[ GLSA 200802-07 ] Pulseaudio: Privilege escalation

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200802-07
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Pulseaudio: Privilege escalation
      Date: February 13, 2008
      Bugs: #207214
        ID: 200802-07

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Synopsis
========

A vulnerability in pulseaudio may allow a local user to execute actions
with escalated privileges.

Background
==========

Pulseaudio is a networked sound server with an advanced plugin system.

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

    -------------------------------------------------------------------
     Package                 /  Vulnerable  /               Unaffected
    -------------------------------------------------------------------
  1  media-sound/pulseaudio       < 0.9.9                     >= 0.9.9

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

Marcus Meissner from SUSE reported that the pa_drop_root() function
does not properly check the return value of the system calls setuid(),
seteuid(), setresuid() and setreuid() when dropping its privileges.

Impact
======

A local attacker could cause a resource exhaustion to make the system
calls fail, which would cause Pulseaudio to run as root. The attacker
could then perform actions with root privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Pulseaudio users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-sound/pulseaudio-0.9.9"

References
==========

  [ 1 ] CVE-2008-0008
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0008

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

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

  http://security.gentoo.org/glsa/glsa-200802-07.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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