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Microsoft Security Bulletin MS02-071: Flaw in Windows WM_TIMER Message Handling Could Enable Privilege Elevation (328310) | |
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| Time: 20:21 EST/01:21 GMT | News Source: Microsoft TechNet Security | Posted By: Matthew Sabean | ||
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Windows messages provide a way for interactive processes to react to user events (e.g., keystrokes or mouse movements) and communicate with other interactive processes. One such message, WM_TIMER, is sent at the expiration of a timer, and can be used to cause a process to execute a timer callback function. A security vulnerability results because it's possible for one process in the interactive desktop to use a WM_TIMER message to cause another process to execute a callback function at the address of its choice, even if the second process did not set a timer. If that second process had higher privileges than the first, this would provide the first process with a way of exercising them. | ||
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