[ GLSA 200909-13 ] irssi: Execution of arbitrary code

[Alex Legler <a3li () gentoo org>]

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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

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