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Gentoo Linux Security Advisory                           GLSA 200611-23
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Mono: Insecure temporary file creation
      Date: November 28, 2006
      Bugs: #150264
        ID: 200611-23

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Synopsis
========

Mono is vulnerable to linking attacks, potentially allowing a local
user to overwrite arbitrary files.

Background
==========

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

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

    -------------------------------------------------------------------
     Package        /   Vulnerable   /                      Unaffected
    -------------------------------------------------------------------
  1  dev-lang/mono     < 1.1.13.8.1                      >= 1.1.13.8.1

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

Sebastian Krahmer of the SuSE Security Team discovered that the
System.CodeDom.Compiler classes of Mono create temporary files with
insecure permissions.

Impact
======

A local attacker could create links in the temporary file directory,
pointing to a valid file somewhere on the filesystem. When an affected
class is called, this could result in the file being overwritten with
the rights of the user running the script.

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-1.1.13.8.1"

References
==========

  [ 1 ] CVE-2006-5072
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5072

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

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

  http://security.gentoo.org/glsa/glsa-200611-23.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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