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Gentoo Linux Security Advisory                           GLSA 200503-27
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Xzabite dyndnsupdate: Multiple vulnerabilities
      Date: March 21, 2005
      Bugs: #84659
        ID: 200503-27

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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@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