A vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office Excel. Exploitation requires that the attacker coerce the target into opening a malicious .XLS file. The specific flaw exists within the parsing of the BIFF file format used by Microsoft Excel. During the processing of a malformed Country (0x8c) record, user-supplied data may be used in a memory copy operation resulting in memory corruption. If successfully exploited remote control of the affected system can be obtained under the credentials of the currently logged in user.
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