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[ GLSA 200612-21 ] Ruby: Denial of Service vulnerability
From: Raphael Marichez <falco () gentoo org>
Date: Wed, 20 Dec 2006 21:24:38 +0100

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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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