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Gentoo Linux Security Advisory                           GLSA 200404-17
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                                            http://security.gentoo.org/
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  Severity: Normal 
     Title: ipsec-tools and iputils contain a remote DoS vulnerability

      Date: April 24, 2004
      Bugs: #48847
        ID: 200404-17

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Synopsis
========

racoon, which is included in the ipsec-tools and iputils packages in
Portage, does not check the length of ISAKMP headers. Attackers may be
able to craft an ISAKMP header of sufficient length to consume all
available system resoources, causing a Denial of Service.

Background
==========

From http://ipsec-tools.sourceforge.net/ :

"IPsec-Tools is a port of KAME's IPsec utilities to the Linux-2.6 IPsec
implementation."

iputils is a collection of network monitoring tools, including racoon,
ping and ping6.

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

    -------------------------------------------------------------------
     Package                   /    Vulnerable    /         Unaffected
    -------------------------------------------------------------------
     net-firewall/ipsec-tools         < 0.3.1                 >= 0.3.1
     net-misc/iputils              == 021109-r1           == 021109-r3

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

When racoon receives an ISAKMP header, it allocates memory based on the
length of the header field. Thus, an attacker may be able to cause a
Denial of Services by creating a header that is large enough to consume
all available system resources.

Impact
======

This vulnerability may allow an attacker to remotely cause a Denial of
Service.

Workaround
==========

A workaround is not currently known for this issue. All users are
advised to upgrade to the latest version of the affected package.

Resolution
==========

ipsec-tools users should upgrade to version 0.2.5 or later:

    # emerge sync

    # emerge -pv ">=net-firewall/ipsec-tools-0.3.1"
    # emerge ">=net-firewall/ipsec-tools-0.3.1"

iputils users should upgrade to version 021109-r3 or later:

    # emerge sync

    # emerge -pv ">=net-misc/iputils-021109-r3"
    # emerge ">=net-misc/iputils-021109-r3"

References
==========

  [ 1 ] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0403

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

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

     http://security.gentoo.org/glsa/glsa-200404-17.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 Technologies, 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