Gentoo: 201309-03 Xlockmore: Denial of Service
Posted by Benjamin D. Thomas   
Gentoo A buffer overflow in Xlockmore might allow remote attackers to cause a Denial of Service.
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Gentoo Linux Security Advisory                           GLSA 201309-03
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: Xlockmore: Denial of Service
     Date: September 02, 2013
     Bugs: #255229, #440776, #477328
       ID: 201309-03

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Synopsis
========

A buffer overflow in Xlockmore might allow remote attackers to cause a
Denial of Service.

Background
==========

Xlockmore is just another screensaver application for X.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  x11-misc/xlockmore            < 5.43                     >= 5.43

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

A Denial of Service flaw was found in the way Xlockmore performed
the passing of arguments to the underlying localtime() call, when the
'dlock' mode was used.

Impact
======

A local attacker could possibly cause a Denial of Service condition and
potentially obtain unauthorized access to the graphical session,
previously locked by another user.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Xlockmore users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=x11-misc/xlockmore-5.43"

References
==========

[ 1 ] CVE-2012-4524
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-4524
[ 2 ] CVE-2013-4143
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-4143

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

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

 http://security.gentoo.org/glsa/glsa-201309-03.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
https://bugs.gentoo.org.

License

Copyright 2013 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