CVE-2020-10534 Privilege escalation in n/a

Critical 9.8 Published 12 Mar 2020 Updated 4 Aug 2024

Blocked users can regain escalated privileges due to flawed IP range evaluation in the GlobalBlocking extension when an IP is in multiple ranges.

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

What is CVE-2020-10534?

CVE-2020-10534 is a critical vulnerability in Mediawiki Mediawiki, published on 12 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the GlobalBlocking extension before 2020-03-10 for MediaWiki through 1.34.0, an issue related to IP range evaluation resulted in blocked users re-gaining escalated privileges. This is related to the case in which an IP address is contained in two ranges, one of which is locally disabled.

Weakness: CWE-863

Which versions are affected by CVE-2020-10534?

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

Package	Affected	Fixed in
`mediawiki` Bitnami	All versions	`1.34.1`

Products include Mediawiki Mediawiki.

How do I fix CVE-2020-10534?

Upgrade mediawiki to 1.34.1 or later.

Is CVE-2020-10534 being exploited?

There is no known exploitation of CVE-2020-10534 in the wild and no public exploit code.

All Mediawiki Mediawiki vulnerabilities

Sources

Also known as BIT-mediawiki-2020-10534, GHSA-rmqj-6c77-6qch.