full-disclosure - [ GLSA 200702-05 ] Fail2ban: Denial of Service

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Message-ID: <20070216003927.GC7503@falco.falcal.net>
Date: Fri, 16 Feb 2007 01:39:27 +0100
From: Raphael Marichez <falco@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200702-05 ] Fail2ban: Denial of Service

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Gentoo Linux Security Advisory                           GLSA 200702-05
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                                            http://security.gentoo.org/
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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-2006-6302

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

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

  http://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
security@...too.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

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