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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2009.1179 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: http://www.microsoft.com/technet/security/bulletin/MS09-036.mspx - --------------------------BEGIN INCLUDED TEXT-------------------- Microsoft Security Bulletin MS09-036 - Important Vulnerability in ASP.NET in Microsoft Windows Could Allow Denial of Service (970957) 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 vulnerability. 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 Information. 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 - CVE-2009-1536 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: http://www.auscert.org.au/render.html?cid=1980 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: http://www.auscert.org.au/render.html?it=3192 =========================================================================== 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 iD8DBQFKgiSDNVH5XJJInbgRAl7+AJ0a/GkomrTZLYZsMaQtaibKZeYgTgCfYmxC Es6XaQJTIsfk+/Xq0wlp0Jw= =8gzS -----END PGP SIGNATURE-----