#VU49104 Information disclosure in MediaWiki - CVE-2020-35480

Vulnerability identifier: #VU49104

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-35480

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 the way application handles missing and hidden user accounts. A remote attacker can expose sensitive information about the hidden status to unprivileged viewers.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.30.0 - 1.35.0

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External links
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
https://phabricator.wikimedia.org/T120883
https://www.debian.org/security/2020/dsa-4816

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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