CVE-2021-41800 MediaWiki allows a denial of service
Attackers can cause denial of service in MediaWiki by triggering long-running SQL queries via Special:Contributions due to mishandled PoolCounter protection.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-41800?
CVE-2021-41800 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 11 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
MediaWiki before 1.36.2 allows a denial of service (resource consumption because of lengthy query processing time). Visiting Special:Contributions can sometimes result in a long running SQL query because PoolCounter protection is mishandled.
Weakness: CWE-770
Which versions are affected by CVE-2021-41800?
3 open source packages ship an affected version, including mediawiki/core and mediawiki. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki/core Packagist | All versions | 1.36.2 |
mediawiki/core Packagist | All versions | 1.36.2 |
mediawiki Bitnami | All versions | 1.36.2 |
Products include Fedoraproject Fedora, Mediawiki Mediawiki.
How do I fix CVE-2021-41800?
Upgrade mediawiki/core to 1.36.2 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-2021-41800 being exploited?
There is no known exploitation of CVE-2021-41800 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as BIT-mediawiki-2021-41800, DEBIAN-CVE-2021-41800, GHSA-c8wv-qwwc-6j73, UBUNTU-CVE-2021-41800.