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Gentoo Linux Security Advisory                           GLSA 201406-23
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: DenyHosts: Denial of Service
     Date: June 25, 2014
     Bugs: #495130
       ID: 201406-23

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Synopsis
========

A vulnerability in DenyHosts could allow a remote attacker to create a
Denial of Service condition.

Background
==========

DenyHosts is a script intended to be run by Linux system administrators
to help thwart SSH server attacks.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  app-admin/denyhosts          < 2.6-r9                  >= 2.6-r9 

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

DenyHosts does not properly define the regular expressions used when
parsing SSH authentication logs.

Impact
======

A remote attacker could possibly cause a Denial of Service condition
via a crafted login name.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All DenyHost users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-admin/denyhosts-2.6-r9"

References
==========

[ 1 ] CVE-2013-6890
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-6890

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

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

 http://security.gentoo.org/glsa/glsa-201406-23.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 2014 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