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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
==========

  [ 1 ] 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

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