes some kinds of DoS attacks harder to perform. o Major bugfixes (onion service v3, backport from 0.4.5.3-rc): - Stop requiring a live consensus for v3 clients and services, and allow a "reasonably live" consensus instead. This allows v3 onion services to work even if the authorities fail to generate a consensus for more than 2 hours in a row. Fixes bug 40237; bugfix on 0.3.5.1-alpha. o Major feature (exit, backport from 0.4.5.5-rc): - Re-entry into the network is now denied at the Exit level to all relays' ORPorts and authorities' ORPorts and DirPorts. This change should help mitgate a set of denial-of-service attacks. Closes ticket 2667. o Minor feature (build system, backport from 0.4.5.4-rc): - New "make lsp" command to generate the compile_commands.json file used by the ccls language server. The "bear" program is needed for this. Closes ticket 40227. o Minor features (compilation, backport from 0.4.5.2-rc): - Disable deprecation warnings when building with OpenSSL 3.0.0 or later. There are a number of APIs newly deprecated in OpenSSL 3.0.0 that Tor still requires. (A later version of Tor will try to stop depending on these APIs.) Closes ticket 40165. o Minor features (crypto, backport from 0.4.5.3-rc): - Fix undefined behavior on our Keccak library. The bug only appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel) and would result in wrong digests. Fixes bug 40210; bugfix on 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and weasel for diagnosing this. o Minor bugfixes (compatibility, backport from 0.4.5.1-rc): - Strip '\r' characters when reading text files on Unix platforms. This should resolve an issue where a relay operator migrates a relay from Windows to Unix, but does not change the line ending of Tor's various state files to match the platform, and the CRLF line endings from Windows end up leaking into other files such as the extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5. o Minor bugfixes (compilation, backport from 0.4.5.3-rc): - Fix a compilation warning about unreachable fallthrough annotations when building with "--enable-all-bugs-are-fatal" on some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha. o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc): - Handle partial SOCKS5 messages correctly. Previously, our code would send an incorrect error message if it got a SOCKS5 request that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha. o Minor bugfixes (testing, backport from 0.4.5.2-alpha): - Fix the `config/parse_tcp_proxy_line` test so that it works correctly on systems where the DNS provider hijacks invalid queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha. - Fix our Python reference-implementation for the v3 onion service handshake so that it works correctly with the version of hashlib provided by Python 3.9. Fixes part of bug 40179; bugfix on 0.3.1.6-rc. - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.

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