CVE-2021-43816 (GCVE-0-2021-43816)

Vulnerability from cvelistv5 – Published: 2022-01-05 18:55 – Updated: 2025-04-22 18:34
VLAI?
Summary
containerd is an open source container runtime. On installations using SELinux, such as EL8 (CentOS, RHEL), Fedora, or SUSE MicroOS, with containerd since v1.5.0-beta.0 as the backing container runtime interface (CRI), an unprivileged pod scheduled to the node may bind mount, via hostPath volume, any privileged, regular file on disk for complete read/write access (sans delete). Such is achieved by placing the in-container location of the hostPath volume mount at either `/etc/hosts`, `/etc/hostname`, or `/etc/resolv.conf`. These locations are being relabeled indiscriminately to match the container process-label which effectively elevates permissions for savvy containers that would not normally be able to access privileged host files. This issue has been resolved in version 1.5.9. Users are advised to upgrade as soon as possible.
Severity ?
8 (High)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-281 - Improper Preservation of Permissions
Assigner
References
Impacted products
Vendor Product Version
containerd containerd Affected: >= 1.5.0, < 1.5.9
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These locations are being relabeled indiscriminately to match the container process-label which effectively elevates permissions for savvy containers that would not normally be able to access privileged host files. This issue has been resolved in version 1.5.9. Users are advised to upgrade as soon as possible.\"},{\"lang\":\"es\",\"value\":\"containerd es un tiempo de ejecuci\u00f3n de contenedores de c\u00f3digo abierto. En las instalaciones que usan SELinux, como EL8 (CentOS, RHEL), Fedora o SUSE MicroOS, con containerd desde la versi\u00f3n v1.5.0-beta.0 como interfaz de ejecuci\u00f3n de contenedores de respaldo (CRI), un pod sin privilegios programado en el nodo puede enlazar el montaje, por medio del volumen hostPath, de cualquier archivo privilegiado y regular en el disco para un acceso completo de lectura/escritura (sans delete). Esto es conseguido al colocar la ubicaci\u00f3n dentro del contenedor del montaje del volumen hostPath en \\\"/etc/hosts\\\", \\\"/etc/hostname\\\", o \\\"/etc/resolv.conf\\\". Estas ubicaciones est\u00e1n siendo reetiquetadas indiscriminadamente para que coincidan con la etiqueta del proceso del contenedor, lo que efectivamente eleva los permisos para los contenedores inteligentes que normalmente no podr\u00edan acceder a los archivos privilegiados del host. Este problema ha sido resuelto en versi\u00f3n 1.5.9. Se recomienda a usuarios que actualicen lo antes posible.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.3,\"impactScore\":6.0},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":9.1,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.3,\"impactScore\":6.0}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:S/C:P/I:P/A:P\",\"baseScore\":6.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"SINGLE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":6.8,\"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-281\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-281\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.5.1\",\"versionEndExcluding\":\"1.5.9\",\"matchCriteriaId\":\"43387595-2EE9-4BCB-BA40-899372BAFD60\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"51312F5E-E77D-4714-A47A-EB2900F91852\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta0:*:*:*:*:*:*\",\"matchCriteriaId\":\"2C477ED1-29F2-47CC-B523-331FE4052336\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta1:*:*:*:*:*:*\",\"matchCriteriaId\":\"2DD59A2E-2AF5-4D24-A0BD-F9A7C2064A91\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta2:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D819271-9946-4A69-8EF7-AFF8AAA226CE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F87C27FC-1AE4-45BA-BCF5-D5C2AEC3F3E4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta4:*:*:*:*:*:*\",\"matchCriteriaId\":\"3F6FA16C-59DA-42A7-A75C-5E8FB0E83453\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc0:*:*:*:*:*:*\",\"matchCriteriaId\":\"2829C988-52D0-42A6-B063-B789046DBC58\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"459C3B7F-4875-42A1-B242-A342218CEFD4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"6C93E100-A2D4-4781-8C36-4DBCFD704CB2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F43624CC-D1D3-4FF0-8D97-20E190A9A56E\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A930E247-0B43-43CB-98FF-6CE7B8189835\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"80E516C0-98A4-4ADE-B69F-66A772E2BAAA\"}]}]}],\"references\":[{\"url\":\"https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\",\"Third 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    "vulnrichment": {
      "containers": "{\"cna\": {\"affected\": [{\"product\": \"containerd\", \"vendor\": \"containerd\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 1.5.0, \u003c 1.5.9\"}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"containerd is an open source container runtime. On installations using SELinux, such as EL8 (CentOS, RHEL), Fedora, or SUSE MicroOS, with containerd since v1.5.0-beta.0 as the backing container runtime interface (CRI), an unprivileged pod scheduled to the node may bind mount, via hostPath volume, any privileged, regular file on disk for complete read/write access (sans delete). Such is achieved by placing the in-container location of the hostPath volume mount at either `/etc/hosts`, `/etc/hostname`, or `/etc/resolv.conf`. These locations are being relabeled indiscriminately to match the container process-label which effectively elevates permissions for savvy containers that would not normally be able to access privileged host files. 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      "cveMetadata": "{\"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"assignerShortName\": \"GitHub_M\", \"cveId\": \"CVE-2021-43816\", \"datePublished\": \"2022-01-05T18:55:10.000Z\", \"dateReserved\": \"2021-11-16T00:00:00.000Z\", \"dateUpdated\": \"2025-04-22T18:34:15.666Z\", \"state\": \"PUBLISHED\"}",
      "dataType": "CVE_RECORD",
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    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.