ubuntu-cve-2021-4122
Vulnerability from osv_ubuntu
Published
2022-01-13 00:00
Modified
2026-04-22 07:39
Summary
Details

It was found that a specially crafted LUKS header could trick cryptsetup into disabling encryption during the recovery of the device. An attacker with physical access to the medium, such as a flash disk, could use this flaw to force a user into permanently disabling the encryption layer of that medium.

Severity
5.9 (Medium)
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
4.3 (Medium)
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "cryptsetup",
            "binary_version": "2:2.2.2-3ubuntu2.4"
          },
          {
            "binary_name": "cryptsetup-bin",
            "binary_version": "2:2.2.2-3ubuntu2.4"
          },
          {
            "binary_name": "cryptsetup-initramfs",
            "binary_version": "2:2.2.2-3ubuntu2.4"
          },
          {
            "binary_name": "cryptsetup-run",
            "binary_version": "2:2.2.2-3ubuntu2.4"
          },
          {
            "binary_name": "libcryptsetup12",
            "binary_version": "2:2.2.2-3ubuntu2.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "cryptsetup",
        "purl": "pkg:deb/ubuntu/cryptsetup@2:2.2.2-3ubuntu2.4?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:2.2.2-3ubuntu2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:2.2.0-3ubuntu1",
        "2:2.2.1-1ubuntu1",
        "2:2.2.2-1ubuntu1",
        "2:2.2.2-2ubuntu1",
        "2:2.2.2-3ubuntu1",
        "2:2.2.2-3ubuntu2",
        "2:2.2.2-3ubuntu2.2",
        "2:2.2.2-3ubuntu2.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "cryptsetup",
            "binary_version": "2:2.4.3-1ubuntu1"
          },
          {
            "binary_name": "cryptsetup-bin",
            "binary_version": "2:2.4.3-1ubuntu1"
          },
          {
            "binary_name": "cryptsetup-initramfs",
            "binary_version": "2:2.4.3-1ubuntu1"
          },
          {
            "binary_name": "cryptsetup-run",
            "binary_version": "2:2.4.3-1ubuntu1"
          },
          {
            "binary_name": "cryptsetup-suspend",
            "binary_version": "2:2.4.3-1ubuntu1"
          },
          {
            "binary_name": "libcryptsetup12",
            "binary_version": "2:2.4.3-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "cryptsetup",
        "purl": "pkg:deb/ubuntu/cryptsetup@2:2.4.3-1ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:2.4.3-1ubuntu1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:2.3.6-0ubuntu1",
        "2:2.4.2-1ubuntu3",
        "2:2.4.2-1ubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "It was found that a specially crafted LUKS header could trick cryptsetup into disabling encryption during the recovery of the device. An attacker with physical access to the medium, such as a flash disk, could use this flaw to force a user into permanently disabling the encryption layer of that medium.",
  "id": "UBUNTU-CVE-2021-4122",
  "modified": "2026-04-22T07:39:51Z",
  "published": "2022-01-13T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-4122"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2022/01/13/2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5286-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-4122"
    }
  ],
  "related": [
    "USN-5286-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-4122"
  ]
}



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