CVE-2021-21284

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Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"}]}]}, "references": {"reference_data": [{"name": "https://docs.docker.com/engine/release-notes/#20103", "refsource": "MISC", "url": "https://docs.docker.com/engine/release-notes/#20103"}, {"name": "https://github.com/moby/moby/releases/tag/v20.10.3", "refsource": "MISC", "url": "https://github.com/moby/moby/releases/tag/v20.10.3"}, {"name": "https://github.com/moby/moby/releases/tag/v19.03.15", "refsource": "MISC", "url": "https://github.com/moby/moby/releases/tag/v19.03.15"}, {"name": "https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc", "refsource": "CONFIRM", "url": "https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc"}, {"name": "https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c", "refsource": "MISC", "url": "https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c"}, {"name": "https://security.netapp.com/advisory/ntap-20210226-0005/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20210226-0005/"}, {"name": "DSA-4865", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4865"}, {"name": "GLSA-202107-23", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202107-23"}]}, "source": {"advisory": "GHSA-7452-xqpj-6rpc", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T18:09:15.042Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://docs.docker.com/engine/release-notes/#20103"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/moby/moby/releases/tag/v20.10.3"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/moby/moby/releases/tag/v19.03.15"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://security.netapp.com/advisory/ntap-20210226-0005/"}, {"name": "DSA-4865", "tags": ["vendor-advisory", "x_refsource_DEBIAN", "x_transferred"], "url": "https://www.debian.org/security/2021/dsa-4865"}, {"name": "GLSA-202107-23", "tags": ["vendor-advisory", "x_refsource_GENTOO", "x_transferred"], "url": "https://security.gentoo.org/glsa/202107-23"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-21284", "datePublished": "2021-02-02T17:55:22.000Z", "dateReserved": "2020-12-22T00:00:00.000Z", "dateUpdated": "2024-08-03T18:09:15.042Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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When using \"--userns-remap\", if the root user in the remapped namespace has access to the host filesystem they can modify files under \"/var/lib/docker/<remapping>\" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user."}, {"lang": "es", "value": "En Docker versiones anteriores a 9.03.15, 20.10.3, se presenta una vulnerabilidad que involucra la opci\u00f3n --userns-remap en la que un acceso a una root reasignada permite una escalada de privilegios a la root actual.&#xa0;Cuando se usa \"--userns-remap\", si el usuario root en el espacio de nombres reasignado tiene acceso al sistema de archivos del host, puede modificar archivos en \"/var/lib/docker/(remapping)\" que causa la escritura de archivos con privilegios extendidos.&#xa0;Las versiones 20.10.3 y 19.03.15 contienen parches que evitan una escalada de privilegios del usuario reasignado"}], "id": "CVE-2021-21284", "lastModified": "2026-06-17T03:35:11.603", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "LOW", "accessVector": "ADJACENT_NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 2.7, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:A/AC:L/Au:S/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 5.1, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 4.0, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": 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{"bugzilla": {"description": "docker: access to remapped root allows privilege escalation to real root", "id": "1924740", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1924740"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-732", "details": ["In Docker before versions 9.03.15, 20.10.3 there is a vulnerability involving the --userns-remap option in which access to remapped root allows privilege escalation to real root. When using \"--userns-remap\", if the root user in the remapped namespace has access to the host filesystem they can modify files under \"/var/lib/docker/<remapping>\" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.", "A flaw was found in the `userns-remap` feature of Docker. The root user in the remapped namespace can modify files under /var/lib/docker/<remapping>, leading to possible privilege escalation to the root user in the host. The highest threat from this vulnerability is to data integrity."], "name": "CVE-2021-21284", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "docker", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2021-02-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-21284\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-21284\nhttps://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc"], "threat_severity": "Moderate"}

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