bugtraq - [ GLSA 200705-14 ] XScreenSaver: Privilege escalation

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Date: Sun, 13 May 2007 23:35:52 +0200
From: Raphael Marichez <falco@...too.org>
To: gentoo-announce@...too.org
Cc: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200705-14 ] XScreenSaver: Privilege escalation

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Gentoo Linux Security Advisory                           GLSA 200705-14
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: XScreenSaver: Privilege escalation
      Date: May 13, 2007
      Bugs: #176584
        ID: 200705-14

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Synopsis
========

XScreenSaver allows local users to bypass authentication under certain
configurations.

Background
==========

XScreenSaver is a widely used screen saver collection shipped on
systems running the X11 Window System.

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

    -------------------------------------------------------------------
     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  x11-misc/xscreensaver       < 5.02                        >= 5.02

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

XScreenSaver incorrectly handles the results of the getpwuid() function
in drivers/lock.c when using directory servers during a network outage.

Impact
======

A local user can crash XScreenSaver by preventing network connectivity
if the system uses a remote directory service for credentials such as
NIS or LDAP, which will unlock the screen.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All XScreenSaver users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-misc/xscreensaver-5.02"

References
==========

  [ 1 ] CVE-2007-1859
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1859

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

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

  http://security.gentoo.org/glsa/glsa-200705-14.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@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 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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