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TITLE:
MediaWiki AJAX UTF-7 Cross-Site Scripting

SECUNIA ADVISORY ID:
SA24211

VERIFY ADVISORY:
http://secunia.com/advisories/24211/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
MediaWiki 1.x
http://secunia.com/product/2546/

DESCRIPTION:
Moshe BA has reported a vulnerability in MediaWiki, which can be
exploited by malicious people to conduct cross-site scripting
attacks.

Input passed to the "rs" parameter in index.php (when "action" is set
to "ajax") is not properly sanitised from UTF-7 data before being
returned to the user. This can be exploited to execute arbitrary HTML
and script code in a user's browser session in context of an affected
site.

Successful exploitation requires that $wgUseAjax is set to true (not
default setting) and that the target user uses Internet Explorer with
encoding auto-detection enabled.

The vulnerability is related to:
SA23647

The vulnerability is reported in the 1.6.x branch before 1.6.10, the
1.7.x branch before 1.7.3, the 1.8.x branch before 1.8.4, and the
1.9.x branch before 1.9.3.

SOLUTION:
Update to version 1.6.10, 1.7.3, 1.8.4, or 1.9.3.

PROVIDED AND/OR DISCOVERED BY:
Moshe BA, BugSec LTD.

ORIGINAL ADVISORY:
BugSec LTD.:
http://www.bugsec.com/articles.php?Security=24

MediaWiki:
http://svn.wikimedia.org/viewvc/mediawiki/tags/REL1_9_3/phase3/RELEASE-NOTES?revision=20016

OTHER REFERENCES:
SA23647:
http://secunia.com/advisories/23647/

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