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CVE-2021-30159

Published: 9 April 2021

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.

Priority

Medium

Cvss 3 Severity Score

4.3

Score breakdown

Status

Package Release Status
mediawiki
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Needed

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needed

kinetic Ignored
(end of life, was needed)
lunar Ignored
(end of life, was needed)
mantic Needed

trusty Does not exist

upstream
Released (1:1.35.2-1)
xenial Does not exist

Severity score breakdown

Parameter Value
Base score 4.3
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N