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Gentoo Linux Security Advisory                           GLSA 200508-16
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                                            https://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
          [ 2 ] Tor Security Announcement
        
Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/200508-16

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 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.

https://creativecommons.org/licenses/by-sa/2.0/