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Gentoo Linux Security Advisory                           GLSA 200711-10
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Mono: Buffer overflow
      Date: November 07, 2007
      Bugs: #197067
        ID: 200711-10

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Synopsis
========

Mono's BigInteger implementation contains a buffer overflow
vulnerability that might lead to the execution of arbitrary code.

Background
==========

Mono provides the necessary software to develop and run .NET client and
server applications on various platforms.

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

    -------------------------------------------------------------------
     Package        /   Vulnerable   /                      Unaffected
    -------------------------------------------------------------------
  1  dev-lang/mono     < 1.2.5.1-r1                      >= 1.2.5.1-r1

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

IOActive discovered an error in the Mono.Math.BigInteger class, in the
reduction step of the Montgomery-based Pow methods, that could lead to
a buffer overflow.

Impact
======

A remote attacker could exploit this vulnerability by sending specially
crafted data to Mono applications using the BigInteger class, which
might lead to the execution of arbitrary code with the privileges of
the user running the application (possibly root) or a Denial of
Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Mono users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-lang/mono-1.2.5.1-r1"

References
==========

  [ 1 ] CVE-2007-5197
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5197

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

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

  http://security.gentoo.org/glsa/glsa-200711-10.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 2007 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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