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[MS] Schwachstelle im Windows Server Service - MS08-067 / TA08-297A
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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-2008-4250 - Buffer Overflow im RPC Interface des Windows Server
Service
Der Windows Server Service ist fuer die Freigabe von Shares, Druckern
und Named Pipes im Netz zustaendig. Im RPC Interface des Dienstes
laesst sich ein Buffer Overflow ausloesen. Ein Angreifer kann diese
Schwachstelle ueber das Netz dazu ausnutzen, beliebigen Code mit
SYSTEM Rechten auszufuehren.
Die Schwachstelle wird bereits aktiv ausgenutzt.
Um die Schwachstelle ausnutzen zu koennen, muessen folgende
Bedingungen erfuellt sein:
- Der Server Service ist aktiviert. Dies ist immer der Fall, wenn
Laufwerke oder Drucker freigegeben werden, jedoch kann der Service
auch ohne explizite Freigabe aktiviert sein.
- Firewall Regeln erlauben den Zugriff auf den RPC-Dienst, d.h. auf
Port 139 bzw. 445. Die Windows Firewall wird bei Freigabe von
Resourcen automatisch auf diesen Ports geoeffnet, ebenso wenn das
System Mitglied einer Windows Domaene ist.
Betroffen sind die folgenden Software Pakete und Plattformen:
Microsoft Windows 2000 Service Pack 4
Windows XP Service Pack 2
Windows XP Service Pack 3
Windows XP Professional x64 Edition
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 1
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 mit SP1 fuer Itanium-basierte Systeme
Windows Server 2003 mit SP2 fuer Itanium-basierte Systeme
Windows Vista
Windows Vista Service Pack 1
Windows Vista x64 Edition
Windows Vista x64 Edition Service Pack 1
Windows Server 2008 fuer 32-bit Systeme
Windows Server 2008 fuer x64-basierte Systeme
Windows Server 2008 fuer Itanium-basierte Systeme
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
http://www.microsoft.com/technet/security/bulletin/ms08-067.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,
Klaus Moeller, DFN-CERT
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National Cyber Alert System
Technical Cyber Security Alert TA08-297A
Microsoft Windows Server Service RPC Vulnerability
Original release date: October 23, 2008
Last revised: --
Source: US-CERT
Systems Affected
* Microsoft Windows 2000
* Microsoft Windows XP
* Microsoft Windows Server 2003
* Microsoft Windows Vista
* Microsoft Windows Server 2008
Overview
A vulnerability in the way the Microsoft Windows server service
handles RPC requests could allow an unauthenticated, remote
attacker to execute arbitrary code with SYSTEM privileges.
I. Description
Microsoft has released Microsoft Security Bulletin MS08-067 to
address a buffer oveflow vulnerability in the Windows Server
service. The vulnerability is caused by a flaw in the way the
Server service handles Remote Procedure Call (RPC) requests. For
systems running Windows 2000, XP, and Server 2003, a remote,
unauthenticated attacker could exploit this vulnerability. For
systems running Windows Vista and Server 2008, a remote attacker
would most likely need to authenticate.
Microsoft Security Bulletin MS08-067 rates this vulnerability as
"Critical" for Windows 2000, XP, and Server 2003. The bulletin also
notes "...limited, targeted attacks attempting to exploit the
vulnerability."
This vulnerability has been assigned CVE-2008-4250. Further
information is available in a Security Vulnerability & Research
blog entry and US-CERT Vulnerability Note VU#827267.
II. Impact
A remote, unauthenticated attacker could execute arbitrary code or
cause a vulnerable system to crash. Since the Server service runs
with SYSTEM privileges, an attacker could take complete control of
a vulnerable system.
III. Solution
Apply update
Microsoft has provided updates for this vulnerability in Microsoft
Security Bulletin MS08-067. Microsoft also provides security
updates through the Microsoft Update web site and Automatic
Updates. System administrators should consider using an automated
update distribution system such as Windows Server Update Services
(WSUS).
Disable Server and Computer Browser services
Disable the Server and Computer Browser services on Windows systems
that do not require those services. A typical Windows client that
is not sharing files or printers is unlikely to need either the
Server or Computer Browser services. As a best security practice,
disable all unnecessary services.
Restrict access to server service
Restrict access to the server service (TCP ports 139 and 445). As a
best security practice, only allow access to necessary network
services.
Filter affected RPC identifier
The host firewalls in Windows Vista and Windows Server 2008 can
selectively filter RPC Universally Unique Identifiers (UUID). See
Microsoft Security Bulletin MS08-067 for instructions to filter RPC
requests with the UUID equal to
4b324fc8-1670-01d3-1278-5a47bf6ee188.
IV. References
* US-CERT Vulnerability Note VU#827267 -
<http://www.kb.cert.org/vuls/id/827267>
* Microsoft Security Bulletin MS08-067 -
<http://www.microsoft.com/technet/security/Bulletin/
ms08-067.mspx>
* Microsoft Update - <https://update.microsoft.com/>
* Windows Update: Automatic Update
<http://www.microsoft.com/windows/downloads/windowsupdate/
automaticupdate.mspx>
* Windows Server Update Services (WSUS) Home -
<http://technet.microsoft.com/en-us/wsus/default.aspx>
* CVE-2008-4250 -
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4250>
* More detail about MS08-067, the out-of-band netapi32.dll
security update -
<http://blogs.technet.com/swi/archive/2008/10/23/
More-detail-about-MS08-067.aspx>
____________________________________________________________________
The most recent version of this document can be found at:
<http://www.us-cert.gov/cas/techalerts/TA08-297A.html>
____________________________________________________________________
Feedback can be directed to US-CERT Technical Staff. Please send
email to <cert@xxxxxxxx> with "TA08-297A Feedback VU#827267" in
the subject.
____________________________________________________________________
For instructions on subscribing to or unsubscribing from this
mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
____________________________________________________________________
Produced 2008 by US-CERT, a government organization.
Terms of use:
<http://www.us-cert.gov/legal.html>
____________________________________________________________________
Revision History
October 23, 2008: Initial release
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- --
Dipl. Inform. Klaus Moeller (Incident Response Team)
Phone: +49 40 808077-555, Fax: +49 40 808077-556
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
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