CVE-2021-30159

First published: Fri Apr 09 2021(Updated: )

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.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
debian/mediawiki		1:1.31.16-1+deb10u2 1:1.31.16-1+deb10u6 1:1.35.11-1~deb11u1 1:1.35.13-1~deb11u1 1:1.39.4-1~deb12u1 1:1.39.5-1~deb12u1 1:1.39.5-1
MediaWiki MediaWiki	<1.31.12
MediaWiki MediaWiki	>=1.32.0<1.35.2
Debian Debian Linux	=9.0
Debian Debian Linux	=10.0
Fedoraproject Fedora	=33
Fedoraproject Fedora	=34

Remedy

https://phabricator.wikimedia.org/T272386

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