—–BEGIN PGP SIGNED MESSAGE—–
Hash: SHA1
Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgende Warnung des Microsoft Product Security
Notification Service. Wir geben diese Informationen unveraendert an Sie
weiter.
CVE-2008-4609 – Denial of Service Schwachstelle im TCP/IP Stack
Das Bearbeiten von Netzwerk-Paketen mit kleiner Fenstergroesse (window
size) durch den TCP/IP Stack kann zu Resourcen-Problemen fuehren. Ein
entfernter Angreifer kann durch das Fluten des Systems mit derartigen
Paketen (z.B. mittels eines DDoS Angriff) einen Neustart des Systems
provozieren (Denial of Service).
CVE-2009-1925 – Schwachstelle im TCP/IP Stack
Im Windows TCP/IP Stack exisitiert eine Schwachstelle im Zusammenhang
mit dem Timestamp Feld. Bei der Bearbeitung von Netzwerkpaketen werden
Zustandsinformationen nicht bereinigt. Dies kann dazu fuehren, dass
ein Feld fehlerhafter Weise als Funktionspointer referenziert wird.
Ein entfernter Angreifer kann diese Schwachstelle ausnutzen, um
beliebige Kommandos auszufuehren und die vollstaendige Kontrolle ueber
das System zu gewinnen. Voraussetzung ist, dass der Angreifer eine
Verbindung zu einem Dienst aufbauen kann.
Im Moment ist noch unklar, ob die Schwachstelle sich auch
Client-seitig ausnutzen laesst (d.h.wenn die Verbindung zu dem Angreifer
aufgebaut wird). Windows XP und Server 2003 sind nicht betroffen.
CVE-2009-1926 – Denial of Service Schwachstelle im TCP/IP Stack
Das Bearbeiten von Netwerk-Paketen kann zu Resourcen-Problemen
fuehren. Falls ein Angreifer eine sehr kleine oder Null-wertige TCP
Empfaenger Fenstergroesse (receive window size) gesetzt hat, fuehrt
das Schliessen einer Verbindung mit noch erwarteten Daten dazu, dass
die Verbindung nicht vollstaendig geschlossen wird.
Ein entfernter Angreifer kann durch das Fluten des Systems mit
derartigen Paketen (z.B. mittels eines DDoS Angriff) erreichen, dass
das System keine Verbindungen mehr entgegen nimmt (Denial of Service).
Betroffen sind die folgenden Software Pakete und Plattformen:
Microsoft Windows 2000 Service Pack 4
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 mit SP2 Itanium-basiert
Windows Vista, Windows Vista Service Pack 1 und Service Pack 2
Windows Vista x64 Edition
Windows Vista x64 Edition Service Pack 1 und Service Pack 2
Windows Server 2008 32-bit Systeme inklusive Systems Service Pack 2
Windows Server 2008 x64-basiert inklusive Service Pack 2
Windows Server 2008 Itanium-basiert inklusive Service Pack 2
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
http://www.microsoft.com/technet/security/bulletin/ms09-048.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
– —–BEGIN PGP SIGNED MESSAGE—–
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2009.1267
Vulnerabilities in Windows TCP/IP Could Allow Remote Code Execution
9 September 2009
===========================================================================
AusCERT Security Bulletin Summary
———————————
Product: Windows TCP/IP
Publisher: Microsoft
Operating System: Windows 2000
Windows Server 2003
Windows Vista
Windows Server 2008
Impact/Access: Execute Arbitrary Code/Commands — Remote/Unauthenticated
Denial of Service — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2008-4609 CVE-2009-1925 CVE-2009-1926
Reference: ESB-2009.1263
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS09-048.mspx
– – ————————–BEGIN INCLUDED TEXT——————–
Microsoft Security Bulletin MS09-048 – Critical
Vulnerabilities in Windows TCP/IP Could Allow Remote Code Execution (967723)
Published: September 08, 2009
Version: 1.0
General Information
Executive Summary
This security update resolves several privately reported vulnerabilities in
Transmission Control Protocol/Internet Protocol (TCP/IP) processing. The
vulnerabilities could allow remote code execution if an attacker sent
specially crafted TCP/IP packets over the network to a computer with a
listening service. Firewall best practices and standard default firewall
configurations can help protect networks from attacks that originate outside
the enterprise perimeter. Best practices recommend that systems that are
connected to the Internet have a minimal number of ports exposed.
This security update is rated Critical for all supported editions of Windows
Vista and Windows Server 2008, and Important for all supported editions of
Microsoft Windows 2000 Service Pack 4 and Windows Server 2003. For more
information, see the subsection, Affected and Non-Affected Software, in this
section.
The security update addresses the vulnerabilities by dropping existing TCP
connections adaptively and limiting the number of new TCP connections until
system resources are restored, and changing the manner in which TCP/IP packets
are processed. For more information about the vulnerabilities, 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 immediately using update management software, or by checking
for updates using the Microsoft Update service.
See also the section, Detection and Deployment Tools and Guidance, later in
this bulletin.
Known Issues. Microsoft Knowledge Base Article 967723 documents the
currently known issues that customers may experience when installing this
security update. The article also documents recommended solutions for these
issues.
Affected Software
Microsoft Windows 2000 Service Pack 4
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista, Windows Vista Service Pack 1,
and Windows Vista Service Pack 2
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1,
and Windows Vista x64 Edition Service Pack 2
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
Vulnerability Information
TCP/IP Zero Window Size Vulnerability – CVE-2008-4609
A denial of service vulnerability exists in TCP/IP processing in
Microsoft Windows due to the way that Windows handles an excessive number of
established TCP connections. The effect of this vulnerability can be
amplified by the requirement to process specially crafted packets with a TCP
receive window size set to a very small value or zero. An attacker could
exploit the vulnerability by flooding a system with specially crafted packets
causing the affected system to stop responding to new requests or
automatically restart.
TCP/IP Timestamps Code Execution Vulnerability – CVE-2009-1925
A remote code execution vulnerability exists in the Windows TCP/IP stack due
to the TCP/IP stack not cleaning up state information correctly. This causes
the TCP/IP stack to reference a field as a function pointer when it actually
contains other information. An anonymous attacker could exploit the
vulnerability by sending specially crafted TCP/IP packets to a computer that
has a service listening over the network. An attacker who successfully
exploited this vulnerability could 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.
TCP/IP Orphaned Connections Vulnerability – CVE-2009-1926
A denial of service vulnerability exists in TCP/IP processing in Microsoft
Windows due to an error in the processing of specially crafted packets with a
small or zero TCP receive window size. If an application closes a TCP connection
with pending data to be sent and an attacker has set a small or zero TCP receive
window size, the affected server will not be able to completely close the TCP
connection. An attacker could exploit the vulnerability by flooding a system with
specially crafted packets causing the affected system to stop responding to new
requests. The system would remain non-responsive even after the attacker stops
sending malicious packets.
– – ————————–END INCLUDED TEXT——————–
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
===========================================================================
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.
===========================================================================
– —–BEGIN PGP SIGNATURE—–
Comment: http://www.auscert.org.au/render.html?it=1967
iD8DBQFKpvr0NVH5XJJInbgRAhi9AJ9XStZaj6H1aaboyaA2QzHJlm31cQCdGzBk
nqcsWp9JZNzZuIHryktmKag=
=LRaz
– —–END PGP SIGNATURE—–
—–BEGIN PGP SIGNATURE—–
Version: GnuPG v1.4.2 (GNU/Linux)
iD8DBQFKp4Y8k0kIxZMiiQ8RAiBtAJ469E0LA3Kg3G57kaFla8CZ9a9KnwCgia6+
mNkyYJ+cB3ipCO/r+CjC8QQ=
=tKFT
—–END PGP SIGNATURE—–
