Microsoft Excel File Format Parsing Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office. 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 malformed BOOLERR records, user-supplied data may be insecurely referenced thereby leading to the eventual execution of arbitrary code.