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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgende Warnung des Microsoft Product Security
Notification Service. Wir geben diese Informationen unveraendert an Sie
weiter.
CVE-2009-1536 – Schwachstelle im ASP.NET Webserver
Im Scheduler fuer HTTP-Requests von ASP.NET ist eine Schwachstelle
vorhanden, die bei der Bearbeitung paralleler HTTP-Requests ausgeloest
werden kann. Ein entfernter Angreifer kann diese Schwachstelle ohne
Authentifizierung ausnutzen, um den Server zum Stillstand zu bringen
(Denial of Service).
Betroffen sind die folgenden Software Pakete und Plattformen:
Microsoft .NET Framework 2.0 Service Pack 1 und 2
Microsoft .NET Framework 3.5
Microsoft .NET Framework 3.5 Service Pack 1
Windows Vista inkl. Service Pack 1 und x64 Version
Windows Server 2008 inkl. Itanium und x64 Version
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
http://www.microsoft.com/technet/security/bulletin/ms09-036.mspx
(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.
Mit freundlichen Gruessen,
Jan Kohlrausch (CSIRT), Phone +49 40 808077-555
DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrasse 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski
CarmentiS – Early Warning Expertise
https://www.carmentis.org
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AUSCERT External Security Bulletin Redistribution
ESB-2009.1179
Vulnerability in ASP.NET in Microsoft Windows Could Allow
Denial of Service (970957)
12 August 2009
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AusCERT Security Bulletin Summary
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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
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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.
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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
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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.
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