=====================================================================
                                  CERT-Renater

                       Note d'Information No. 2005/VULN213
_____________________________________________________________________

DATE                      : 22/03/2005

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running dyndnsupdate.

======================================================================

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200503-27
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                             http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

   Severity: Normal
      Title: Xzabite dyndnsupdate: Multiple vulnerabilities
       Date: March 21, 2005
       Bugs: #84659
         ID: 200503-27

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

Synopsis
========

Xzabite's dyndnsupdate software suffers from multiple vulnerabilities,
potentially resulting in the remote execution of arbitrary code.

Background
==========

dyndnsupdate is a dyndns.org data updater written by Fredrik "xzabite"
Haglund.

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

     -------------------------------------------------------------------
      Package                /  Vulnerable  /                Unaffected
     -------------------------------------------------------------------
   1  net-misc/dyndnsupdate      <= 0.6.15                  Vulnerable!
     -------------------------------------------------------------------
      NOTE: Certain packages are still vulnerable. Users should migrate
            to another package if one is available or wait for the
            existing packages to be marked stable by their
            architecture maintainers.

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

Toby Dickenson discovered that dyndnsupdate suffers from multiple
overflows.

Impact
======

A remote attacker, posing as a dyndns.org server, could execute
arbitrary code with the rights of the user running dyndnsupdate.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

Currently, there is no released version of dyndnsupdate that contains a
fix for these issues. The original xzabite.org distribution site is
dead, the code contains several other problems and more secure
alternatives exist, such as the net-dns/ddclient package. Therefore,
the dyndnsupdate package has been hard-masked prior to complete removal
from Portage, and current users are advised to unmerge the package:

     # emerge --unmerge net-misc/dyndnsupdate

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

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

   http://security.gentoo.org/glsa/glsa-200503-27.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 at 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

======================================================================

         =========================================================
         Les serveurs de référence du CERT-Renater
         http://www.urec.fr/securite
         http://www.cru.fr/securite
         http://www.renater.fr
         =========================================================
         + CERT-RENATER          | tel : 01-53-94-20-44          +
         + 151 bd de l'Hopital   | fax : 01-53-94-20-41          +
         + 75013 Paris           | email: certsvp@renater.fr     +
         =========================================================