CVE-2021-30159
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-30159
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 1.35.2-1 | |
| debian | bookworm | fixed | 1:1.35.2-1 |
| debian | bullseye | fixed | 1:1.35.2-1 |
| debian | forky | fixed | 1:1.35.2-1 |
| debian | sid | fixed | 1:1.35.2-1 |
| debian | trixie | fixed | 1:1.35.2-1 |
References
Verify integrity in audit chain (admin only). AS-IS.