CVE-2022-24791

{"id": "CVE-2022-24791", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 6.8, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}]}, "published": "2022-03-31T23:15:08.063", "references": [{"url": "https://github.com/bytecodealliance/wasmtime/commit/666c2554ea0e1728c35aa41178cf235920db888a", "tags": ["Patch", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gwc9-348x-qwv2", "tags": ["Mitigation", "Third Party Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "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)."}, {"lang": "es", "value": "Wasmtime es un tiempo de ejecuci\u00f3n independiente de estilo JIT para WebAssembly, usando Cranelift. Se presenta una vulnerabilidad de uso de memoria previamente liberada en Wasmtime cuando es ejecutado Wasm que usa externrefs y es habilitada la interrupci\u00f3n de \u00e9poca en Wasmtime. Si no est\u00e1 habilitando expl\u00edcitamente la interrupci\u00f3n de \u00e9poca (est\u00e1 deshabilitada por defecto) entonces no est\u00e1 afectado. Si est\u00e1 deshabilitando expl\u00edcitamente la propuesta de tipos de referencia de Wasm (est\u00e1 habilitada por defecto) entonces tampoco le afecta. El uso de memoria previamente liberada es causado por Cranelift que no emite mapas de pila cuando se presentan puntos de seguridad dentro de los bloques fr\u00edos. Los bloques fr\u00edos son producidos cuando la interrupci\u00f3n de la \u00e9poca est\u00e1 habilitada. Los bloques fr\u00edos son emitidos al final de las funciones compiladas, y cambian el orden en que son emitidos los bloques frente a los definidos. Esta reordenaci\u00f3n caus\u00f3 accidentalmente que Cranelift omitiera la emisi\u00f3n de algunos mapas de pila porque esperaba emitir los mapas de pila en orden de definici\u00f3n de bloques, en lugar de en orden de emisi\u00f3n de bloques. Cuando Wasmtime recog\u00eda finalmente la basura, no encontraba referencias vivas en la pila debido a los mapas de pila faltantes, pensaba que eran basura no referenciada y, por tanto, los reclamaba. Entonces, una vez terminada la recolecci\u00f3n, el c\u00f3digo Wasm pod\u00eda usar las referencias recuperadas demasiado pronto, lo cual es un uso de memoria previamente liberada. Han sido publicados parches en versiones 0.34.2 y 0.35.2, que corrigen la vulnerabilidad. Es recomendado a todos los usuarios de Wasmtime actualizar a estas versiones parcheadas. Si actualizar no es una opci\u00f3n para ti en este momento, puedes evitar la vulnerabilidad: deshabilitando la propuesta de tipos de referencia de Wasm, config.wasm_reference_types(false); o deshabilitando la interrupci\u00f3n de \u00e9poca si la estabas habilitando previamente. config.epoch_interruption(false)"}], "lastModified": "2022-04-08T16:35:28.077", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "7ECB8D81-3539-4C1C-AE07-DEF4ABC95699", "versionEndExcluding": "0.34.2", "versionStartIncluding": "0.34.0"}, {"criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "6A238AA9-2742-42B1-BFA7-9BE16087BCE5", "versionEndExcluding": "0.35.2", "versionStartIncluding": "0.35.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}