Microsoft Office Excel PtgName Out-Of-Bounds Access Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office Excel. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of references to defined names in Excel worksheet files. A crafted PtgName structure can trigger a memory access outside the bounds of an allocated data structure. An attacker can leverage this vulnerability to execute code under the context of the current process.