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Gentoo Linux Security Advisory                           GLSA 201201-12
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: Tor: Multiple vulnerabilities
     Date: January 23, 2012
     Bugs: #388769, #394969
       ID: 201201-12

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Synopsis
========

Multiple vulnerabilities have been found in Tor, the most severe of
which may allow a remote attacker to execute arbitrary code.

Background
==========

Tor is an implementation of second generation Onion Routing, a
connection-oriented anonymizing communication service.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-misc/tor                < 0.2.2.35               >= 0.2.2.35

Description
===========

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.

Resolution
==========

All Tor users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-misc/tor-0.2.2.35"

References
==========

[ 1 ] CVE-2011-2768
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2768
[ 2 ] CVE-2011-2769
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2769
[ 3 ] CVE-2011-2778
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2778

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

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

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2012 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5