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Gentoo Linux Security Advisory                           GLSA 200909-13
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                                            http://security.gentoo.org/
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  Severity: High
     Title: irssi: Execution of arbitrary code
      Date: September 12, 2009
      Bugs: #271875
        ID: 200909-13

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Synopsis
========

A remotely exploitable off-by-one error leading to a heap overflow was
found in irssi which might result in the execution of arbitrary code.

Background
==========

irssi is a modular textUI IRC client with IPv6 support.

Affected packages
=================

    -------------------------------------------------------------------
     Package        /   Vulnerable   /                      Unaffected
    -------------------------------------------------------------------
  1  net-irc/irssi      < 0.8.13-r1                       >= 0.8.13-r1

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

Nemo discovered an off-by-one error leading to a heap overflow in
irssi's event_wallops() parsing function.

Impact
======

A remote attacker might entice a user to connect to a malicious IRC
server, use a man-in-the-middle attack to redirect a user to such a
server or use ircop rights to send a specially crafted WALLOPS message,
which might result in the execution of arbitrary code with the
privileges of the user running irssi.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All irssi users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose =net-irc/irssi-0.8.13-r1

References
==========

  [ 1 ] CVE-2009-1959
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1959

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

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

  http://security.gentoo.org/glsa/glsa-200909-13.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 2009 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