Mike Reavey, operations manager of the Microsoft Security Response Center, confirmed that the company is "closely monitoring" the public posting, which first appeared on a Russian language forum on Dec. 15. It affects "csrss.exe," which is the main executable for the Microsoft Client/Server Runtime Server.

According to an alert cross-posted to security mailing lists, the vulnerability is caused by a memory corruption when certain strings are sent through the MessageBox API.

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