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Secunia Security Advisory 23487

Secunia Security Advisory 23487
Posted Dec 27, 2006
Authored by Secunia | Site secunia.com

Secunia Security Advisory - h07 has discovered a weakness in Microsoft Windows, which can be exploited by malicious people to cause a DoS (Denial of Service).

tags | advisory, denial of service
systems | windows
SHA-256 | 443a3c342d593dd5b0bec62996241cec64f7aa48ded8873a62be9aeb27e7b41e

Secunia Security Advisory 23487

Change Mirror Download


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Secunia is proud to announce the availability of the Secunia Software
Inspector.

The Secunia Software Inspector is a free service that detects insecure
versions of software that you may have installed in your system. When
insecure versions are detected, the Secunia Software Inspector also
provides thorough guidelines for updating the software to the latest
secure version from the vendor.

Try it out online:
http://secunia.com/software_inspector/

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TITLE:
Windows Workstation Service NetrWkstaUserEnum Denial of Service

SECUNIA ADVISORY ID:
SA23487

VERIFY ADVISORY:
http://secunia.com/advisories/23487/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
Microsoft Windows 2000 Advanced Server
http://secunia.com/product/21/
Microsoft Windows 2000 Datacenter Server
http://secunia.com/product/1177/
Microsoft Windows 2000 Professional
http://secunia.com/product/1/
Microsoft Windows 2000 Server
http://secunia.com/product/20/
Microsoft Windows XP Home Edition
http://secunia.com/product/16/
Microsoft Windows XP Professional
http://secunia.com/product/22/

DESCRIPTION:
h07 has discovered a weakness in Microsoft Windows, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The weakness is caused due to an error in the Workstation service
when handling NetrWkstaUserEnum RPC requests with a large value in
the maxlen field.

Successful exploitation causes svchost.exe to consume a large amount
of memory and may result in the system becoming temporarily
unresponsive.

The weakness is confirmed on a fully patched Windows XP SP2 system
and has also been reported in Windows 2000 SP4.

SOLUTION:
Filter NetrWkstaUserEnum RPC requests with a large maxlen value.

PROVIDED AND/OR DISCOVERED BY:
h07

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/3013

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

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