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.
How to fix
- mediawiki mediawiki1.31.12, 1.35.2 or later
- debian.org/security/2021/dsa-4889
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/26UJGHF7LJDOCQN6A3Z4PM7PYRKENJHE/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2OMSV7B2TCFBOCICN3B4SMQP5HVRJQIT/
- security.gentoo.org/glsa/202107-40
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mediawiki mediawiki | v < 1.31.12, 1.32.0 ≤ v < 1.35.2 | 1.31.12, 1.35.2 |
| debian debian_linux | 9.0, 10.0 | — |
| fedoraproject fedora | 33, 34 | — |
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