A new security update has been released for Gentoo Linux - Openswan, IPsec-Tools: Vulnerabilities in ISAKMP Protocol implementation. Here the announcement:

Gentoo Linux Security Advisory GLSA 200512-04
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http://security.gentoo.org/
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Severity: Normal
Title: Openswan, IPsec-Tools: Vulnerabilities in ISAKMP Protocol
implementation
Date: December 12, 2005
Bugs: #112568, #113201
ID: 200512-04

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Synopsis
========

Openswan and IPsec-Tools suffer from an implementation flaw which may
allow a Denial of Service attack.

Background
==========

Openswan is an implementation of IPsec for Linux. IPsec-Tools is a port
of KAME's implementation of the IPsec utilities, including racoon, an
Internet Key Exchange daemon. Internet Key Exchange version 1 (IKEv1),
a derivate of ISAKMP, is an important part of IPsec. IPsec is widely
used to secure exchange of packets at the IP layer and mostly used to
implement Virtual Private Networks (VPNs).

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/openswan < 2.4.4 >= 2.4.4
2 net-firewall/ipsec-tools < 0.6.3 >= 0.6.3
*>= 0.6.2-r1
*>= 0.4-r2
-------------------------------------------------------------------
2 affected packages on all of their supported architectures.
-------------------------------------------------------------------

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

The Oulu University Secure Programming Group (OUSPG) discovered that
various ISAKMP implementations, including Openswan and racoon (included
in the IPsec-Tools package), behave in an anomalous way when they
receive and handle ISAKMP Phase 1 packets with invalid or abnormal
contents.

Impact
======

A remote attacker can create a specially crafted packet using 3DES with
an invalid key length, resulting in a Denial of Service attack, format
string vulnerabilities or buffer overflows.

Workaround
==========

Avoid using "aggressive mode" in ISAKMP Phase 1, which exchanges
information between the sides before there is a secure channel.

Resolution
==========

All Openswan users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/openswan-2.4.4"

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

# emerge --sync
# emerge --ask --oneshot --verbose net-firewall/ipsec-tools

References
==========

[ 1 ] CVE-2005-3671
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3671
[ 2 ] CVE-2005-3732
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3732
[ 3 ] Original Advisory
http://www.ee.oulu.fi/research/ouspg/protos/testing/c09/isakmp/

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

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

http://security.gentoo.org/glsa/glsa-200512-04.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 2005 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