CVE-2022-24791
Use after free in Wasmtime
Sévérité par source
Le label propre à Trivy est CRITICAL. Critique selon NVD. Plus basse selon GHSA (élevée), Ubuntu (moyenne).
Description
Wasmtime is a standalone JIT-style runtime for WebAssembly, using Cranelift. There is a use after free vulnerability in Wasmtime when both running Wasm that uses externrefs and enabling epoch interruption in Wasmtime. If you are not explicitly enabling epoch interruption (it is disabled by default) then you are not affected. If you are explicitly disabling the Wasm reference types proposal (it is enabled by default) then you are also not affected. The use after free is caused by Cranelift failing to emit stack maps when there are safepoints inside cold blocks. Cold blocks occur when epoch interruption is enabled. Cold blocks are emitted at the end of compiled functions, and change the order blocks are emitted versus defined. This reordering accidentally caused Cranelift to skip emitting some stack maps because it expected to emit the stack maps in block definition order, rather than block emission order. When Wasmtime would eventually collect garbage, it would fail to find live references on the stack because of the missing stack maps, think that they were unreferenced garbage, and therefore reclaim them. Then after the collection ended, the Wasm code could use the reclaimed-too-early references, which is a use after free. Patches have been released in versions 0.34.2 and 0.35.2, which fix the vulnerability. All Wasmtime users are recommended to upgrade to these patched versions. If upgrading is not an option for you at this time, you can avoid the vulnerability by either: disabling the Wasm reference types proposal, config.wasm_reference_types(false); or by disabling epoch interruption if you were previously enabling it. config.epoch_interruption(false).
Paquets affectés et versions corrigées
| Source | Paquet | Corrigé en |
|---|---|---|
| cargo::GitHub Security Advisory Rust | wasmtime | 0.34.2, 0.35.2 |
| conan::GitLab Advisory Database Community | wasmtime | 0.34.2, 0.35.2 |
| rapidfort ubuntu 20.04 | thunderbird | pas de correctif indiqué |
| rapidfort ubuntu 22.04 | thunderbird | pas de correctif indiqué |
| rapidfort ubuntu 24.04 | thunderbird | pas de correctif indiqué |
| ubuntu 22.04 | firefox | 1:1snap1-0ubuntu1 |
| ubuntu 22.10 | firefox | 1:1snap1-0ubuntu1 |
| ubuntu 23.04 | firefox | 1:1snap1-0ubuntu1 |
| ubuntu 23.10 | firefox | 1:1snap1-0ubuntu1 |
| ubuntu 24.04 | firefox | 1:1snap1-0ubuntu1 |
Références
- https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.epoch_interruption
- https://github.com/WebAssembly/reference-types
- https://github.com/bytecodealliance/wasmtime
- https://github.com/bytecodealliance/wasmtime/commit/666c2554ea0e1728c35aa41178cf235920db888a
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gwc9-348x-qwv2
- https://nvd.nist.gov/vuln/detail/CVE-2022-24791
- https://rustsec.org/advisories/RUSTSEC-2022-0016.html
- https://rustsec.org/advisories/RUSTSEC-2022-0099.html