[ GLSA 200908-08 ] ISC DHCP: dhcpd Denial of Service

[Alex Legler <a3li () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200908-08
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: ISC DHCP: dhcpd Denial of Service
      Date: August 18, 2009
      Bugs: #275231
        ID: 200908-08

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Synopsis
========

dhcpd as included in the ISC DHCP implementation does not properly
handle special conditions, leading to a Denial of Service.

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     < 3.1.2_p1                          >= 3.1.2_p1

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

Christoph Biedl discovered that dhcpd does not properly handle certain
DHCP requests when configured both using "dhcp-client-identifier" and
"hardware ethernet".

Impact
======

A remote attacker might send a specially crafted request to dhcpd,
possibly resulting in a Denial of Service (daemon crash).

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 =net-misc/dhcp-3.1.2_p1

References
==========

  [ 1 ] CVE-2009-1892
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1892

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

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

  http://security.gentoo.org/glsa/glsa-200908-08.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
https://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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