Pick a date, update ReleaseNotes. (0.2.5)
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Nick Mathewson
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Changes in version 0.2.5.13 - 2017-03-??
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Changes in version 0.2.5.13 - 2017-03-03
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Tor 0.2.5.13 backports a number of security fixes from later Tor
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releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
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this release, if for some reason they cannot upgrade to a later
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122
ReleaseNotes
122
ReleaseNotes
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@ -2,6 +2,128 @@ This document summarizes new features and bugfixes in each stable release
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of Tor. If you want to see more detailed descriptions of the changes in
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each development snapshot, see the ChangeLog file.
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Changes in version 0.2.5.13 - 2017-03-03
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Tor 0.2.5.13 backports a number of security fixes from later Tor
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releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
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this release, if for some reason they cannot upgrade to a later
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release series.
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Note that support for Tor 0.2.5.x is ending next year: we will not issue
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any fixes for the Tor 0.2.5.x series after 1 May 2018. If you need
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a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
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o Directory authority changes (backport from 0.2.8.5-rc):
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- Urras is no longer a directory authority. Closes ticket 19271.
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o Directory authority changes (backport from 0.2.9.2-alpha):
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- The "Tonga" bridge authority has been retired; the new bridge
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authority is "Bifroest". Closes tickets 19728 and 19690.
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o Directory authority key updates (backport from 0.2.8.1-alpha):
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- Update the V3 identity key for the dannenberg directory authority:
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it was changed on 18 November 2015. Closes task 17906. Patch
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by "teor".
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o Major features (security fixes, backport from 0.2.9.4-alpha):
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- Prevent a class of security bugs caused by treating the contents
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of a buffer chunk as if they were a NUL-terminated string. At
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least one such bug seems to be present in all currently used
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versions of Tor, and would allow an attacker to remotely crash
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most Tor instances, especially those compiled with extra compiler
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hardening. With this defense in place, such bugs can't crash Tor,
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though we should still fix them as they occur. Closes ticket
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20384 (TROVE-2016-10-001).
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o Major bugfixes (parsing, security, backport from 0.2.9.8):
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- Fix a bug in parsing that could cause clients to read a single
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byte past the end of an allocated region. This bug could be used
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to cause hardened clients (built with --enable-expensive-hardening)
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to crash if they tried to visit a hostile hidden service. Non-
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hardened clients are only affected depending on the details of
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their platform's memory allocator. Fixes bug 21018; bugfix on
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0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
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2016-12-002 and as CVE-2016-1254.
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o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
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- Stop a crash that could occur when a client running with DNSPort
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received a query with multiple address types, and the first
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address type was not supported. Found and fixed by Scott Dial.
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Fixes bug 18710; bugfix on 0.2.5.4-alpha.
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o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
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- Fix an error that could cause us to read 4 bytes before the
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beginning of an openssl string. This bug could be used to cause
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Tor to crash on systems with unusual malloc implementations, or
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systems with unusual hardening installed. Fixes bug 17404; bugfix
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on 0.2.3.6-alpha.
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o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
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- Avoid a difficult-to-trigger heap corruption attack when extending
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a smartlist to contain over 16GB of pointers. Fixes bug 18162;
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bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
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Reported by Guido Vranken.
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o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
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- Avoid crashing when running as a DNS proxy. Fixes bug 16248;
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bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
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o Major bugfixes (guard selection, backport from 0.2.7.6):
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- Actually look at the Guard flag when selecting a new directory
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guard. When we implemented the directory guard design, we
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accidentally started treating all relays as if they have the Guard
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flag during guard selection, leading to weaker anonymity and worse
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performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
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by Mohsen Imani.
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o Major bugfixes (key management, backport from 0.2.8.3-alpha):
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- If OpenSSL fails to generate an RSA key, do not retain a dangling
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pointer to the previous (uninitialized) key value. The impact here
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should be limited to a difficult-to-trigger crash, if OpenSSL is
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running an engine that makes key generation failures possible, or
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if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
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0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
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Baishakhi Ray.
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o Major bugfixes (parsing, backported from 0.3.0.4-rc):
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- Fix an integer underflow bug when comparing malformed Tor
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versions. This bug could crash Tor when built with
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--enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
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0.2.9.8, which were built with -ftrapv by default. In other cases
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it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
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on 0.0.8pre1. Found by OSS-Fuzz.
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o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
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- Make memwipe() do nothing when passed a NULL pointer or buffer of
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zero size. Check size argument to memwipe() for underflow. Fixes
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bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
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patch by "teor".
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o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
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- Make Tor survive errors involving connections without a
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corresponding event object. Previously we'd fail with an
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assertion; now we produce a log message. Related to bug 16248.
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o Minor features (geoip):
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- Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
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Country database.
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o Minor bugfixes (compilation, backport from 0.2.7.6):
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- Fix a compilation warning with Clang 3.6: Do not check the
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presence of an address which can never be NULL. Fixes bug 17781.
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o Minor bugfixes (crypto error-handling, backport from 0.2.7.2-alpha):
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- Check for failures from crypto_early_init, and refuse to continue.
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A previous typo meant that we could keep going with an
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uninitialized crypto library, and would have OpenSSL initialize
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its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
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when implementing ticket 4900. Patch by "teor".
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o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
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- Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
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a client authorized hidden service. Fixes bug 15823; bugfix
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on 0.2.1.6-alpha.
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Changes in version 0.2.5.12 - 2015-04-06
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Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
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could be used by an attacker to crash hidden services, or crash clients
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