Tor 0.2.9.10 is released

Tor 0.2.9.10 backports a security fix for users who build Tor with the --enable-expensive-hardening option. It also includes fixes for some major issues affecting directory authorities, LibreSSL compatibility, and IPv6 correctness.
The Tor 0.2.9.x release series is now marked as a long-term-support series. We intend to backport security fixes to 0.2.9.x until at least January of 2020.
You can download the source code from https://dist.torproject.org/ but most users should wait for next week's upcoming Tor Browser release, or for their upcoming system package updates.

Changes in version 0.2.9.10 - 2017-03-01

• Major bugfixes (directory authority, 0.3.0.3-alpha):
  • During voting, when marking a relay as a probable sybil, do not clear its BadExit flag: sybils can still be bad in other ways too. (We still clear the other flags.) Fixes bug 21108; bugfix on 0.2.0.13-alpha.
• Major bugfixes (IPv6 Exits, backport from 0.3.0.3-alpha):
  • Stop rejecting all IPv6 traffic on Exits whose exit policy rejects any IPv6 addresses. Instead, only reject a port over IPv6 if the exit policy rejects that port on more than an IPv6 /16 of addresses. This bug was made worse by 17027 in 0.2.8.1-alpha, which rejected a relay's own IPv6 address by default. Fixes bug 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.

• Major bugfixes (parsing, also in 0.3.0.4-rc):
  • Fix an integer underflow bug when comparing malformed Tor versions. This bug could crash Tor when built with --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor 0.2.9.8, which were built with -ftrapv by default. In other cases it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix on 0.0.8pre1. Found by OSS-Fuzz.
• Minor features (directory authorities, also in 0.3.0.4-rc):
  • Directory authorities now reject descriptors that claim to be malformed versions of Tor. Helps prevent exploitation of bug 21278.
  • Reject version numbers with components that exceed INT32_MAX. Otherwise 32-bit and 64-bit platforms would behave inconsistently. Fixes bug 21450; bugfix on 0.0.8pre1.
• Minor features (geoip):
  • Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2 Country database.
• Minor features (portability, compilation, backport from 0.3.0.3-alpha):
  • Autoconf now checks to determine if OpenSSL structures are opaque, instead of explicitly checking for OpenSSL version numbers. Part of ticket 21359.
  • Support building with recent LibreSSL code that uses opaque structures. Closes ticket 21359.
• Minor bugfixes (code correctness, also in 0.3.0.4-rc):
  • Repair a couple of (unreachable or harmless) cases of the risky comparison-by-subtraction pattern that caused bug 21278.
• Minor bugfixes (tor-resolve, backport from 0.3.0.3-alpha):
  • The tor-resolve command line tool now rejects hostnames over 255 characters in length. Previously, it would silently truncate them, which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5. Patch by "junglefowl".