[Full-disclosure] [ GLSA 200705-14 ] XScreenSaver: Privilege escalation

[Raphael Marichez]

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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 at gentoo.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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