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Gentoo Linux Security Advisory                           GLSA 200505-06
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                                            https://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
          [ 2 ] CAN-2005-1280
        
Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

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

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
https://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.

https://creativecommons.org/licenses/by-sa/2.0/