CVE-2021-31556 Denial of service in n/a
Attackers can cause denial of service by submitting RSA keys too large for the database, affecting MediaWiki OAuth extension users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-31556?
CVE-2021-31556 is a critical denial of service vulnerability in Fedoraproject Fedora, published on 12 Aug 2021. 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 Oauth extension for MediaWiki through 1.35.2. MWOAuthConsumerSubmitControl.php does not ensure that the length of an RSA key will fit in a MySQL blob.
Weakness: CWE-1284
Which versions are affected by CVE-2021-31556?
1 open source package ship an affected version, including mediawiki. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki Bitnami | All versions | 1.35.3 |
Products include Fedoraproject Fedora, Mediawiki Mediawiki.
How do I fix CVE-2021-31556?
Upgrade mediawiki to 1.35.3 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-2021-31556 being exploited?
There is no known exploitation of CVE-2021-31556 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as BIT-mediawiki-2021-31556, GHSA-qm9m-9cq9-7p3v.