CVE-2023-37303 Denial of service in n/a

Critical 9.8 Published 30 Jun 2023 Updated 27 Nov 2024

A bug in the MediaWiki CheckUser extension causes user blocking attempts to fail due to database errors, potentially disrupting administrative functions.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2023-37303?

CVE-2023-37303 is a critical denial of service vulnerability in Mediawiki Mediawiki, published on 30 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.

Weakness: CWE-754

Which versions are affected by CVE-2023-37303?

1 open source package ship an affected version, including mediawiki. It affects 1 product.

Package	Affected	Fixed in
`mediawiki` Bitnami	All versions	`1.39.4`

Products include Mediawiki Mediawiki.

How do I fix CVE-2023-37303?

Upgrade mediawiki to 1.39.4 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-37303 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37303 exists.

All Mediawiki Mediawiki vulnerabilities

Sources

Also known as BIT-mediawiki-2023-37303, GHSA-frhg-fmpg-fqp2, UBUNTU-CVE-2023-37303.