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TITLE:
MediaWiki Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA50477

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/50477/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=50477

RELEASE DATE:
2012-08-31

DISCUSS ADVISORY:
http://secunia.com/advisories/50477/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/50477/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=50477

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A weakness, two security issues and some vulnerabilities have been
reported in MediaWiki, which can be exploited by malicious users to
disclose potentially sensitive information and by malicious people to
conduct cross-site scripting, script insertion, and cross-site request
forgery attacks and bypass certain security restrictions.

1) Input passed via the comment of a "File:" tag to a non-existing
file is not properly sanitised before being used. This can be
exploited to insert arbitrary HTML and script code, which will be
executed in a user's browser session in context of an affected site
if malicious data is viewed.

2) Input passed via the "uselang" parameter to index.php is not
properly sanitised before being returned to the user via certain
gadgets. This can be exploited to execute arbitrary HTML and script
code in a user's browser session in context of an affected site.

3) The application allows users to perform certain actions HTTP
requests without performing proper validity checks to verify the
requests. This can be exploited to perform certain unspecified
actions when a logged-in user visits a specially crafted web page.

4) An error when handling IP address blocking of the GlobalBlocking
extension can be exploited to bypass the blocking mechanism and e.g.
create an account from a blocked address.

5) The application stores user credentials used via external
authentication plugins (e.g. LDAP extension) additionally in the
local database and can potentially be exploited to bypass the strict
function of an authentication plugin and log-in by using an old
password.

6) An error when handling the blocking of users can be exploited to
disclose the block reason via another block attempt.

Successful exploitation of this weakness requires administrative
privileges.

The weakness, security issues, and vulnerabilities are reported in
versions prior to 1.18.5 and prior to 1.19.2.

SOLUTION:
Update to version 1.18.5 or 1.19.2 and apply the vendor workaround in
case only external authentication is used (please see the vendor's
advisory for details).

PROVIDED AND/OR DISCOVERED BY:
1) Writ Keeper in a MediaWiki bug report.
2) Fomafix in a MediaWiki bug report.
3, 4, 5, and 6) Reported by the vendor.

ORIGINAL ADVISORY:
MediaWiki:
http://lists.wikimedia.org/pipermail/mediawiki-announce/2012-August/000119.html
https://www.mediawiki.org/wiki/Release_notes/1.18
https://www.mediawiki.org/wiki/Release_notes/1.19
https://bugzilla.wikimedia.org/show_bug.cgi?id=37587
https://bugzilla.wikimedia.org/show_bug.cgi?id=39180
https://bugzilla.wikimedia.org/show_bug.cgi?id=39184
https://bugzilla.wikimedia.org/show_bug.cgi?id=39700
https://bugzilla.wikimedia.org/show_bug.cgi?id=39823
https://bugzilla.wikimedia.org/show_bug.cgi?id=39824

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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