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Gentoo Linux Security Advisory                           GLSA 200907-12
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                                            http://security.gentoo.org/
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  Severity: High
     Title: ISC DHCP: dhcpclient Remote execution of arbitrary code
      Date: July 14, 2009
      Bugs: #277729
        ID: 200907-12

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Synopsis
========

A buffer overflow in dhclient as included in the ISC DHCP
implementation allows for the remote execution of arbitrary code with
root privileges.

Background
==========

ISC DHCP is the reference implementation of the Dynamic Host
Configuration Protocol as specified in RFC 2131.

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

    -------------------------------------------------------------------
     Package        /  Vulnerable  /                        Unaffected
    -------------------------------------------------------------------
  1  net-misc/dhcp     < 3.1.1-r1                          >=3D 3.1.1-r1

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

The Mandriva Linux Engineering Team has reported a stack-based buffer
overflow in the subnet-mask handling of dhclient.

Impact
======

A remote attacker might set up a rogue DHCP server in a victim's local
network, possibly leading to the execution of arbitrary code with root
privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ISC DHCP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=3Dnet-misc/dhcp-3.1.1-r1"

References
==========

  [ 1 ] CVE-2009-0692
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-0692

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

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

  http://security.gentoo.org/glsa/glsa-200907-12.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 2009 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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