#VU23832 Permissions, Privileges, and Access Controls in MediaWiki - CVE-2019-19709

Vulnerability identifier: #VU23832

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-19709

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability allows attackers to bypass the Title_blacklist protection mechanism by starting with an arbitrary title, establishing a non-resolvable redirect for the associated page, and using redirect=1 in the action API when editing that page.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.33.0 - 1.33.1

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External links
https://gerrit.wikimedia.org/r/q/Ie54f366986056c876eade0fcad6c41f70b8b8de8
https://phabricator.wikimedia.org/T239466
https://www.debian.org/security/2019/dsa-4592

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.