From: Sune Kloppenborg Jeppesen (jaervoszgentoo.org)
Date: Mon May 09 2005 - 14:31:51 CDT

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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
securitygentoo.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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