Multiple heap-based buffer overflow flaws were found in the way the Base64 decoder of libotr, an Off-The-Record Messaging library and toolkit, performed decoding of certain messages. A remote attacker could provide a specially-crafted OTR message that once processed in an application linked against libotr would lead to that application crash or, potentially, arbitrary code execution with the privileges of the user running the application.

References: [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684121 [2] http://lists.cypherpunks.ca/pipermail/otr-dev/2012-July/001347.html

Relevant upstream patches: [3] http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr;a=commitdiff;h=b17232f86f8e60d0d22caf9a2400494d3c77da58 [4] http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr;a=commitdiff;h=6d4ca89cf1d3c9a8aff696c3a846ac5a51f762c1 [5] http://otr.git.sourceforge.net/git/gitweb.cgi?p=otr/libotr;a=commitdiff;h=1902baee5d4b056850274ed0fa8c2409f1187435