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@@ -1,5 +1,30 @@
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-Changes in version 0.2.3.10-alpha - 201?-??-??
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+Changes in version 0.2.3.10-alpha - 2011-12-16
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+ Tor 0.2.3.10-alpha fixes a critical heap-overflow security issue in Tor's
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+ buffers code. Absolutely everybody should upgrade.
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+
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+ The bug relied on an incorrect calculation when making data continuous
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+ in one of our IO buffers, if the first chunk of the buffer was
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+ misaligned by just the wrong amount. The miscalculation would allow an
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+ attacker to overflow a piece of heap-allocated memory. To mount this
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+ attack, the attacker would need to either open a SOCKS connection to
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+ Tor's SocksPort (usually restricted to localhost), or target a Tor
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+ instance configured to make its connections through a SOCKS proxy
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+ (which Tor does not do by default).
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+
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+ Good security practice requires that all heap-overflow bugs should be
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+ presumed to be exploitable until proven otherwise, so we are treating
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+ this as a potential code execution attack. Please upgrade immediately!
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+ This bug does not affect bufferevents-based builds of Tor. Special
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+ thanks to "Vektor" for reporting this issue to us!
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+
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+ This release also contains a few minor bugfixes for issues
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+ discovered in 0.2.3.9-alpha.
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+ o Major bugfixes:
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+ - Fix a heap overflow bug that could occur when trying to pull
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+ data into the first chunk of a buffer, when that chunk had
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+ already had some data drained from it. Fixes CVE-2011-2778;
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+ bugfix on 0.2.0.16-alpha. Reported by "Vektor".
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o Minor bugfixes:
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o Minor bugfixes:
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- If we can't attach streams to a rendezvous circuit when we
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- If we can't attach streams to a rendezvous circuit when we
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@@ -11,8 +36,6 @@ Changes in version 0.2.3.10-alpha - 201?-??-??
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Bugfix on 0.2.3.3-alpha; fixes bug 4655.
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Bugfix on 0.2.3.3-alpha; fixes bug 4655.
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- Fix compilation of the libnatpmp helper on non-Windows. Bugfix on
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- Fix compilation of the libnatpmp helper on non-Windows. Bugfix on
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0.2.3.9-alpha; fixes bug 4691. Reported by Anthony G. Basile.
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0.2.3.9-alpha; fixes bug 4691. Reported by Anthony G. Basile.
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-
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- o Minor bugfixes:
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- Fix an assertion failure when a relay with accounting enabled
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- Fix an assertion failure when a relay with accounting enabled
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starts up while dormant. Fixes bug 4702; bugfix on
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starts up while dormant. Fixes bug 4702; bugfix on
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0.2.3.9-alpha.
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0.2.3.9-alpha.
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