[ GLSA 200508-16 ] Tor: Information disclosure

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200508-16
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                                            http://security.gentoo.org/
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  Severity: Low
     Title: Tor: Information disclosure
      Date: August 25, 2005
      Bugs: #102245
        ID: 200508-16

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Synopsis
========

A flaw in Tor leads to the disclosure of information and the loss of
anonymity, integrity and confidentiality.

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     < 0.1.0.14                           >= 0.1.0.14

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

The Diffie-Hellman implementation of Tor fails to verify the
cryptographic strength of keys which are used during handshakes.

Impact
======

By setting up a malicious Tor server and enticing users to use this
server as first hop, a remote attacker could read and modify all
traffic of the user.

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-0.1.0.14"

References
==========

  [ 1 ] CAN-2005-2643
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2643
  [ 2 ] Tor Security Announcement
        http://archives.seul.org/or/announce/Aug-2005/msg00002.html

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

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

  http://security.gentoo.org/glsa/glsa-200508-16.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
http://bugs.gentoo.org.

License
=======

Copyright 2005 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/2.0

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