-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0535
Vulnerability in .NET Framework Could Allow Remote Code Execution (2706726)
                               13 June 2012

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           .NET Framework
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-1855  

Original Bulletin: 
   http://technet.microsoft.com/en-us/security/bulletin/ms12-038

- --------------------------BEGIN INCLUDED TEXT--------------------

Microsoft Security Bulletin MS12-038 - Critical

Vulnerability in .NET Framework Could Allow Remote Code Execution
(2706726)

Published Date: June 12, 2012 | Updated Date: Unspecified

Version: 1.0

General Information

Executive Summary

This security update resolves one privately reported vulnerability
in the Microsoft .NET Framework. The vulnerability could allow
remote code execution on a client system if a user views a specially
crafted webpage using a web browser that can run XAML Browser
Applications (XBAPs). Users whose accounts are configured to have
fewer user rights on the system could be less impacted than users
who operate with administrative user rights. The vulnerability could
also be used by Windows .NET Framework applications to bypass Code
Access Security (CAS) restrictions. In a web browsing attack scenario,
an attacker could host a website that contains a webpage that is
used to exploit this vulnerability. In addition, compromised websites
and websites that accept or host user-provided content or advertisements
could contain specially crafted content that could exploit this
vulnerability. In all cases, however, an attacker would have no way
to force users to visit these websites. Instead, an attacker would
have to convince users to visit the website, typically by getting
them to click a link in an email message or Instant Messenger message
that takes users to the attacker's website.

This security update is rated Critical for Microsoft .NET Framework
2.0 Service Pack 2, Microsoft .NET Framework 3.5.1, and Microsoft
.NET Framework 4 on all supported editions of Microsoft Windows.

The security update addresses the vulnerability by correcting the
manner in which the .NET Framework validates data passed to function
pointers.

Affected Software

Microsoft .NET Framework 2.0 Service Pack 2
Microsoft .NET Framework 3.5.1
Microsoft .NET Framework 4

Vulnerability Information

.NET Framework Memory Access Vulnerability - CVE-2012-1855
A remote code execution vulnerability exists in the Microsoft .NET
Framework due to the improper execution of a function pointer. An
attacker who successfully exploited this vulnerability could take
complete control of an affected system. An attacker could then
install programs; view, change, or delete data; or create new
accounts with full user rights. Users whose accounts are configured
to have fewer user rights on the system could be less impacted than
users who operate with administrative user rights.

To view this vulnerability as a standard entry in the Common
Vulnerabilities and Exposures list, see CVE-2012-1855.

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=oZcG
-----END PGP SIGNATURE-----