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                                    CERT-Renater

                         Note d'Information No. 2006/VULN576
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DATE                      : 20/12/2006

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Ruby.

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Gentoo Linux Security Advisory                           GLSA 200612-21
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                                             http://security.gentoo.org/
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   Severity: Normal
      Title: Ruby: Denial of Service vulnerability
       Date: December 20, 2006
       Bugs: #157048
         ID: 200612-21

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Synopsis
========

The Ruby cgi.rb CGI library is vulnerable to a Denial of Service
attack.

Background
==========

Ruby is a dynamic, open source programming language with a focus on
simplicity and productivity.

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

     -------------------------------------------------------------------
      Package        /  Vulnerable  /                        Unaffected
     -------------------------------------------------------------------
   1  dev-lang/ruby     < 1.8.5_p2                          >= 1.8.5_p2

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

The read_multipart function of the CGI library shipped with Ruby
(cgi.rb) does not properly check boundaries in MIME multipart content.
This is a different issue than GLSA 200611-12.

Impact
======

The vulnerability can be exploited by sending the cgi.rb library a
crafted HTTP request with multipart MIME encoding that contains a
malformed MIME boundary specifier. Successful exploitation of the
vulnerability causes the library to go into an infinite loop.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Ruby users should upgrade to the latest version:

     # emerge --sync
     # emerge --ask --oneshot --verbose ">=dev-lang/ruby-1.8.5_p2"

References
==========

   [ 1 ] CVE-2006-6303
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6303

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

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

   http://security.gentoo.org/glsa/glsa-200612-21.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 2006 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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