Vulnerability CVE-2013-4304
Published: 2014-01-26

Description:
The CentralAuth extension for MediaWiki 1.19.x before 1.19.8, 1.20.x before 1.20.7, and 1.21.x before 1.21.2 caches a valid CentralAuthUser object in the centralauth_User cookie even when a user has not successfully logged in, which allows remote attackers to bypass authentication without a password.

Type:

CWE-287

 (Improper Authentication)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Mediawiki -> Mediawiki 
Brion vibber -> Centralauth extension 

 References:
http://lists.wikimedia.org/pipermail/mediawiki-announce/2013-September/000133.html
https://bugzilla.wikimedia.org/show_bug.cgi?id=52338
http://xforce.iss.net/xforce/xfdb/86894
http://secunia.com/advisories/54723
http://seclists.org/oss-sec/2013/q3/553
http://osvdb.org/96910
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