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

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Date: Tue, 18 Aug 2009 23:37:39 +0200
From: Alex Legler <a3li@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200908-08 ] ISC DHCP: dhcpd Denial of
	Service

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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@...too.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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