tor-announce

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June 2012

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Tor 0.2.2.37 is released
by Roger Dingledine 13 Jun '12

13 Jun '12

Tor 0.2.2.37 introduces a workaround for a critical renegotiation bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself currently). https://www.torproject.org/download/download Changes in version 0.2.2.37 - 2012-06-06 o Major bugfixes: - Work around a bug in OpenSSL that broke renegotiation with TLS 1.1 and TLS 1.2. Without this workaround, all attempts to speak the v2 Tor connection protocol when both sides were using OpenSSL 1.0.1 would fail. Resolves ticket 6033. - When waiting for a client to renegotiate, don't allow it to add any bytes to the input buffer. This fixes a potential DoS issue. Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc. - Fix an edge case where if we fetch or publish a hidden service descriptor, we might build a 4-hop circuit and then use that circuit for exiting afterwards -- even if the new last hop doesn't obey our ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha. o Minor bugfixes: - Fix a build warning with Clang 3.1 related to our use of vasprintf. Fixes bug 5969. Bugfix on 0.2.2.11-alpha. o Minor features: - Tell GCC and Clang to check for any errors in format strings passed to the tor_v*(print|scan)f functions.

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Tor 0.2.2.36 is released
by Roger Dingledine 05 Jun '12

05 Jun '12

Tor 0.2.2.36 updates the addresses for two of the eight directory authorities, fixes some potential anonymity and security issues, and fixes several crash bugs. We're going to be following it soon with 0.2.2.37, which works around a bug in OpenSSL's TLS renegotiation (currently being tested in the Tor 0.2.3.16-alpha release). Stay tuned. Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many known flaws, and nobody should be using them. You should upgrade. If you're using a Linux or BSD and its packages are obsolete, stop using those packages and upgrade anyway. https://www.torproject.org/download/download Changes in version 0.2.2.36 - 2012-05-24 o Directory authority changes: - Change IP address for maatuska (v3 directory authority). - Change IP address for ides (v3 directory authority), and rename it to turtles. o Security fixes: - When building or running with any version of OpenSSL earlier than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL versions have a bug (CVE-2011-4576) in which their block cipher padding includes uninitialized data, potentially leaking sensitive information to any peer with whom they make a SSLv3 connection. Tor does not use SSL v3 by default, but a hostile client or server could force an SSLv3 connection in order to gain information that they shouldn't have been able to get. The best solution here is to upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building or running with a non-upgraded OpenSSL, we disable SSLv3 entirely to make sure that the bug can't happen. - Never use a bridge or a controller-supplied node as an exit, even if its exit policy allows it. Found by wanoskarnet. Fixes bug 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors) and 0.2.0.3-alpha (for bridge-purpose descriptors). - Only build circuits if we have a sufficient threshold of the total descriptors that are marked in the consensus with the "Exit" flag. This mitigates an attack proposed by wanoskarnet, in which all of a client's bridges collude to restrict the exit nodes that the client knows about. Fixes bug 5343. - Provide controllers with a safer way to implement the cookie authentication mechanism. With the old method, if another locally running program could convince a controller that it was the Tor process, then that program could trick the controller into telling it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE" authentication method uses a challenge-response approach to prevent this attack. Fixes bug 5185; implements proposal 193. o Major bugfixes: - Avoid logging uninitialized data when unable to decode a hidden service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha. - Avoid a client-side assertion failure when receiving an INTRODUCE2 cell on a general purpose circuit. Fixes bug 5644; bugfix on 0.2.1.6-alpha. - Fix builds when the path to sed, openssl, or sha1sum contains spaces, which is pretty common on Windows. Fixes bug 5065; bugfix on 0.2.2.1-alpha. - Correct our replacements for the timeradd() and timersub() functions on platforms that lack them (for example, Windows). The timersub() function is used when expiring circuits, while timeradd() is currently unused. Bug report and patch by Vektor. Fixes bug 4778; bugfix on 0.2.2.24-alpha. - Fix the SOCKET_OK test that we use to tell when socket creation fails so that it works on Win64. Fixes part of bug 4533; bugfix on 0.2.2.29-beta. Bug found by wanoskarnet. o Minor bugfixes: - Reject out-of-range times like 23:59:61 in parse_rfc1123_time(). Fixes bug 5346; bugfix on 0.0.8pre3. - Make our number-parsing functions always treat too-large values as an error, even when those values exceed the width of the underlying type. Previously, if the caller provided these functions with minima or maxima set to the extreme values of the underlying integer type, these functions would return those values on overflow rather than treating overflow as an error. Fixes part of bug 5786; bugfix on 0.0.9. - Older Linux kernels erroneously respond to strange nmap behavior by having accept() return successfully with a zero-length socket. When this happens, just close the connection. Previously, we would try harder to learn the remote address: but there was no such remote address to learn, and our method for trying to learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix on 0.1.0.3-rc. Reported and diagnosed by "r1eo". - Correct parsing of certain date types in parse_http_time(). Without this patch, If-Modified-Since would behave incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from Esteban Manchado VelÃ¡zques. - Change the BridgePassword feature (part of the "bridge community" design, which is not yet implemented) to use a time-independent comparison. The old behavior might have allowed an adversary to use timing to guess the BridgePassword value. Fixes bug 5543; bugfix on 0.2.0.14-alpha. - Detect and reject certain misformed escape sequences in configuration values. Previously, these values would cause us to crash if received in a torrc file or over an authenticated control port. Bug found by Esteban Manchado VelÃ¡zquez, and independently by Robert Connolly from Matta Consulting who further noted that it allows a post-authentication heap overflow. Patch by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668); bugfix on 0.2.0.16-alpha. - Fix a compile warning when using the --enable-openbsd-malloc configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc. - During configure, detect when we're building with clang version 3.0 or lower and disable the -Wnormalized=id and -Woverride-init CFLAGS. clang doesn't support them yet. - When sending an HTTP/1.1 proxy request, include a Host header. Fixes bug 5593; bugfix on 0.2.2.1-alpha. - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha. - If we hit the error case where routerlist_insert() replaces an existing (old) server descriptor, make sure to remove that server descriptor from the old_routers list. Fix related to bug 1776. Bugfix on 0.2.2.18-alpha. o Minor bugfixes (documentation and log messages): - Fix a typo in a log message in rend_service_rendezvous_has_opened(). Fixes bug 4856; bugfix on Tor 0.0.6. - Update "ClientOnly" man page entry to explain that there isn't really any point to messing with it. Resolves ticket 5005. - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays directory authority option (introduced in Tor 0.2.2.34). - Downgrade the "We're missing a certificate" message from notice to info: people kept mistaking it for a real problem, whereas it is seldom the problem even when we are failing to bootstrap. Fixes bug 5067; bugfix on 0.2.0.10-alpha. - Correctly spell "connect" in a log message on failure to create a controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta. - Clarify the behavior of MaxCircuitDirtiness with hidden service circuits. Fixes issue 5259. o Minor features: - Directory authorities now reject versions of Tor older than 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha inclusive. These versions accounted for only a small fraction of the Tor network, and have numerous known security issues. Resolves issue 4788. - Update to the May 1 2012 Maxmind GeoLite Country database. - Feature removal: - When sending or relaying a RELAY_EARLY cell, we used to convert it to a RELAY cell if the connection was using the v1 link protocol. This was a workaround for older versions of Tor, which didn't handle RELAY_EARLY cells properly. Now that all supported versions can handle RELAY_EARLY cells, and now that we're enforcing the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule, remove this workaround. Addresses bug 4786.

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