VUPEN Vulnerability Research Team discovered a critical vulnerability affecting Microsoft Office Excel. The vulnerability is caused by a heap corruption error when processing malformed RTD (recType 0x813) records, which could be exploited by attackers to execute arbitrary code by tricking a user into opening a specially crafted Excel document.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/90522/msexcelrtd-corrupt.txt
Source: https://packetstormsecurity.com/files/90522/Microsoft-Office-Excel-RTD-Heap-Corruption.html