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Gentoo Linux Security Advisory                           GLSA 201203-05
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                                            https://security.gentoo.org/
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 Severity: Normal
    Title: Rack: Denial of Service
     Date: March 06, 2012
     Bugs: #396455
       ID: 201203-05

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Synopsis
=======
A hash collision vulnerability in Rack allows remote attackers to cause
a Denial of Service condition.

Background
=========
Rack is a modular Ruby web server interface.

Affected packages
================
    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-ruby/rack                < 1.1.3                    >= 1.1.3

Description
==========
Rack does not properly randomize hash functions to protect against hash
collision attacks.

Impact
=====
A remote attacker could send a specially crafted form post, possibly
resulting in a Denial of Service condition.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All Rack users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-ruby/rack-1.1.3"

References
=========
[ 1 ] CVE-2011-5036
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-5036

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

 https://security.gentoo.org/glsa/201203-05

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 2012 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.

https://creativecommons.org/licenses/by-sa/2.5/