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Gentoo Linux Security Advisory                           GLSA 200411-24
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                                            http://security.gentoo.org/
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  Severity: High
     Title: BNC: Buffer overflow vulnerability
      Date: November 16, 2004
      Bugs: #70674
        ID: 200411-24

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Synopsis
========

BNC contains a buffer overflow vulnerability that may lead to Denial of
Service and execution of arbitrary code.

Background
==========

BNC (BouNCe) is an IRC proxy server.

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

    -------------------------------------------------------------------
     Package      /  Vulnerable  /                          Unaffected
    -------------------------------------------------------------------
  1  net-irc/bnc       < 2.9.1                                >= 2.9.1

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

Leon Juranic discovered that BNC fails to do proper bounds checking
when checking server response.

Impact
======

An attacker could exploit this to cause a Denial of Service and
potentially execute arbitary code with the permissions of the user
running BNC.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All BNC users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-irc/bnc-2.9.1"

References
==========

  [ 1 ] BNC ChangeLog
        http://gotbnc.com/changes.html
  [ 2 ] LSS-2004-11-03
        http://security.lss.hr/en/index.php?page=details&ID=LSS-2004-11-03

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

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

  http://security.gentoo.org/glsa/glsa-200411-24.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 2004 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