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TUCoPS :: Linux :: Gentoo :: tb11835.htm

Fail2ban: Denial of Service



Fail2ban: Denial of Service
Fail2ban: Denial of Service




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Gentoo Linux Security Advisory                           GLSA 200707-13
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: Fail2ban: Denial of Service
      Date: July 28, 2007
      Bugs: #181214
        ID: 200707-13

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Synopsis
=======
Fail2ban is vulnerable to a Denial of Service attack.

Background
=========
Fail2ban is a tool for parsing log files and banning IP addresses which
make too many password failures.

Affected packages
================
    -------------------------------------------------------------------
     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  net-analyzer/fail2ban     < 0.8.0-r1                  >= 0.8.0-r1

Description
==========
A vulnerability has been discovered in Fail2ban when parsing log files.

Impact
=====
A remote attacker could send specially crafted SSH login banners to the
vulnerable host, which would prevent any ssh connection to the host and
result in a Denial of Service.

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-0.8.0-r1"

References
=========
  [ 1 ] Original advisory
http://www.ossec.net/en/attacking-loganalysis.html#fail2ban 

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

http://security.gentoo.org/glsa/glsa-200707-13.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 
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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