[pulseaudio-discuss] PulseAudio vulnerable to CVE-2009-1894

[Diego E.]

Blatantly copying the Gentoo Advisory (since they are the security team
I have contact with) you can find all the needed information here.

The fix (pending merge on master branch) is available on my branch:

http://gitorious.org/~flameeyes/pulseaudio/flameeyes-pulseaudio

http://gitorious.org/~flameeyes/pulseaudio/flameeyes-pulseaudio/commit/84200b423ebfa7e2dad9b1b65f64eac7bf3d2114

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Gentoo Linux Security Advisory GLSA 200907-13
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http://security.gentoo.org/
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Severity: High
Title: PulseAudio: Local privilege escalation
Date: July 16, 2009
Bugs: #276986
ID: 200907-13

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Synopsis
========

A vulnerability in PulseAudio may allow a local user to execute code
with escalated privileges.

Background
==========

PulseAudio is a network-enabled sound server with an advanced plug-in
system.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 media-sound/pulseaudio < 0.9.9-r54 >= 0.9.9-r54

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

Tavis Ormandy and Julien Tinnes of the Google Security Team discovered
that the pulseaudio binary is installed setuid root, and does not drop
privileges before re-executing itself. The vulnerability has
independently been reported to oCERT by Yorick Koster.

Impact
======

A local user who has write access to any directory on the file system
containing /usr/bin can exploit this vulnerability using a race
condition to execute arbitrary code with root privileges.

Workaround
==========

Ensure that the file system holding /usr/bin does not contain
directories that are writable for unprivileged users.

Resolution
==========

All PulseAudio users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-sound/pulseaudio-0.9.9-r54"

References
==========

[ 1 ] CVE-2009-1894
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1894

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

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

http://security.gentoo.org/glsa/glsa-200907-13.xml

-- 
Diego Elio Pettenò — “Flameeyes”
http://blog.flameeyes.eu/

If you found a .asc file in this mail and know not what it is,
it's a GnuPG digital signature: http://www.gnupg.org/

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