Vulnerability-Lookup

UBUNTU-CVE-2021-21284 (CVE-2021-21284)

Vulnerability from osv_ubuntu – Published: 2021-02-02 18:15 – Updated: 2025-09-08 16:46 – Source website

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/" 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

6.8 (Medium)


                    
                      CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-21284	REPORT
	https://github.com/moby/moby/security/advisories/…	REPORT
	https://docs.docker.com/engine/release-notes/#20103	REPORT
	https://github.com/moby/moby/commit/64bd4485b3a66…	REPORT
	https://github.com/moby/moby/releases/tag/v19.03.15	REPORT
	https://github.com/moby/moby/releases/tag/v20.10.3	REPORT
	https://ubuntu.com/security/notices/USN-5032-1	ADVISORY
	https://ubuntu.com/security/notices/USN-5032-2	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-21284	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
          },
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "18.09.7-0ubuntu1~16.04.9+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@18.09.7-0ubuntu1~16.04.9+esm2?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.2~dfsg1-1ubuntu4",
        "1.10.2-0ubuntu3",
        "1.10.2-0ubuntu4",
        "1.10.3-0ubuntu1",
        "1.10.3-0ubuntu4",
        "1.10.3-0ubuntu5",
        "1.10.3-0ubuntu6",
        "1.11.2-0ubuntu5~16.04",
        "1.12.1-0ubuntu13~16.04.1",
        "1.12.3-0ubuntu4~16.04.2",
        "1.12.6-0ubuntu1~16.04.1",
        "1.13.1-0ubuntu1~16.04.2",
        "17.03.2-0ubuntu2~16.04.1",
        "18.06.1-0ubuntu1~16.04.2",
        "18.06.1-0ubuntu1.2~16.04.1",
        "18.09.2-0ubuntu1~16.04.1",
        "18.09.5-0ubuntu1~16.04.2",
        "18.09.7-0ubuntu1~16.04.1",
        "18.09.7-0ubuntu1~16.04.4",
        "18.09.7-0ubuntu1~16.04.5",
        "18.09.7-0ubuntu1~16.04.6",
        "18.09.7-0ubuntu1~16.04.7",
        "18.09.7-0ubuntu1~16.04.9+esm1",
        "18.09.7-0ubuntu1~16.04.9+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "20.10.7-0ubuntu1~18.04.1"
          },
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.7-0ubuntu1~18.04.1"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.7-0ubuntu1~18.04.1"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.7-0ubuntu1~18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@20.10.7-0ubuntu1~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "20.10.7-0ubuntu1~18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.13.1-0ubuntu6",
        "17.03.2-0ubuntu1",
        "17.03.2-0ubuntu3",
        "17.03.2-0ubuntu5",
        "17.12.1-0ubuntu1",
        "18.06.1-0ubuntu1~18.04.1",
        "18.06.1-0ubuntu1.2~18.04.1",
        "18.09.2-0ubuntu1~18.04.1",
        "18.09.5-0ubuntu1~18.04.2",
        "18.09.7-0ubuntu1~18.04.1",
        "18.09.7-0ubuntu1~18.04.3",
        "18.09.7-0ubuntu1~18.04.4",
        "19.03.6-0ubuntu1~18.04.1",
        "19.03.6-0ubuntu1~18.04.2",
        "19.03.6-0ubuntu1~18.04.3",
        "20.10.2-0ubuntu1~18.04.2",
        "20.10.2-0ubuntu1~18.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "20.10.7-0ubuntu1~20.04.1"
          },
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.7-0ubuntu1~20.04.1"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.7-0ubuntu1~20.04.1"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.7-0ubuntu1~20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@20.10.7-0ubuntu1~20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "20.10.7-0ubuntu1~20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "19.03.2-0ubuntu1",
        "19.03.6-0ubuntu1",
        "19.03.8-0ubuntu1",
        "19.03.8-0ubuntu1.20.04",
        "19.03.8-0ubuntu1.20.04.1",
        "19.03.8-0ubuntu1.20.04.2",
        "20.10.2-0ubuntu1~20.04.2",
        "20.10.2-0ubuntu1~20.04.3"
      ]
    }
  ],
  "aliases": [],
  "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/\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.",
  "id": "UBUNTU-CVE-2021-21284",
  "modified": "2025-09-08T16:46:57Z",
  "published": "2021-02-02T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-21284"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc"
    },
    {
      "type": "REPORT",
      "url": "https://docs.docker.com/engine/release-notes/#20103"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/moby/moby/releases/tag/v19.03.15"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/moby/moby/releases/tag/v20.10.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5032-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5032-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-21284"
    }
  ],
  "related": [
    "USN-5032-1",
    "USN-5032-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-21284"
  ]
}

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

Vulnerability from cvelistv5 – Published: 2021-02-02 17:55 – Updated: 2024-08-03 18:09

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

GitHub_M mitre root Scorecard

References

8 references

URL	Tags
https://docs.docker.com/engine/release-notes/#20103	x_refsource_MISC
https://github.com/moby/moby/releases/tag/v20.10.3	x_refsource_MISC
https://github.com/moby/moby/releases/tag/v19.03.15	x_refsource_MISC
https://github.com/moby/moby/security/advisories/…	x_refsource_CONFIRM
https://github.com/moby/moby/commit/64bd4485b3a66…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021022…	x_refsource_CONFIRM
https://www.debian.org/security/2021/dsa-4865	vendor-advisoryx_refsource_DEBIAN
https://security.gentoo.org/glsa/202107-23	vendor-advisoryx_refsource_GENTOO

Impacted products

1 product

Vendor	Product	Version
moby	moby	Affected: < 19.03.15 Affected: >= 20.0.0, < 20.10.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T18:09:15.042Z",
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          },
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        "title": "CVE Program Container"
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
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            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
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          "url": "https://github.com/moby/moby/releases/tag/v19.03.15"
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        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://security.netapp.com/advisory/ntap-20210226-0005/"
        },
        {
          "name": "DSA-4865",
          "tags": [
            "vendor-advisory",
            "x_refsource_DEBIAN"
          ],
          "url": "https://www.debian.org/security/2021/dsa-4865"
        },
        {
          "name": "GLSA-202107-23",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
          ],
          "url": "https://security.gentoo.org/glsa/202107-23"
        }
      ],
      "source": {
        "advisory": "GHSA-7452-xqpj-6rpc",
        "discovery": "UNKNOWN"
      },
      "title": "privilege escalation in Moby",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-21284",
          "STATE": "PUBLIC",
          "TITLE": "privilege escalation in Moby"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "moby",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 19.03.15"
                          },
                          {
                            "version_value": "\u003e= 20.0.0, \u003c 20.10.3"
                          }
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                },
                "vendor_name": "moby"
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        "data_format": "MITRE",
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        "description": {
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            {
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              "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."
            }
          ]
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        "impact": {
          "cvss": {
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            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
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            "integrityImpact": "HIGH",
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        "references": {
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            {
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            },
            {
              "name": "https://github.com/moby/moby/releases/tag/v20.10.3",
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            },
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            },
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              "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"
            },
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              "refsource": "MISC",
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            },
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              "name": "https://security.netapp.com/advisory/ntap-20210226-0005/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20210226-0005/"
            },
            {
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              "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"
            }
          ]
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        "source": {
          "advisory": "GHSA-7452-xqpj-6rpc",
          "discovery": "UNKNOWN"
        }
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  },
  "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"
}

USN-5032-1

Vulnerability from osv_ubuntu – Published: 2021-08-05 13:32 – Updated: 2026-02-10 04:42 – Source website

Summary

docker.io vulnerabilities

Details

Several vulnerabilities were fixed in Docker. This update provides a new upstream version that fixed them.

References

URL

Type

	https://ubuntu.com/security/notices/USN-5032-1	ADVISORY
	https://launchpad.net/bugs/1938908	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "20.10.7-0ubuntu1~18.04.1"
          },
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.7-0ubuntu1~18.04.1"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.7-0ubuntu1~18.04.1"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.7-0ubuntu1~18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@20.10.7-0ubuntu1~18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "20.10.7-0ubuntu1~18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.13.1-0ubuntu6",
        "17.03.2-0ubuntu1",
        "17.03.2-0ubuntu3",
        "17.03.2-0ubuntu5",
        "17.12.1-0ubuntu1",
        "18.06.1-0ubuntu1~18.04.1",
        "18.06.1-0ubuntu1.2~18.04.1",
        "18.09.2-0ubuntu1~18.04.1",
        "18.09.5-0ubuntu1~18.04.2",
        "18.09.7-0ubuntu1~18.04.1",
        "18.09.7-0ubuntu1~18.04.3",
        "18.09.7-0ubuntu1~18.04.4",
        "19.03.6-0ubuntu1~18.04.1",
        "19.03.6-0ubuntu1~18.04.2",
        "19.03.6-0ubuntu1~18.04.3",
        "20.10.2-0ubuntu1~18.04.2",
        "20.10.2-0ubuntu1~18.04.3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "docker.io",
            "binary_version": "20.10.7-0ubuntu1~20.04.1"
          },
          {
            "binary_name": "golang-docker-dev",
            "binary_version": "20.10.7-0ubuntu1~20.04.1"
          },
          {
            "binary_name": "golang-github-docker-docker-dev",
            "binary_version": "20.10.7-0ubuntu1~20.04.1"
          },
          {
            "binary_name": "vim-syntax-docker",
            "binary_version": "20.10.7-0ubuntu1~20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "docker.io",
        "purl": "pkg:deb/ubuntu/docker.io@20.10.7-0ubuntu1~20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "20.10.7-0ubuntu1~20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "19.03.2-0ubuntu1",
        "19.03.6-0ubuntu1",
        "19.03.8-0ubuntu1",
        "19.03.8-0ubuntu1.20.04",
        "19.03.8-0ubuntu1.20.04.1",
        "19.03.8-0ubuntu1.20.04.2",
        "20.10.2-0ubuntu1~20.04.2",
        "20.10.2-0ubuntu1~20.04.3"
      ]
    }
  ],
  "aliases": [],
  "details": "Several vulnerabilities were fixed in Docker. This update provides a new upstream version that fixed them.\n",
  "id": "USN-5032-1",
  "modified": "2026-02-10T04:42:17Z",
  "published": "2021-08-05T13:32:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5032-1"
    },
    {
      "type": "REPORT",
      "url": "https://launchpad.net/bugs/1938908"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "docker.io vulnerabilities",
  "upstream": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

UBUNTU-CVE-2021-21284 (CVE-2021-21284)

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

USN-5032-1

Tags

Sightings

Nomenclature

Related by attack behaviour