Tor: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 201201-12 / Tor
||January 23, 2012
||January 23, 2012: 1
All supported architectures
Multiple vulnerabilities have been found in Tor, the most severe of
which may allow a remote attacker to execute arbitrary code.
Tor is an implementation of second generation Onion Routing, a
connection-oriented anonymizing communication service.
Multiple vulnerabilities have been discovered in Tor:
- When configured as client or bridge, Tor uses the same TLS
certificate chain for all outgoing connections (CVE-2011-2768).
- When configured as a bridge, Tor relays can distinguish incoming
bridge connections from client connections (CVE-2011-2769).
- An error in or/buffers.c could result in a heap-based buffer overflow
A remote attacker could possibly execute arbitrary code or cause a
Denial of Service. Furthermore, a remote relay the user is directly
connected to may be able to disclose anonymous information about that
user or enumerate bridges in the user's connection.
There is no known workaround at this time.
All Tor users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/tor-0.2.2.35"