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                                  CERT-Renater

                       Note d'Information No. 2005/VULN296
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DATE                      : 10/05/2005

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running TCPDump.

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Gentoo Linux Security Advisory                           GLSA 200505-06
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                                             http://security.gentoo.org/
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   Severity: Normal
      Title: TCPDump: Decoding routines Denial of Service vulnerability
       Date: May 09, 2005
       Bugs: #90541
         ID: 200505-06

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Synopsis
========

A flaw in the decoding of network packets renders TCPDump vulnerable to
a remote Denial of Service attack.

Background
==========

TCPDump is a tool for network monitoring and data acquisition.

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

     -------------------------------------------------------------------
      Package               /  Vulnerable  /                 Unaffected
     -------------------------------------------------------------------
   1  net-analyzer/tcpdump     < 3.8.3-r2                   >= 3.8.3-r2

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

TCPDump improperly handles and decodes ISIS, BGP, LDP (CAN-2005-1279)
and RSVP (CAN-2005-1280) packets. TCPDump might loop endlessly after
receiving malformed packets.

Impact
======

A malicious remote attacker can exploit the decoding issues for a
Denial of Service attack by sending specially crafted packets, possibly
causing TCPDump to loop endlessly.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All TCPDump users should upgrade to the latest available version:

     # emerge --sync
     # emerge --ask --oneshot --verbose ">=net-analyzer/tcpdump-3.8.3-r2"

References
==========

   [ 1 ] CAN-2005-1279
         http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=2005-1279
   [ 2 ] CAN-2005-1280
         http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=2005-1280

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

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

   http://security.gentoo.org/glsa/glsa-200505-06.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


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