Gentoo: dhcpcd Denial of Service vulnerability
Posted by Benjamin D. Thomas   
Gentoo A vulnerability in dhcpcd may cause the dhcpcd daemon to crash.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200507-16
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Normal
     Title: dhcpcd: Denial of Service vulnerability
      Date: July 15, 2005
      Bugs: #98394
        ID: 200507-16

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

A vulnerability in dhcpcd may cause the dhcpcd daemon to crash.

Background
==========

dhcpcd is a standards compliant DHCP client daemon. It requests an IP
address and other information from the DHCP server, automatically
configures the network interface, and tries to renew the lease time.

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

    -------------------------------------------------------------------
     Package          /     Vulnerable     /                Unaffected
    -------------------------------------------------------------------
  1  net-misc/dhcpcd      < 1.3.22_p4-r11             >= 1.3.22_p4-r11

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

infamous42md discovered that dhcpcd can be tricked to read past the end
of the supplied DHCP buffer. As a result, this might lead to a crash of
the daemon.

Impact
======

With a malicious DHCP server an attacker could cause a Denial of
Service by crashing the DHCP client.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All dhcpcd users should upgrade to the latest available version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/dhcpcd-1.3.22_p4-r11"

References
==========

  [ 1 ] CAN-2005-1848
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1848

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

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

  http://security.gentoo.org/glsa/glsa-200507-16.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 2005 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/2.0