Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha does not properly manage key data in memory, which might allow local users to obtain sensitive information by leveraging the ability to read memory that was previously used by a different process.
archives.seul.org/or/announce/Jan-2011/msg00000.html
blog.torproject.org/blog/tor-02129-released-security-patches
secunia.com/advisories/42905
secunia.com/advisories/42907
www.debian.org/security/2011/dsa-2148
www.openwall.com/lists/oss-security/2011/01/18/7
www.securityfocus.com/bid/45832
www.securitytracker.com/id?1024980
www.vupen.com/english/advisories/2011/0131
www.vupen.com/english/advisories/2011/0132
gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog
trac.torproject.org/projects/tor/ticket/2384
trac.torproject.org/projects/tor/ticket/2385