Vulnerability · Published Nov 10, 2022 · Assigned by GitHub_M
CVE-2022-39394wasmtime_trap_code C API function has out of bounds write vulnerability
Low 3.8
In plain English
A low-severity out-of-bounds write in wasmtime from bytecodealliance. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2022-39394 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2022-39394 |
| Ubuntu:22.04:LTS | thunderbird | no fix listed | UBUNTU-CVE-2022-39394 |
| Ubuntu:24.04:LTS | thunderbird | no fix listed | UBUNTU-CVE-2022-39394 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| bytecodealliance | wasmtime | < 2.0.2 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L