Fail2ban: Denial of Service

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Gentoo Linux Security Advisory                          
GLSA 200702-05
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                                            http://security.gentoo.or
g/
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  Severity: Normal
     Title: Fail2ban: Denial of Service
      Date: February 16, 2007
      Bugs: #157166
        ID: 200702-05

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Synopsis
========

A flaw in Fail2ban may allow remote attackers to deny access
to
arbitrary hosts.

Background
==========

Fail2ban monitors log files for failed authentication
attempts and can
block hosts responsible for repeated attacks.

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

   
------------------------------------------------------------
-------
     Package                /  Vulnerable  /               
Unaffected
   
------------------------------------------------------------
-------
  1  net-analyzer/fail2ban       < 0.6.2                 
    >= 0.6.2

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

A flaw in the method used to parse log entries allows
remote,
unauthenticated attackers to forge authentication attempts
from other
hosts.

Impact
======

A remote attacker can add arbitrary hosts to the block list,
denying
legitimate users access to a resource.

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-0.6.2"

References
==========

  [ 1 ] CVE-2006-6302
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
6-6302

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

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

  ht
tp://security.gentoo.org/glsa/glsa-200702-05.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
securitygentoo.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