Microsoft Excel 2002 SP3 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted RealTimeData record, related to a stTopic field, double-byte characters, and an incorrect pointer calculation, aka "Excel Record Parsing WriteAV Vulnerability."
Microsoft Excel 2002 SP3 permite a atacantes remotos ejecutar código arbitrario o provocar una denegación de servicio (corrupción de memoria) a través de un registro RealTimeData manipulado relacionado con un campo stTopic, caracteres de bytes dobles y un cálculo incorrecto de puntero. Esta vulnerabilidad también es conocida como "Excel Record Parsing WriteAV 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.
