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Gentoo Linux Security Advisory                           GLSA 200407-17
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  Severity: High
     Title: l2tpd: Buffer overflow
      Date: July 22, 2004
      Bugs: #53009
        ID: 200407-17

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Synopsis
========

A buffer overflow in l2tpd could lead to remote code execution. It is
not known whether this bug is exploitable.

Background
==========

l2tpd is a GPL implentation of the Layer 2 Tunneling Protocol.

Affected packages
=================

    -------------------------------------------------------------------
     Package           /   Vulnerable   /                   Unaffected
    -------------------------------------------------------------------
  1  net-dialup/l2tpd       < 0.69-r2                       >= 0.69-r2

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

Thomas Walpuski discovered a buffer overflow that may be exploitable by
sending a specially crafted packet. In order to exploit the vulnerable
code, an attacker would need to fake the establishment of an L2TP
tunnel.

Impact
======

A remote attacker may be able to execute arbitrary code with the
privileges of the user running l2tpd.

Workaround
==========

There is no known workaround for this vulnerability.

Resolution
==========

All users are recommended to upgrade to the latest stable version:

    # emerge sync

    # emerge -pv ">=net-l2tpd-0.69-r2"
    # emerge ">=net-l2tpd-0.69-r2"

References
==========

  [ 1 ] CAN-2004-0649
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0649
  [ 2 ] Full Disclosure Report
        http://seclists.org/lists/fulldisclosure/2004/Jun/0094.html

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

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

    http://security.gentoo.org/glsa/glsa-200407-17.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/1.0

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