Gentoo: 201406-03 Fail2ban: Multiple vulnerabilities
Posted by Benjamin D. Thomas   
Gentoo Multiple vulnerabilities have been found in Fail2ban, the worst of which allows remote attackers to cause a Denial of Service condition.
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Gentoo Linux Security Advisory                           GLSA 201406-03
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: Fail2ban: Multiple vulnerabilities
     Date: June 01, 2014
     Bugs: #364883, #473118, #499802
       ID: 201406-03

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Synopsis
========

Multiple vulnerabilities have been found in Fail2ban, the worst of
which allows remote attackers to cause a Denial of Service condition.

Background
==========

Fail2ban is a tool for parsing log files and banning IP addresses which
show suspicious behavior.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-analyzer/fail2ban        < 0.8.12                  >= 0.8.12

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

Multiple vulnerabilities have been discovered in Fail2ban. Please
review the CVE identifiers referenced below for details.

Impact
======

A remote attacker could send a crafted URL to a web site which, when
parsed by Fail2ban, would deny a specific IP address. Also, errors in
regular expressions within certain filters can cause arbitrary IP
addresses to be banned. Furthermore, a local attacker could perform
symlink attacks to overwrite arbitrary files with the privileges of the
user running the application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Fail2ban users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-analyzer/fail2ban-0.8.12

References
==========

[ 1 ] CVE-2009-5023
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2009-5023
[ 2 ] CVE-2013-2178
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-2178
[ 3 ] CVE-2013-7176
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-7176

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

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

 http://security.gentoo.org/glsa/glsa-201406-03.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 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