Gentoo: 201311-04 Vixie cron: Denial of Service
Posted by Benjamin D. Thomas   
Gentoo A vulnerability has been found in Vixie cron, allowing local attackers to conduct symlink attacks.
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Gentoo Linux Security Advisory                           GLSA 201311-04
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: Vixie cron: Denial of Service
     Date: November 07, 2013
     Bugs: #308055
       ID: 201311-04

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Synopsis
========

A vulnerability has been found in Vixie cron, allowing local attackers
to conduct symlink attacks.

Background
==========

Paul Vixie's cron daemon, a fully featured crond implementation.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  sys-process/vixie-cron      < 4.1-r14                 >= 4.1-r14

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

Vixie cron contains a race condition relating to atime and mtime values
of temporary files.

Impact
======

A local attacker could change the modification time of files, possibly
resulting in a Denial of Service condition via a symlink attack.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Vixie cron users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=sys-process/vixie-cron-4.1-r14"

References
==========

[ 1 ] CVE-2010-0424
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2010-0424

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

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

 http://security.gentoo.org/glsa/glsa-201311-04.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