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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-2011-1978 – Schwachstelle im Microsoft .NET Framework

Im .NET Framework werden die Vertrauensstufen im System.Net.Sockets
Namensraum fehlerhaft validiert. Dies fuehrt dazu, dass ein entfernter
Angreifer unter anderem den kompletten Netzwerkverkehr eines Benutzers
zu allen Systemen, auf die der Benutzer Zugriff hat umleiten kann, aber
auch nach Systemen, auf die Zugriff besteht, im Netzwerk scannen kann.

Betroffen sind die folgenden Software Pakete und Plattformen:

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

Windows

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,
Matthias Braeck

– —
Matthias Braeck (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-2011.0824
Vulnerability in .NET Framework Could Allow Information Disclosure
10 August 2011

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

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

Product: Microsoft .NET Framework 2.0 Service Pack 2
Microsoft .NET Framework 3.5.1
Microsoft .NET Framework 4
Publisher: Microsoft
Operating System: Windows
Impact/Access: Access Confidential Data — Remote with User Interaction
Denial of Service — Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2011-1978

Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/MS11-069.mspx

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Microsoft Security Bulletin MS11-069 – Moderate
Vulnerability in .NET Framework Could Allow Information Disclosure (2567951)
Published: August 09, 2011
Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in
Microsoft .NET Framework. The vulnerability could allow information
disclosure if a user views a specially crafted Web page using a Web
browser that can run XAML Browser Applications (XBAPs). In a Web-based
attack scenario, an attacker could host a Web site that contains a Web
page that is used to exploit this vulnerability. In addition,
compromised Web sites and Web sites 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 Web sites. Instead, an
attacker would have to convince users to visit the Web site, typically
by getting them to click a link in an e-mail message or Instant
Messenger message that takes users to the attacker’s Web site. This
vulnerability could also be used by Windows .NET applications to bypass
Code Access Security (CAS) restrictions.

This security update is rated Moderate 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. For more
information, see the subsection, Affected and Non-Affected Software, in
this section.

Affected Software

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

Vulnerability Information

Socket Restriction Bypass Vulnerability – CVE-2011-1978

An information disclosure vulnerability exists in the way that .NET
Framework improperly validates the trust level within the
System.Net.Sockets namespace. An attacker who successfully exploited
this vulnerability would be able to access information not intended to
be exposed. Additionally, this vulnerability could be used by an
attacker to direct network traffic from a victim’s system to other
network resources the victim can access. This could allow an attacker
to perform a denial of service to any system the victim’s system can
access or use the victim’s system to perform scanning of network
resources available to the victim. Note that this vulnerability would
not allow an attacker to execute code or to elevate their user rights
directly, but it could be used to produce information that could be
used to try to further compromise the affected system.

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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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