Hello!

Source code for a new Tor release (0.3.0.8) is now available on the website. Among other things, it fixes two issues in earlier versions of the hidden service code that would allow an attacker to cause a hidden service to exit with an assertion failure.

If you're running a hidden service, you should upgrade to this release, or one of the other versions released today. Source is available on the website now; packages should be available over the next several days.

Concurrently with 0.3.0.8, the following versions are also now available: 0.2.4.29, 0.2.5.14, 0.2.6.12, 0.2.7.8, 0.2.8.14, and 0.2.9.11. You can find them all at https://dist.torproject.org/

One last reminder: Tor 0.2.4, 0.2.6, and 0.2.7 will no longer be supported after 1 August of this year. Tor 0.2.8 will not be supported after 1 Jan of 2018. Tor 0.2.5 will not be supported after 1 May of 2018. If you need a release with long-term support, 0.2.9 is what we recommend: we plan to support it until at least 1 Jan 2020.

Below are the changelogs for the new stable releases:

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Changes in version 0.3.0.8 - 2017-06-08 Tor 0.3.0.8 fixes a pair of bugs that would allow an attacker to remotely crash a hidden service with an assertion failure. Anyone running a hidden service should upgrade to this version, or to some other version with fixes for TROVE-2017-004 and TROVE-2017-005.

Tor 0.3.0.8 also includes fixes for several key management bugs that sometimes made relays unreliable, as well as several other bugfixes described below.

o Major bugfixes (hidden service, relay, security, backport from 0.3.1.3-alpha): - Fix a remotely triggerable assertion failure when a hidden service handles a malformed BEGIN cell. Fixes bug 22493, tracked as TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha. - Fix a remotely triggerable assertion failure caused by receiving a BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix on 0.2.2.1-alpha.

o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha): - When performing the v3 link handshake on a TLS connection, report that we have the x509 certificate that we actually used on that connection, even if we have changed certificates since that connection was first opened. Previously, we would claim to have used our most recent x509 link certificate, which would sometimes make the link handshake fail. Fixes one case of bug 22460; bugfix on 0.2.3.6-alpha.

o Major bugfixes (relays, key management, backport from 0.3.1.3-alpha): - Regenerate link and authentication certificates whenever the key that signs them changes; also, regenerate link certificates whenever the signed key changes. Previously, these processes were only weakly coupled, and we relays could (for minutes to hours) wind up with an inconsistent set of keys and certificates, which other relays would not accept. Fixes two cases of bug 22460; bugfix on 0.3.0.1-alpha. - When sending an Ed25519 signing->link certificate in a CERTS cell, send the certificate that matches the x509 certificate that we used on the TLS connection. Previously, there was a race condition if the TLS context rotated after we began the TLS handshake but before we sent the CERTS cell. Fixes a case of bug 22460; bugfix on 0.3.0.1-alpha.

o Major bugfixes (hidden service v3, backport from 0.3.1.1-alpha): - Stop rejecting v3 hidden service descriptors because their size did not match an old padding rule. Fixes bug 22447; bugfix on tor-0.3.0.1-alpha.

o Minor features (fallback directory list, backport from 0.3.1.3-alpha): - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in December 2016 (of which ~126 were still functional) with a list of 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May 2017. Resolves ticket 21564.

o Minor bugfixes (configuration, backport from 0.3.1.1-alpha): - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes bug 22252; bugfix on 0.2.9.3-alpha.

o Minor bugfixes (correctness, backport from 0.3.1.3-alpha): - Avoid undefined behavior when parsing IPv6 entries from the geoip6 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.

o Minor bugfixes (link handshake, backport from 0.3.1.3-alpha): - Lower the lifetime of the RSA->Ed25519 cross-certificate to six months, and regenerate it when it is within one month of expiring. Previously, we had generated this certificate at startup with a ten-year lifetime, but that could lead to weird behavior when Tor was started with a grossly inaccurate clock. Mitigates bug 22466; mitigation on 0.3.0.1-alpha.

o Minor bugfixes (memory leak, directory authority, backport from 0.3.1.2-alpha): - When directory authorities reject a router descriptor due to keypinning, free the router descriptor rather than leaking the memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.

Changes in version 0.2.9.11 - 2017-06-08 Tor 0.2.9.11 backports a fix for a bug that would allow an attacker to remotely crash a hidden service with an assertion failure. Anyone running a hidden service should upgrade to this version, or to some other version with fixes for TROVE-2017-005. (Versions before 0.3.0 are not affected by TROVE-2017-004.)

Tor 0.2.9.11 also backports fixes for several key management bugs that sometimes made relays unreliable, as well as several other bugfixes described below.

o Major bugfixes (hidden service, relay, security, backport from 0.3.1.3-alpha): - Fix a remotely triggerable assertion failure caused by receiving a BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix on 0.2.2.1-alpha.

o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha): - When performing the v3 link handshake on a TLS connection, report that we have the x509 certificate that we actually used on that connection, even if we have changed certificates since that connection was first opened. Previously, we would claim to have used our most recent x509 link certificate, which would sometimes make the link handshake fail. Fixes one case of bug 22460; bugfix on 0.2.3.6-alpha.

o Minor features (fallback directory list, backport from 0.3.1.3-alpha): - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in December 2016 (of which ~126 were still functional) with a list of 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May 2017. Resolves ticket 21564.

o Minor features (future-proofing, backport from 0.3.0.7): - Tor no longer refuses to download microdescriptors or descriptors if they are listed as "published in the future". This change will eventually allow us to stop listing meaningful "published" dates in microdescriptor consensuses, and thereby allow us to reduce the resources required to download consensus diffs by over 50%. Implements part of ticket 21642; implements part of proposal 275.

o Minor features (directory authorities, backport from 0.3.0.4-rc) - Directory authorities now reject relays running versions 0.2.9.1-alpha through 0.2.9.4-alpha, because those relays suffer from bug 20499 and don't keep their consensus cache up-to-date. Resolves ticket 20509.

o Minor features (geoip): - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2 Country database.

o Minor bugfixes (control port, backport from 0.3.0.6): - The GETINFO extra-info/digest/<digest> command was broken because of a wrong base16 decode return value check, introduced when refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.

o Minor bugfixes (correctness, backport from 0.3.1.3-alpha): - Avoid undefined behavior when parsing IPv6 entries from the geoip6 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.

o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.0.7): - The getpid() system call is now permitted under the Linux seccomp2 sandbox, to avoid crashing with versions of OpenSSL (and other libraries) that attempt to learn the process's PID by using the syscall rather than the VDSO code. Fixes bug 21943; bugfix on 0.2.5.1-alpha.

o Minor bugfixes (memory leak, directory authority, backport from 0.3.1.2-alpha): - When directory authorities reject a router descriptor due to keypinning, free the router descriptor rather than leaking the memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.

Changes in version 0.2.8.14 - 2017-06-08 Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to remotely crash a hidden service with an assertion failure. Anyone running a hidden service should upgrade to this version, or to some other version with fixes for TROVE-2017-005. (Versions before 0.3.0 are not affected by TROVE-2017-004.)

o Major bugfixes (hidden service, relay, security): - Fix a remotely triggerable assertion failure caused by receiving a BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix on 0.2.2.1-alpha.

o Minor features (geoip): - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2 Country database.

o Minor features (fallback directory list, backport from 0.3.1.3-alpha): - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in December 2016 (of which ~126 were still functional) with a list of 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May 2017. Resolves ticket 21564.

o Minor bugfixes (correctness): - Avoid undefined behavior when parsing IPv6 entries from the geoip6 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.

Changes in version 0.2.7.8 - 2017-06-08 Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to remotely crash a hidden service with an assertion failure. Anyone running a hidden service should upgrade to this version, or to some other version with fixes for TROVE-2017-005. (Versions before 0.3.0 are not affected by TROVE-2017-004.)

o Major bugfixes (hidden service, relay, security): - Fix a remotely triggerable assertion failure caused by receiving a BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix on 0.2.2.1-alpha.

o Minor features (geoip): - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2 Country database.

o Minor bugfixes (correctness): - Avoid undefined behavior when parsing IPv6 entries from the geoip6 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.

Changes in version 0.2.6.12 - 2017-06-08 Tor 0.2.6.12 backports a fix for a bug that would allow an attacker to remotely crash a hidden service with an assertion failure. Anyone running a hidden service should upgrade to this version, or to some other version with fixes for TROVE-2017-005. (Versions before 0.3.0 are not affected by TROVE-2017-004.)

o Major bugfixes (hidden service, relay, security): - Fix a remotely triggerable assertion failure caused by receiving a BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix on 0.2.2.1-alpha.

o Minor features (geoip): - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2 Country database.

o Minor bugfixes (correctness): - Avoid undefined behavior when parsing IPv6 entries from the geoip6 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.

Changes in version 0.2.5.14 - 2017-06-08 Tor 0.2.5.14 backports a fix for a bug that would allow an attacker to remotely crash a hidden service with an assertion failure. Anyone running a hidden service should upgrade to this version, or to some other version with fixes for TROVE-2017-005. (Versions before 0.3.0 are not affected by TROVE-2017-004.)

o Major bugfixes (hidden service, relay, security): - Fix a remotely triggerable assertion failure caused by receiving a BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix on 0.2.2.1-alpha.

o Minor features (geoip): - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2 Country database.

o Minor bugfixes (correctness): - Avoid undefined behavior when parsing IPv6 entries from the geoip6 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.

Changes in version 0.2.4.29 - 2017-06-08 Tor 0.2.4.29 backports a fix for a bug that would allow an attacker to remotely crash a hidden service with an assertion failure. Anyone running a hidden service should upgrade to this version, or to some other version with fixes for TROVE-2017-005. (Versions before 0.3.0 are not affected by TROVE-2017-004.)

o Major bugfixes (hidden service, relay, security): - Fix a remotely triggerable assertion failure caused by receiving a BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix on 0.2.2.1-alpha.

o Minor features (geoip): - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2 Country database.

o Minor bugfixes (correctness): - Avoid undefined behavior when parsing IPv6 entries from the geoip6 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.