CVE-2022-34750 Denial of service in n/a
Attackers can create oversized Wikibase lexemes due to missing length validation, causing denial of service in MediaWiki installations using Wikibase extensions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-34750?
CVE-2022-34750 is a high-severity denial of service vulnerability in Mediawiki Mediawiki, published on 28 Jun 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.
Weakness: CWE-770
Which versions are affected by CVE-2022-34750?
1 open source package ship an affected version, including mediawiki. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki Bitnami | All versions | 1.38.2 |
Products include Mediawiki Mediawiki.
How do I fix CVE-2022-34750?
Upgrade mediawiki to 1.38.2 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-2022-34750 being exploited?
There is no known exploitation of CVE-2022-34750 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as BIT-mediawiki-2022-34750, GHSA-vh8m-7c3c-7m5c.