CVE-2021-21284 (GCVE-0-2021-21284)

Vulnerability from cvelistv5 – Published: 2021-02-02 17:55 – Updated: 2024-08-03 18:09
VLAI
Title
privilege escalation in Moby
Summary
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.
Severity
6.8 (Medium)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
Vendor Product Version CPE status
moby moby Affected: < 19.03.15
Affected: >= 20.0.0, < 20.10.3
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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/\u003cremapping\u003e\" 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.\u0026#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.\u0026#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": "2024-11-21T05:47:55.867",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "LOW",
              "cvssData": {
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                "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"
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              "exploitabilityScore": 5.1,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
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              "source": "nvd@nist.gov",
              "type": "Primary",
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            }
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                "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"
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              "source": "security-advisories@github.com",
              "type": "Secondary"
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                "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",
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              "impactScore": 4.0,
              "source": "nvd@nist.gov",
              "type": "Primary"
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        },
        "published": "2021-02-02T18:15:11.827",
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            "source": "security-advisories@github.com",
            "tags": [
              "Release Notes",
              "Vendor Advisory"
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            "url": "https://docs.docker.com/engine/release-notes/#20103"
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            "url": "https://security.netapp.com/advisory/ntap-20210226-0005/"
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          {
            "source": "security-advisories@github.com",
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              "Third Party Advisory"
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          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
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              {
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                "value": "CWE-22"
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            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          },
          {
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                "value": "CWE-22"
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            ],
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    },
    "redhat_vex": {
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      "current_release_date": "2026-08-14T07:00:20+00:00",
      "cve": "CVE-2021-21284",
      "id": "CVE-2021-21284",
      "initial_release_date": "2021-02-02T00:00:00+00:00",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "docker: access to remapped root allows privilege escalation to real root",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-21284.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-08-31T02:08:14Z",
      "cve": "CVE-2021-21284",
      "id": "CVE-2021-21284",
      "initial_release_date": "2023-02-15T03:46:25Z",
      "product_status:known_affected": "288",
      "product_status:known_not_affected": "48",
      "product_status:recommended": "675",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-21284",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-21284.json",
      "version": "62"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.