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ESB-2007.0572 -- [UNIX/Linux] -- Updated tcpdump packages fix BGP dissector vulnerability

Date: 30 July 2007
References: ESB-2007.0581  ESB-2007.0609  ESB-2007.0876  

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                       ESB-2007.0572 -- [UNIX/Linux]
         Updated tcpdump packages fix BGP dissector vulnerability
                               30 July 2007

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              tcpdump 3.9.6 and prior
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-3798

Original Bulletin:  
  http://marc.info/?l=full-disclosure&m=118566260713682&w=2

Comment: This advisory references vulnerabilities in products which run on
         platforms other than Gentoo Linux. It is recommended that
         administrators running tcpdump check for an updated version of the
         software for their operating system.
         
         Exploit code for this vulnerability has been publicly released.

- --------------------------BEGIN INCLUDED TEXT--------------------

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Gentoo Linux Security Advisory                           GLSA 200707-14
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                                            http://security.gentoo.org/
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  Severity: High
     Title: tcpdump: Integer overflow
      Date: July 28, 2007
      Bugs: #184815
        ID: 200707-14

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Synopsis
========

A vulnerability has been discovered in tcpdump, allowing for the
execution of arbitrary code, possibly with root privileges.

Background
==========

tcpdump is a tool for capturing and inspecting network traffic.

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

    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  net-analyzer/tcpdump     < 3.9.5-r3                   >= 3.9.5-r3

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

mu-b from Digital Labs discovered that the return value of a snprintf()
call is not properly checked before being used. This could lead to an
integer overflow.

Impact
======

A remote attacker could send specially crafted BGP packets on a network
being monitored with tcpdump, possibly resulting in the execution of
arbitrary code with the privileges of the user running tcpdump, which
is usually root.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All tcpdump users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-analyzer/tcpdump-3.9.5-r3"

References
==========

        CVE-2007-3798
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3798

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

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

  http://security.gentoo.org/glsa/glsa-200707-14.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 2007 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/2.5


- --------------------------END INCLUDED TEXT--------------------

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        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

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