CVE-2022-31146
Use After Free in Wasmtime
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
Wasmtime is a standalone runtime for WebAssembly. There is a bug in the Wasmtime's code generator, Cranelift, where functions using reference types may be incorrectly missing metadata required for runtime garbage collection. This means that if a GC happens at runtime then the GC pass will mistakenly think these functions do not have live references to GC'd values, reclaiming them and deallocating them. The function will then subsequently continue to use the values assuming they had not been GC'd, leading later to a use-after-free. This bug was introduced in the migration to the `regalloc2` register allocator that occurred in the Wasmtime 0.37.0 release on 2022-05-20. This bug has been patched and users should upgrade to Wasmtime version 0.38.2. Mitigations for this issue can be achieved by disabling the reference types proposal by passing `false` to `wasmtime::Config::wasm_reference_types` or downgrading to Wasmtime 0.36.0 or prior.
Se presenta un error en el generador de código de Wasmtime, Cranelift, en el que las funciones que usan tipos de referencia pueden carecer incorrectamente de los metadatos necesarios para la recolección de basura en tiempo de ejecución. Esto significa que si es producida una GC en tiempo de ejecución, el pase de GC pensará erróneamente que estas funciones no presentan referencias vivas a los valores de la GC, reclamándolos y reasignándolos. La función continuará entonces usando los valores asumiendo que no han sido GC'd, conllevando más tarde a un uso de memoria previamente liberada. Este bug fue introducido en la migración al asignador de registros "regalloc2" que ocurrió en Wasmtime versión 0.37.0 del 20-05-2022. Este bug ha sido parcheado y los usuarios deberían actualizar a Wasmtime versión 0.38.2. La mitigación de este problema puede lograrse al hacer una de las siguientes cosas: * Deshabilitar la propuesta de tipos de referencia pasando "false" a ["wasmtime::Config::wasm_reference_types"](https://docs.rs/wasmtime/0.38.0/wasmtime/struct.Config.html#method.wasm_reference_types). * Desactualizar a Wasmtime versión 0.36.0 o anterior
CVSS Scores
SSVC
- Decision:-
Timeline
- 2022-05-18 CVE Reserved
- 2022-07-20 CVE Published
- 2024-06-05 EPSS Updated
- 2024-08-03 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-416: Use After Free
CAPEC
References (3)
| URL | Tag | Source |
|---|---|---|
| https://github.com/WebAssembly/reference-types | Third Party Advisory | |
| https://github.com/bytecodealliance/wasmtime | Product | |
| https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5fhj-g3p3-pq9g | Mitigation |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Bytecodealliance Search vendor "Bytecodealliance" | Cranelift-codegen Search vendor "Bytecodealliance" for product "Cranelift-codegen" | >= 0.84.0 < 0.85.2 Search vendor "Bytecodealliance" for product "Cranelift-codegen" and version " >= 0.84.0 < 0.85.2" | rust |
Affected
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| Bytecodealliance Search vendor "Bytecodealliance" | Wasmtime Search vendor "Bytecodealliance" for product "Wasmtime" | >= 0.37.0 < 0.38.2 Search vendor "Bytecodealliance" for product "Wasmtime" and version " >= 0.37.0 < 0.38.2" | rust |
Affected
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