Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

         Vulnerability in ASP.NET in Microsoft Windows Could Allow
                        Denial of Service (970957)
                              12 August 2009


        AusCERT Security Bulletin Summary

Product:           Microsoft .NET Framework 2.0
                   Microsoft .NET Framework 3.5
Publisher:         Microsoft
Operating System:  Windows Vista
                   Windows Server 2008
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-1536  

Original Bulletin: 

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

Microsoft Security Bulletin MS09-036 - Important

Vulnerability in ASP.NET in Microsoft Windows Could Allow Denial of Service

   Published: August 11, 2009

   Version: 1.0

General Information

Executive Summary

   This security update addresses a privately reported Denial of Service
   vulnerability in the Microsoft .NET Framework component of Microsoft
   Windows. This vulnerability can be exploited only when Internet
   Information Services (IIS) 7.0 is installed and ASP.NET is configured
   to use integrated mode on affected versions of Microsoft Windows. An
   attacker could create specially crafted anonymous HTTP requests that
   could cause the affected Web server to become non-responsive until the
   associated application pool is restarted. Customers who are running
   IIS 7.0 application pools in classic mode are not affected by this

   This security update is rated Important for all affected versions of
   Microsoft Windows. For more information, see the subsection, Affected
   and Non-Affected Software, in this section.

   The security update addresses the vulnerability by changing the way
   ASP.NET manages request scheduling. For more information about the
   vulnerability, see the Frequently Asked Questions (FAQ) subsection for
   the specific vulnerability entry under the next section, Vulnerability

   Recommendation.  The majority of customers have automatic updating
   enabled and will not need to take any action because this security
   update will be downloaded and installed automatically. Customers who
   have not enabled automatic updating need to check for updates and
   install this update manually. For information about specific
   configuration options in automatic updating, see Microsoft
   Knowledge Base Article 294871.

   For administrators and enterprise installations, or end users who want
   to install this security update manually, Microsoft recommends that
   customers apply the update at the earliest opportunity using update
   management software, or by checking for updates using the
   Microsoft Update service.

Affected Software

   Microsoft .NET Framework 2.0 Service Pack 1
   Microsoft .NET Framework 3.5 (KB972593)
   Microsoft .NET Framework 2.0 Service Pack 2
   Microsoft .NET Framework 3.5 Service Pack 1 (KB972594)

Vulnerability Information

Remote Unauthenticated Denial of Service in ASP.NET Vulnerability -

   A Denial of Service vulnerability exists in the way ASP.NET manages
   request scheduling. An attacker could exploit this vulnerability by
   creating specially crafted anonymous HTTP requests that would cause
   the affected Web server to become non-responsive until the associated
   application pool is restarted.

- --------------------------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:


If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


Australian Computer Emergency Response Team
The University of Queensland
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.
Comment: http://www.auscert.org.au/render.html?it=1967