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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.

Secure Channel (SChannel) ist ein Security Support Provider (SSP) der
die Secure Sockets Layer (SSL) und Transport Layer Security (TLS)
Protokolle implementiert.

CVE-2010-3229 – Schwachstelle in Microsoft SChannel

Durch Microsoft SChannel in Implementierungen der Internet Information
Services (IIS) 7.0 auf Windows Server 2008 und Windows Vista, und in IIS
7.5 auf Windows Server 2008 R2 und Windows 7 werden Client Zertifikate
nicht richtig verarbeitet. Vor der Verarbeitung eines Protocol Request
im SSL/TLS Handshake versaeumt SChannel die Pruefung einer logischen
Bedingung und der LSASS Service reagiert nicht mehr und veranlasst einen
Neustart des Systems. Ein entfernter Angreifer kann diese Schwachstelle
durch Zusenden eines entsprechend manipulierten Paketes zu einem
Denial-of-Service ausnutzen.

Betroffen sind die folgenden Software Pakete und Plattformen:

Microsoft SChannel

Windows Vista Service Pack 1
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 1
Windows Vista x64 Edition Service Pack 2
Windows 7 fuer 32-bit Systeme
Windows 7 fuer x64-basierte Systeme
Windows Server 2008 fuer 32-bit Systeme
Windows Server 2008 fuer 32-bit Systeme Service Pack 2
Windows Server 2008 fuer x64-basierte Systeme
Windows Server 2008 fuer x64-basierte Systeme Service Pack 2
Windows Server 2008 fuer Itanium-basierte Systeme
Windows Server 2008 fuer Itanium-basierte Systemef Service Pack 2
Windows Server 2008 R2 fuer x64-basierte Systeme
Windows Server 2008 R2 fuer Itanium-basierte Systeme

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

(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,
Detlev O. Matthies

– —

Detlev O. Matthies, M.Sc. (Incident Response Team)

DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-590
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrasse 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski

Automatische Warnmeldungen https://www.cert.dfn.de/autowarn

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AUSCERT External Security Bulletin Redistribution

ESB-2010.0921
Vulnerability in SChannel Could Allow Denial of Service
13 October 2010

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

AusCERT Security Bulletin Summary
———————————

Product: Internet Information Services (ISS)
Publisher: Microsoft
Operating System: Windows Vista
Windows 7
Windows Server 2008
Impact/Access: Denial of Service — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2010-3229

Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/MS10-085.mspx

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Microsoft Security Bulletin MS10-085 – Important

Vulnerability in SChannel Could Allow Denial of Service (2207566)

Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in the Secure
Channel (SChannel) security package in Windows. The vulnerability could allow
denial of service if an affected Internet Information Services (IIS) server
hosting a Secure Sockets Layer (SSL)-enabled Web site received a specially
crafted packet message. By default, IIS is not configured to host SSL Web
sites.

This security update is rated Important for all supported editions of Windows
Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2. For more
information, see the subsection, Affected and Non-Affected Software, in this
section.

Affected Software

Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition
Service Pack 2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit
Systems Service Pack 2
Windows Server 2008 for x64-based Systems and Windows Server 2008 for
x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for
Itanium-based Systems Service Pack 2
Windows Server 2008 R2 for x64-based Systems Windows Server 2008 R2 for
Itanium-based Systems

Vulnerability Information

TLSv1 Denial of Service Vulnerability – CVE-2010-3229

A denial of service vulnerability exists in the way that SChannel processes
client certificates in implementations of Internet Information Services (IIS)
7.0 on Windows Server 2008 and Windows Vista, and in IIS 7.5 on Windows Server
2008 R2 and Windows 7. A remote, anonymous attacker could send a specially
crafted network packet to the affected system that would cause the LSASS
service to stop responding and the system to restart. Systems are only
affected if SSL is enabled, which is not a default configuration.

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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

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