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We have reason to believe that the effective impact of this bug is relatively small because usage of `externref` is currently quite rare. This bug has been patched and users should upgrade to Wasmtime version 0.30.0. If you cannot upgrade Wasmtime at this time, you can avoid this bug by disabling the reference types proposal by passing `false` to `wasmtime::Config::wasm_reference_types`."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-590", "description": "CWE-590: Free of Memory not on the Heap", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-787", "description": "CWE-787: Out-of-bounds Write", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-125", "description": "CWE-125: Out-of-bounds Read", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-10-04T02:06:10", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://crates.io/crates/wasmtime"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4873-36h9-wv49"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/bytecodealliance/wasmtime/commit/398a73f0dd862dbe703212ebae8e34036a18c11c"}, {"name": "FEDORA-2021-68713440cb", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/"}, {"name": "FEDORA-2021-1805eacb48", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/"}], "source": {"advisory": "GHSA-4873-36h9-wv49", "discovery": "UNKNOWN"}, "title": "Out-of-bounds read/write and invalid free with `externref`s and GC safepoints in Wasmtime ", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "[email protected]", "ID": "CVE-2021-39218", "STATE": "PUBLIC", "TITLE": "Out-of-bounds read/write and invalid free with `externref`s and GC safepoints in Wasmtime "}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "wasmtime", "version": {"version_data": [{"version_value": ">= 0.26.0, <= 0.29.0"}]}}]}, "vendor_name": "bytecodealliance"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Wasmtime is an open source runtime for WebAssembly & WASI. 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At the *next* GC, it would be determined that nothing was referencing these bogus `externref`s (because nothing could ever reference them, because they are not really `externref`s) and then Wasmtime would deallocate them and run `<ExternRef as Drop>::drop` on them. This results in a free of memory that is not necessarily on the heap (and shouldn't be freed at this moment even if it was), as well as potential out-of-bounds reads and writes. Even though support for `externref`s (via the reference types proposal) is enabled by default, unless you are creating non-null `externref`s in your host code or explicitly triggering GCs, you cannot be affected by this bug. We have reason to believe that the effective impact of this bug is relatively small because usage of `externref` is currently quite rare. This bug has been patched and users should upgrade to Wasmtime version 0.30.0. If you cannot upgrade Wasmtime at this time, you can avoid this bug by disabling the reference types proposal by passing `false` to `wasmtime::Config::wasm_reference_types`."}]}, "impact": {"cvss": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-590: Free of Memory not on the Heap"}]}, {"description": [{"lang": "eng", "value": "CWE-787: Out-of-bounds Write"}]}, {"description": [{"lang": "eng", "value": "CWE-125: Out-of-bounds Read"}]}]}, "references": {"reference_data": [{"name": "https://crates.io/crates/wasmtime", "refsource": "MISC", "url": "https://crates.io/crates/wasmtime"}, {"name": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4873-36h9-wv49", "refsource": "CONFIRM", "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4873-36h9-wv49"}, {"name": "https://github.com/bytecodealliance/wasmtime/commit/398a73f0dd862dbe703212ebae8e34036a18c11c", "refsource": "MISC", "url": "https://github.com/bytecodealliance/wasmtime/commit/398a73f0dd862dbe703212ebae8e34036a18c11c"}, {"name": "FEDORA-2021-68713440cb", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/[email protected]/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/"}, {"name": "FEDORA-2021-1805eacb48", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/[email protected]/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/"}]}, "source": {"advisory": "GHSA-4873-36h9-wv49", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T01:58:18.261Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://crates.io/crates/wasmtime"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4873-36h9-wv49"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/bytecodealliance/wasmtime/commit/398a73f0dd862dbe703212ebae8e34036a18c11c"}, {"name": "FEDORA-2021-68713440cb", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/"}, {"name": "FEDORA-2021-1805eacb48", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-39218", "datePublished": "2021-09-17T20:10:19", "dateReserved": "2021-08-16T00:00:00", "dateUpdated": "2024-08-04T01:58:18.261Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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Esto resultar\u00eda en que Wasmtime tratara ranuras de pila arbitrarias como \"externref\"s que deb\u00edan ser enraizadas para la GC. En la *next* GC, se determinar\u00eda que nada hac\u00eda referencia a estas falsas \"externref\"s (porque nada podr\u00eda hacer referencia a ellas, ya que no son realmente \"externref\"s) y entonces Wasmtime las desasignar\u00eda y ejecutar\u00eda \"(ExternRef as Drop)::drop\" sobre ellas. Esto resulta en una liberaci\u00f3n de memoria que no est\u00e1 necesariamente en la pila (y no deber\u00eda ser liberada en este momento incluso si lo estuviera), as\u00ed como potenciales lecturas y escrituras fuera de l\u00edmites. Aunque el soporte para \"externref\"s (por medio de la propuesta de tipos de referencia) est\u00e1 habilitado por defecto, a menos que est\u00e9s creando \"externref\"s no nulos en tu c\u00f3digo anfitri\u00f3n o activando expl\u00edcitamente GCs, no puedes ser afectado por este error. 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