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Gentoo: IPsec-Tools Denial of Service Print E-mail
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Posted by Benjamin D. Thomas   
Gentoo IPsec-Tools contains a vulnerability that allows a remote attacker to crash the IPsec tunnel. A remote attacker could send a specially crafted IPsec message to one of the two peers during the beginning of phase 1, resulting in the termination of the IPsec exchange.
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Gentoo Linux Security Advisory                           GLSA 200705-09
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: IPsec-Tools: Denial of Service
      Date: May 08, 2007
      Bugs: #173219
        ID: 200705-09

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Synopsis
========

IPsec-Tools contains a vulnerability that allows a remote attacker to
crash the IPsec tunnel.

Background
==========

IPsec-Tools is a port of KAME's implementation of the IPsec utilities.
It contains a collection of network monitoring tools, including racoon,
ping, and ping6.

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

    -------------------------------------------------------------------
     Package                   /  Vulnerable  /             Unaffected
    -------------------------------------------------------------------
  1  net-firewall/ipsec-tools       < 0.6.7                   >= 0.6.7

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

The isakmp_info_recv() function in src/racoon/isakmp_inf.c does not
always check that DELETE (ISAKMP_NPTYPE_D) and NOTIFY (ISAKMP_NPTYPE_N)
packets are encrypted.

Impact
======

A remote attacker could send a specially crafted IPsec message to one
of the two peers during the beginning of phase 1, resulting in the
termination of the IPsec exchange.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All IPsec-Tools users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-firewall/ipsec-tools-0.6.7"

References
==========

  [ 1 ] CVE-2007-1841
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1841

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

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

  http://security.gentoo.org/glsa/glsa-200705-09.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 2007 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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