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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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