A vulnerability has been identified in Microsoft Windows, which could be exploited by remote attackers to take complete control of an affected system. This issue is caused by a double-free error within the Windows Server Library (WINSRV.DLL) and the Client Server Run-Time Subsystem (CSRSS) when calling a MessageBox API with malformed parameters and a "MB_SERVICE_NOTIFICATION" flag set, which could allow malicious users to crash a vulnerable system or execute arbitrary commands by tricking a user into visiting a specially crafted web page.
Credits
Vulnerability reported by NULL and Tim Garnett (Determina Security Research)
ChangeLog
2006-12-22 : Initial release
2007-04-10 : Updated Solution
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