Microsoft Excel XLS File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability

ID ZDI-21-969
Type zdi
Reporter 14
Modified 2021-08-12T00:00:00


This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft 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 parsing of CONTINUEFRT12 records within XLS files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.