bugtraq - [ GLSA 200612-21 ] Ruby: Denial of Service vulnerability

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Date: Wed, 20 Dec 2006 21:24:38 +0100
From: Raphael Marichez <falco@...too.org>
To: gentoo-announce@...too.org
Cc: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200612-21 ] Ruby: Denial of Service vulnerability

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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@...too.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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