#VU40837 Cross-site scripting in MediaWiki - CVE-2015-2931

Vulnerability identifier: #VU40837

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-2931

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

Incomplete blacklist vulnerability in includes/upload/UploadBase.php in MediaWiki before 1.19.24, 1.2x before 1.23.9, and 1.24.x before 1.24.2 allows remote attackers to inject arbitrary web script or HTML via an application/xml MIME type for a nested SVG with a data: URI.

Mitigation
Install update from vendor's website.

Vulnerable software versions

MediaWiki: 1.20 - 1.24.1

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External links
https://www.mandriva.com/security/advisories?name=MDVSA-2015:200
https://www.openwall.com/lists/oss-security/2015/04/01/1
https://www.openwall.com/lists/oss-security/2015/04/07/3
https://www.securityfocus.com/bid/73477
https://lists.wikimedia.org/pipermail/mediawiki-announce/2015-March/000175.html
https://phabricator.wikimedia.org/T85850
https://security.gentoo.org/glsa/201510-05

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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.