Description
The SfnINSTRING function in win32k.sys in the kernel in Microsoft Windows 2000, XP, and Server 2003 allows local users to cause a denial of service (system crash) via a 0x18d value in the second argument (aka the Msg argument) of a PostMessage function call for the DDEMLEvent window.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Microsoft Windows XP/2000/2003 - 'win32k.sys' SfnINSTRING Local kernel Denial of Service EDB-12337 · dos · Apr 22, 2010
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 39631 vdb-entry
- 39456 third-party-advisory
- http://vigilance.fr/vulnerability/Windows-denials-of-service-of-win32k-sys-9607
- 20100422 Windows 2000/XP/2003 win32k.sys SfnINSTRING local kernel Denial of Service Vulnerability mailing-list