Microsoft Office Excel RealTimeData Record Parsing 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 flaw exists within the methods used for RealTimeData Record Parsing. When handling a stTopic field has a bit set specifying double byte characters in the following field the value of a global pointer is improperly calculated. This pointer is later used in a memcpy operation whose source is user supplied data. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the user.