Vulnerability identifier: #VU54643

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-29483

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in the "wikiconfig" API. A remote attacker can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.36.0, 1.31.0 - 1.31.14, 1.35.0 - 1.35.2

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External links
http://github.com/miraheze/ManageWiki/security/advisories/GHSA-jmc9-rv2f-g8vv
http://phabricator.miraheze.org/T7213
http://github.com/miraheze/ManageWiki/commit/befb83c66f5b643e174897ea41a8a46679b26304

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.