There is a use-after-free vulnerability in file pdd_simplifier.cpp in Z3 before 4.8.8. It occurs when the solver attempt to simplify the constraints and causes unexpected memory access. It can cause segmentation faults or arbitrary code execution.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Z3 | Microsoft | * | 4.8.8 (excluding) |
| Z3 | Ubuntu | bionic | * |
| Z3 | Ubuntu | focal | * |
| Z3 | Ubuntu | lunar | * |
| Z3 | Ubuntu | mantic | * |
| Z3 | Ubuntu | oracular | * |
| Z3 | Ubuntu | trusty | * |
| Z3 | Ubuntu | xenial | * |