Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges 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 |
|---|---|---|---|
| Windows_10_1809 | Microsoft | * | 10.0.17763.8276 (excluding) |
| Windows_10_21h2 | Microsoft | * | 10.0.19044.6809 (excluding) |
| Windows_10_22h2 | Microsoft | * | 10.0.19045.6809 (excluding) |
| Windows_server_2019 | Microsoft | * | 10.0.17763.8276 (excluding) |
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.