Full Disclosure: [ GLSA 200802-07 ] Pulseaudio: Privilege escalation

From: Pierre-Yves Rofes <py_at_gentoo.org>
Date: Wed, 13 Feb 2008 23:54:56 +0100

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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_at_gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

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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Received on Feb 13 2008