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Gentoo Linux Security Advisory                           GLSA 200802-02
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Doomsday: Multiple vulnerabilities
      Date: February 06, 2008
      Bugs: #190835
        ID: 200802-02

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Synopsis
========

Multiple vulnerabilities in Doomsday might allow remote execution of
arbitrary code or a Denial of Service.

Background
==========

The Doomsday Engine (deng) is a modern gaming engine for popular ID
games like Doom, Heretic and Hexen.

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

    -------------------------------------------------------------------
     Package             /     Vulnerable     /             Unaffected
    -------------------------------------------------------------------
  1  games-fps/doomsday     <= 1.9.0-beta5.2               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.
    -------------------------------------------------------------------
    -------------------------------------------------------------------
     NOTE: Packages marked with asterisks require manual intervention!

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

Luigi Auriemma discovered multiple buffer overflows in the
D_NetPlayerEvent() function, the Msg_Write() function and the
NetSv_ReadCommands() function. He also discovered errors when handling
chat messages that are not NULL-terminated (CVE-2007-4642) or contain a
short data length, triggering an integer underflow (CVE-2007-4643).
Furthermore a format string vulnerability was discovered in the
Cl_GetPackets() function when processing PSV_CONSOLE_TEXT messages
(CVE-2007-4644).

Impact
======

A remote attacker could exploit these vulnerabilities to execute
arbitrary code with the rights of the user running the Doomsday server
or cause a Denial of Service by sending specially crafted messages to
the server.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

While some of these issues could be resolved in
"games-fps/doomsday-1.9.0-beta5.2", the format string vulnerability
(CVE-2007-4644) remains unfixed. We recommend that users unmerge
Doomsday:

    # emerge --unmerge games-fps/doomsday

References
==========

  [ 1 ] CVE-2007-4642
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4642
  [ 2 ] CVE-2007-4643
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4643
  [ 3 ] CVE-2007-4644
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4644

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

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

  http://security.gentoo.org/glsa/glsa-200802-02.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 2008 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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