#VU40943 Permissions, Privileges, and Access Controls in MediaWiki - CVE-2014-9476

Vulnerability identifier: #VU40943

Vulnerability risk: Medium

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:Green]

CVE-ID: CVE-2014-9476

CWE-ID: CWE-264

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.

MediaWiki 1.2x before 1.22.15, 1.23.x before 1.23.8, and 1.24.x before 1.24.1 allows remote attackers to bypass CORS restrictions in $wgCrossSiteAJAXdomains via a domain that has a partial match to an allowed origin, as demonstrated by "http://en.wikipedia.org.evilsite.example/."

Mitigation
Install update from vendor's website.

Vulnerable software versions

MediaWiki: 1.20 - 1.24.0

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External links
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
https://phabricator.wikimedia.org/T77028

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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.