vulnerability
MediaWiki: Unspecified Security Vulnerability (CVE-2021-30159)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:L/Au:S/C:N/I:P/A:N) | Apr 9, 2021 | Apr 21, 2021 | Nov 26, 2024 |
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.
Solution(s)
References
- CVE-2021-30159
- https://attackerkb.com/topics/CVE-2021-30159
- URL-https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
- URL-https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
- URL-https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/26UJGHF7LJDOCQN6A3Z4PM7PYRKENJHE/
- URL-https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2OMSV7B2TCFBOCICN3B4SMQP5HVRJQIT/
- URL-https://phabricator.wikimedia.org/T272386
- URL-https://security.gentoo.org/glsa/202107-40
- URL-https://www.debian.org/security/2021/dsa-4889
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