ZDI-21-969: Microsoft Excel XLS File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of ZDI-21-969?
The severity of ZDI-21-969 is critical as it allows remote code execution in Microsoft Excel.
How do I fix ZDI-21-969?
To fix ZDI-21-969, users should apply the latest security updates provided by Microsoft for Excel.
What software is affected by ZDI-21-969?
ZDI-21-969 specifically affects Microsoft Excel for Mac installations.
What type of attack does ZDI-21-969 facilitate?
ZDI-21-969 facilitates remote code execution attacks requiring user interaction, such as opening a malicious file.
Is user interaction required to exploit ZDI-21-969?
Yes, user interaction is required as the target must visit a malicious page or open a malicious file for exploitation.