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[ GLSA 201201-12 ] Tor: Multiple vulnerabilities
From: Sean Amoss <ackle () gentoo org>
Date: Mon, 23 Jan 2012 15:21:41 -0500

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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

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