CVE-2022-39394
Description
Wasmtime is a standalone runtime for WebAssembly. Prior to version 2.0.2, there is a bug in Wasmtime's C API implementation where the definition of the `wasmtime_trap_code` does not match its declared signature in the `wasmtime/trap.h` header file. This discrepancy causes the function implementation to perform a 4-byte write into a 1-byte buffer provided by the caller. This can lead to three zero bytes being written beyond the 1-byte location provided by the caller. This bug has been patched and users should upgrade to Wasmtime 2.0.2. This bug can be worked around by providing a 4-byte buffer casted to a 1-byte buffer when calling `wasmtime_trap_code`. Users of the `wasmtime` crate are not affected by this issue, only users of the C API function `wasmtime_trap_code` are affected.
How to fix
- bytecodealliance wasmtime1.0.2, 2.0.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bytecodealliance wasmtime | v < 1.0.2, 2.0.0 ≤ v < 2.0.2 | 1.0.2, 2.0.2 |
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