#VU40944 Cross-site scripting in MediaWiki - CVE-2014-9475

Vulnerability identifier: #VU40944

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2014-9475

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

Vulnerability allows a remote attacker to perform XSS attacks.

The vulnerability is caused by an input validation error in thumb.php in MediaWiki before 1.19.23, 1.2x before 1.22.15, 1.23.x before 1.23.8, and 1.24.x before 1.24.1. A remote authenticated attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in victim's browser in security context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

MediaWiki: 1.20 - 1.24.0

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External links
https://www.debian.org/security/2014/dsa-3110
https://www.mandriva.com/security/advisories?name=MDVSA-2015:006
https://www.openwall.com/lists/oss-security/2014/12/21/2
https://www.openwall.com/lists/oss-security/2015/01/03/13
https://lists.wikimedia.org/pipermail/mediawiki-announce/2014-December/000173.html

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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.