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From: koon at gentoo.org (Thierry Carrez)
Subject: [ GLSA 200410-13 ] BNC: Input validation flaw

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Gentoo Linux Security Advisory                           GLSA 200410-13
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: BNC: Input validation flaw
      Date: October 15, 2004
      Bugs: #66912
        ID: 200410-13

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Synopsis
========

BNC contains an input validation flaw which might allow a remote
attacker to issue arbitrary IRC related commands.

Background
==========

BNC is an IRC proxying server

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

    -------------------------------------------------------------------
     Package      /  Vulnerable  /                          Unaffected
    -------------------------------------------------------------------
  1  net-irc/bnc       < 2.8.9                                >= 2.8.9

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

A flaw exists in the input parsing of BNC where part of the
sbuf_getmsg() function handles the backspace character incorrectly.

Impact
======

A remote user could issue commands using fake authentication
credentials and possibly gain access to scripts running on the client
side.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All BNC users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-irc/bnc-2.8.9"
    # emerge ">=net-irc/bnc-2.8.9"

References
==========

  [ 1 ] BNC Changes
        http://www.gotbnc.com/changes.html#2.8.9

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

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

  http://security.gentoo.org/glsa/glsa-200410-13.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@...too.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/1.0

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