bugtraq - [ GLSA 200508-16 ] Tor: Information disclosure

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Date: Thu, 25 Aug 2005 07:14:03 +0200
From: Sune Kloppenborg Jeppesen <jaervosz@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200508-16 ] Tor: Information disclosure

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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@...too.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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