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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-04-09T06:12:55

Updated: 2024-08-03T22:24:59.632Z

Reserved: 2021-04-06T00:00:00

Link: CVE-2021-30159

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-04-09T07:15:16.277

Modified: 2023-11-07T03:32:59.850

Link: CVE-2021-30159

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-04-08T00:00:00Z

Links: CVE-2021-30159 - Bugzilla