UBUNTU-CVE-2021-30159

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    UBUNTU-CVE-2021-30159

    Published: 9 Apr 2021Last Modified: 27 May 2026
    Upstream:
    CVE-2021-30159

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2021-30159, https://phabricator.wikimedia.org/T272386, https://lists.wikimedia.org/pipermail/wikitech-l/2021-April/094418.html, https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/49ce7dd2143d01cffd4dfd2f2af79b2b93672eac%5E%21/, https://www.cve.org/CVERecord?id=CVE-2021-30159

    Affected packages

    Package

    Name: mediawiki

    Purl: pkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps%2Ffocal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1:1.31.2-1ubuntu1
    1:1.31.5-1
    1:1.31.5-1ubuntu1
    1:1.31.5-2
    1:1.31.5-3
    1:1.31.5-3ubuntu1
    1:1.31.6-1
    1:1.31.7-1
    1:1.31.7-1ubuntu0.1~esm1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-30159 | CVE-DB