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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-2010-3961 – Schwachstelle in der Microsoft Windows Consent UI
Die User Account Control (UAC) ist ein Bestandteil des Windows
Betriebssystems ab Windows Vista und bewirkt, dass die Rechte der
Benutzer mit administrativen Rechten eingeschraenkt sind. Allerdings
kann ein Benutzer seine Rechte interaktiv ueber die Consent UI erhoehen,
um administrative Aufgaben zu bewaeltigen. Trotzdem schraenkt dies als
Folge die Privilegien von Malware ein, die unter Benutzer-Accounts
laufen. Aufgrund der fehlerhaften Behandlung von Registry-Schluesseln
durch die Windows Consent UI kann ein Programm beliebige Befehle mit den
Rechten des Accounts LocalSystem ausfuehren. Ein Angreifer kann die
Schwachstelle ausnutzen, um die User Account Control zu umgehen und
beliebigen Code mit erweiterten Rechten auszufuehren. Voraussetzung ist
allerdings, dass das Programm mit den Rechten eines Accounts laeuft, der
das Privileg “SeImpersonatePrivilege” besitzt.
Betroffen sind die folgenden Software Pakete und Plattformen:
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 Server 2008 fuer 32-bit Systeme
Windows Server 2008 fuer 32-bit Systeme Service Pack 2
Windows Server 2008 fuer x64-Systeme
Windows Server 2008 fuer x64-Systeme Service Pack 2
Windows Server 2008 fuer Itanium Systeme
Windows Server 2008 fuer Itanium Systeme Service Pack 2
Windows 7 fuer 32-bit Systeme
Windows 7 fuer x64-Systeme
Windows Server 2008 R2 x64 Systeme
Windows Server 2008 R2 Itanium 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,
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-2010.1141
Vulnerability in Consent User Interface Could Allow
Elevation of Privilege (2442962)
15 December 2010
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AusCERT Security Bulletin Summary
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Product: Consent User Interface
Publisher: Microsoft
Operating System: Windows Vista
Windows 7
Windows Server 2008
Impact/Access: Administrator Compromise — Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2010-3961
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS10-100.mspx
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Microsoft Security Bulletin MS10-100 – Important
Vulnerability in Consent User Interface Could Allow Elevation of Privilege
(2442962)
Version: 1.0
General Information
Executive Summary
This security update resolves a privately reported vulnerability in the
Consent User Interface (UI). The vulnerability could allow elevation of
privilege if an attacker runs a specially crafted application on an
affected system. An attacker must have valid logon credentials and the
SeImpersonatePrivilege and be able to log on locally to exploit this
vulnerability. The vulnerability could not be exploited remotely or by
anonymous users.
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.
The security update addresses the vulnerability by correcting the manner in
which the Consent UI processes values read from the registry. For more
information about the vulnerability, see the Frequently Asked Questions (FAQ)
subsection for the specific vulnerability entry under the next section,
Vulnerability Information.
Affected Software
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 Server 2008 for 32-bit Systems
Windows Server 2008 for 32-bit Systems Service Pack 2**
Windows Server 2008 for x64-based Systems**
Windows Server 2008 for x64-based Systems Service Pack 2**
Windows Server 2008 for Itanium-based Systems
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems**
Windows Server 2008 R2 for Itanium-based Systems
**Server Core installation not affected.
Vulnerability Information
Consent UI Impersonation Vulnerability – CVE-2010-3961
An elevation of privilege vulnerability exists in the way that the
Consent User Interface (UI) improperly processes special values read
from the registry. The vulnerability could allow an attacker to run code
with elevated privileges. An attacker who successfully exploited this
vulnerability could execute arbitrary code and take complete control of
an affected system. An attacker could then install programs; view, change,
or delete data; or create new accounts with full user rights.
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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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