Vulnerability identifier: #VU49103

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-35477

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 software fails to hide log entries under  certain conditions. A remote user can view the log entry and gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.35.0, 1.34 - 1.34.4, 1.33.0 - 1.33.4, 1.32.0 - 1.32.6, 1.31.0 - 1.31.10, 1.30.0 - 1.30.2

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External links
http://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
http://phabricator.wikimedia.org/T205908
http://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.