GLSA-201201-12 : Tor: Multiple vulnerabilities

This script is Copyright (C) 2012-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-201201-12
(Tor: Multiple vulnerabilities)

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
(CVE-2011-2778).

Impact :

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.

Workaround :

There is no known workaround at this time.

See also :

http://www.gentoo.org/security/en/glsa/glsa-201201-12.xml

Solution :

All Tor users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=net-misc/tor-0.2.2.35'

Risk factor :

High / CVSS Base Score : 7.6
(CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.6
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Gentoo Local Security Checks

Nessus Plugin ID: 57654 ()

Bugtraq ID: 50414
51097

CVE ID: CVE-2011-2768
CVE-2011-2769
CVE-2011-2778