UBUNTU-CVE-2021-30159 (CVE-2021-30159)

Vulnerability from osv_ubuntu – Published: 2021-04-09 07:15 – Updated: 2026-05-27 10:01 – Source website
VLAI
Details

An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Users can bypass intended restrictions on deleting pages in certain "fast double move" situations. MovePage::isValidMoveTarget() uses FOR UPDATE, but it's only called if Title::getArticleID() returns non-zero with no special flags. Next, MovePage::moveToInternal() will delete the page if getArticleID(READ_LATEST) is non-zero. Therefore, if the page is missing in the replica DB, isValidMove() will return true, and then moveToInternal() will unconditionally delete the page if it can be found in the master.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mediawiki",
            "binary_version": "1:1.31.7-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "mediawiki-classes",
            "binary_version": "1:1.31.7-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "mediawiki",
        "purl": "pkg:deb/ubuntu/mediawiki@1:1.31.7-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.31.2-1ubuntu1",
        "1:1.31.5-1",
        "1:1.31.5-1ubuntu1",
        "1:1.31.5-2",
        "1:1.31.5-3",
        "1:1.31.5-3ubuntu1",
        "1:1.31.6-1",
        "1:1.31.7-1",
        "1:1.31.7-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mediawiki",
            "binary_version": "1:1.35.6-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "mediawiki-classes",
            "binary_version": "1:1.35.6-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "mediawiki",
        "purl": "pkg:deb/ubuntu/mediawiki@1:1.35.6-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.35.3-1",
        "1:1.35.4-1",
        "1:1.35.5-1",
        "1:1.35.5-1ubuntu1",
        "1:1.35.5-1ubuntu2",
        "1:1.35.5-1ubuntu3",
        "1:1.35.6-1",
        "1:1.35.6-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mediawiki",
            "binary_version": "1:1.39.7-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "mediawiki-classes",
            "binary_version": "1:1.39.7-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "mediawiki",
        "purl": "pkg:deb/ubuntu/mediawiki@1:1.39.7-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.39.4-2",
        "1:1.39.5-1",
        "1:1.39.6-1",
        "1:1.39.7-1",
        "1:1.39.7-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mediawiki",
            "binary_version": "1:1.43.3+dfsg-1"
          },
          {
            "binary_name": "mediawiki-classes",
            "binary_version": "1:1.43.3+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "mediawiki",
        "purl": "pkg:deb/ubuntu/mediawiki@1:1.43.3+dfsg-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.43.1+dfsg-1",
        "1:1.43.1+dfsg-2",
        "1:1.43.3+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mediawiki",
            "binary_version": "1:1.43.8+dfsg-2"
          },
          {
            "binary_name": "mediawiki-classes",
            "binary_version": "1:1.43.8+dfsg-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "mediawiki",
        "purl": "pkg:deb/ubuntu/mediawiki@1:1.43.8+dfsg-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.43.3+dfsg-1",
        "1:1.43.5+dfsg-1",
        "1:1.43.6+dfsg-2",
        "1:1.43.8+dfsg-1",
        "1:1.43.8+dfsg-2"
      ]
    }
  ],
  "aliases": [],
  "details": "An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Users can bypass intended restrictions on deleting pages in certain \"fast double move\" situations. MovePage::isValidMoveTarget() uses FOR UPDATE, but it\u0027s only called if Title::getArticleID() returns non-zero with no special flags. Next, MovePage::moveToInternal() will delete the page if getArticleID(READ_LATEST) is non-zero. Therefore, if the page is missing in the replica DB, isValidMove() will return true, and then moveToInternal() will unconditionally delete the page if it can be found in the master.",
  "id": "UBUNTU-CVE-2021-30159",
  "modified": "2026-05-27T10:01:53Z",
  "published": "2021-04-09T07:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-30159"
    },
    {
      "type": "REPORT",
      "url": "https://phabricator.wikimedia.org/T272386"
    },
    {
      "type": "REPORT",
      "url": "https://lists.wikimedia.org/pipermail/wikitech-l/2021-April/094418.html"
    },
    {
      "type": "REPORT",
      "url": "https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/49ce7dd2143d01cffd4dfd2f2af79b2b93672eac%5E%21/"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-30159"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-30159"
  ]
}



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