Free of memory not on the heap in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Weakness
The product calls free() on a pointer to memory that was not allocated using associated heap allocation functions such as malloc(), calloc(), or realloc().
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| 365_apps | Microsoft | - (including) | - (including) |
| Excel | Microsoft | 2016 (including) | 2016 (including) |
| Office | Microsoft | 2019 (including) | 2019 (including) |
| Office_long_term_servicing_channel | Microsoft | 2021 (including) | 2021 (including) |
| Office_long_term_servicing_channel | Microsoft | 2024 (including) | 2024 (including) |
Potential Mitigations
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- For example, glibc in Linux provides protection against free of invalid pointers.