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Gentoo Linux Security Advisory                           GLSA 200612-21
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                                            https://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:

  https://security.gentoo.org/glsa/200612-21

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 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.

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