cve-2022-31104
Vulnerability from cvelistv5
Published
2022-06-27 23:20
Modified
2024-08-03 07:11
Severity ?
4.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Summary
Wasmtime is a standalone runtime for WebAssembly. In affected versions wasmtime's implementation of the SIMD proposal for WebAssembly on x86_64 contained two distinct bugs in the instruction lowerings implemented in Cranelift. The aarch64 implementation of the simd proposal is not affected. The bugs were presented in the `i8x16.swizzle` and `select` WebAssembly instructions. The `select` instruction is only affected when the inputs are of `v128` type. The correspondingly affected Cranelift instructions were `swizzle` and `select`. The `swizzle` instruction lowering in Cranelift erroneously overwrote the mask input register which could corrupt a constant value, for example. This means that future uses of the same constant may see a different value than the constant itself. The `select` instruction lowering in Cranelift wasn't correctly implemented for vector types that are 128-bits wide. When the condition was 0 the wrong instruction was used to move the correct input to the output of the instruction meaning that only the low 32 bits were moved and the upper 96 bits of the result were left as whatever the register previously contained (instead of the input being moved from). The `select` instruction worked correctly if the condition was nonzero, however. This bug in Wasmtime's implementation of these instructions on x86_64 represents an incorrect implementation of the specified semantics of these instructions according to the WebAssembly specification. The impact of this is benign for hosts running WebAssembly but represents possible vulnerabilities within the execution of a guest program. For example a WebAssembly program could take unintended branches or materialize incorrect values internally which runs the risk of exposing the program itself to other related vulnerabilities which can occur from miscompilations. We have released Wasmtime 0.38.1 and cranelift-codegen (and other associated cranelift crates) 0.85.1 which contain the corrected implementations of these two instructions in Cranelift. If upgrading is not an option for you at this time, you can avoid the vulnerability by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other aarch64 hosts are not affected. Note that s390x hosts don't yet implement the simd proposal and are not affected.
References
security-advisories@github.comhttps://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simdThird Party Advisory
security-advisories@github.comhttps://github.com/bytecodealliance/wasmtime/pull/4317Issue Tracking, Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/bytecodealliance/wasmtime/pull/4318Issue Tracking, Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jqwc-c49r-4w2xMitigation, Third Party Advisory
security-advisories@github.comhttps://github.com/webassembly/simdThird Party Advisory
security-advisories@github.comhttps://webassembly.github.io/spec/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simdThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/bytecodealliance/wasmtime/pull/4317Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/bytecodealliance/wasmtime/pull/4318Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jqwc-c49r-4w2xMitigation, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/webassembly/simdThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://webassembly.github.io/spec/Third Party Advisory
Impacted products
Vendor Product Version
bytecodealliance wasmtime Version: wasmtime: < 0.38.1
Version: cranelift-codegen: < 0.85.0
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For example a WebAssembly program could take unintended branches or materialize incorrect values internally which runs the risk of exposing the program itself to other related vulnerabilities which can occur from miscompilations. We have released Wasmtime 0.38.1 and cranelift-codegen (and other associated cranelift crates) 0.85.1 which contain the corrected implementations of these two instructions in Cranelift. If upgrading is not an option for you at this time, you can avoid the vulnerability by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other aarch64 hosts are not affected. Note that s390x hosts don\u0027t yet implement the simd proposal and are not affected.\"},{\"lang\":\"es\",\"value\":\"Wasmtime es un runtime independiente para WebAssembly. En las versiones afectadas, la implementaci\u00f3n de wasmtime de la propuesta SIMD para WebAssembly en x86_64 conten\u00eda dos errores distintos en los rebajes de instrucciones implementados en Cranelift. La implementaci\u00f3n aarch64 de la propuesta simd no est\u00e1 afectada. Los errores eran presentados en las instrucciones \\\"i8x16.swizzle\\\" y \\\"select\\\" de WebAssembly. La instrucci\u00f3n \\\"select\\\" s\u00f3lo est\u00e1 afectada cuando las entradas son de tipo \\\"v128\\\". Las instrucciones de Cranelift afectadas son \\\"swizzle\\\" y \\\"select\\\". La instrucci\u00f3n \\\"swizzle\\\" que bajaba en Cranelift sobrescrib\u00eda err\u00f3neamente el registro de entrada de la m\u00e1scara, lo que pod\u00eda corromper un valor constante, por ejemplo. Esto significa que los futuros usos de la misma constante pueden ver un valor diferente al de la propia constante. La instrucci\u00f3n \\\"select\\\" que baja en Cranelift no estaba correctamente implementada para los tipos de vectores que presentan 128 bits de ancho. Cuando la condici\u00f3n era 0, es usada la instrucci\u00f3n incorrecta para mover la entrada correcta a la salida de la instrucci\u00f3n, lo que significaba que s\u00f3lo eran movidos los 32 bits inferiores y los 96 bits superiores del resultado quedaban como lo que conten\u00eda el registro anteriormente (en lugar de la entrada que era movida). Sin embargo, la instrucci\u00f3n \\\"select\\\" funcionaba correctamente si la condici\u00f3n era distinta de cero. Este error en la implementaci\u00f3n de Wasmtime de estas instrucciones en x86_64 representa una implementaci\u00f3n incorrecta de la sem\u00e1ntica especificada de estas instrucciones seg\u00fan la especificaci\u00f3n de WebAssembly. El impacto de esto es benigno para los hosts que ejecutan WebAssembly pero representa posibles vulnerabilidades dentro de la ejecuci\u00f3n de un programa invitado. Por ejemplo, un programa WebAssembly podr\u00eda tomar ramas no deseadas o materializar valores incorrectos internamente, lo que corre el riesgo de exponer el propio programa a otras vulnerabilidades relacionadas que pueden ocurrir por compilaciones err\u00f3neas. Hemos publicado Wasmtime versi\u00f3n 0.38.1 y cranelift-codegen (y otras cajas asociadas de cranelift) versi\u00f3n 0.85.1 que contienen las implementaciones corregidas de estas dos instrucciones en Cranelift. Si la actualizaci\u00f3n no es una opci\u00f3n para usted en este momento, puede evitar la vulnerabilidad al deshabilitar la propuesta Wasm simd. Adem\u00e1s, el bug s\u00f3lo est\u00e1 presente en hosts x86_64. Otros hosts aarch64 no est\u00e1n afectados. Tenga en cuenta que los hosts s390x a\u00fan no implementan la propuesta simd y no est\u00e1n afectados\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L\",\"baseScore\":4.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.2,\"impactScore\":2.5},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L\",\"baseScore\":5.6,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.2,\"impactScore\":3.4}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:P/I:P/A:P\",\"baseScore\":6.8,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-682\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:bytecodealliance:cranelift-codegen:*:*:*:*:*:rust:*:*\",\"versionEndExcluding\":\"0.85.0\",\"matchCriteriaId\":\"A97CC30F-E8C8-4589-91CB-8423704C5C5D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*\",\"versionEndExcluding\":\"0.38.1\",\"matchCriteriaId\":\"B9C6651A-233F-40DD-AB1B-1A435F97728B\"}]}]}],\"references\":[{\"url\":\"https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://github.com/bytecodealliance/wasmtime/pull/4317\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/bytecodealliance/wasmtime/pull/4318\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jqwc-c49r-4w2x\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Mitigation\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/webassembly/simd\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://webassembly.github.io/spec/\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://github.com/bytecodealliance/wasmtime/pull/4317\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/bytecodealliance/wasmtime/pull/4318\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jqwc-c49r-4w2x\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mitigation\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/webassembly/simd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://webassembly.github.io/spec/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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