Vulnerability identifier: #VU37967

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-2017-8810

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS
Debian Linux
Operating systems & Components / Operating system

Vendor: MediaWiki.org
Debian

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2, when a private wiki is configured, provides different error messages for failed login attempts depending on whether the username exists, which allows remote attackers to enumerate account names and conduct brute-force attacks via a series of requests.

Mitigation
Install update from vendor's website.

Vulnerable software versions

MediaWiki: 1.28.0 - 1.28.2, 1.29.0 - 1.29.1

Debian Linux: 1.28.0 - 9.0

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External links
http://www.securitytracker.com/id/1039812
http://lists.wikimedia.org/pipermail/mediawiki-announce/2017-November/000216.html
http://www.debian.org/security/2017/dsa-4036

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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.