GLSA 200508-16 Tor: Information disclosure
Posted on: 08/25/2005 04:58 AM

A new security update has been released for Gentoo Linux - Tor: Information disclosure. Here the announcement:

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 lt; 0.1.0.14 gt;= 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 "gt;=net-misc/tor-0.1.0.14"

References
==========

[ 1 ] CAN-2005-2643
http://www.cve.mitre.org/cgi-bin/cvename.cgi?nameƊN-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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