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


  Secunia CSI
+ Microsoft SCCM
-----------------------
= Extensive Patch Management

http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/


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

TITLE:
Microsoft Windows "SfnLOGONNOTIFY()" and "SfnINSTRING()" Denial of
Service

SECUNIA ADVISORY ID:
SA39456

VERIFY ADVISORY:
http://secunia.com/advisories/39456/

DESCRIPTION:
Two vulnerabilities have been discovered in Microsoft Windows, which
can be exploited by malicious, local users to cause a DoS (Denial of
Service).

1) An error exists within the "SfnLOGONNOTIFY()" function in
win32k.sys when handling window messages. This can be exploited to
cause a kernel crash by sending a specially crafted 4Ch message to
the "DDEMLEvent" window.

2) An error exists within the "SfnINSTRING()" function in win32k.sys
when handling window messages. This can be exploited to cause a
kernel crash by sending a specially crafted 18Dh message to the
"DDEMLEvent" window.

The vulnerabilities are confirmed on a fully patched Windows XP SP3.
Other versions may also be affected.

SOLUTION:
Restrict local access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
MJ0011

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

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

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

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

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

Unsubscribe: Secunia Security Advisories
http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org

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