Multiple vulnerabilities have been reported in MediaWiki, which can be exploited by malicious people to conduct cross-site scripting attacks and bypass certain security restrictions.
1) The application does not properly prevent certain browsers (e.g. Internet Explorer 6) from guessing the content type based on the ending of the query URL, which can be exploited to inject and execute arbitrary HTML and script code in a user's browser session in context of an affected site.
2) Certain input passed via CSS comments is not properly sanitised by the wikitext parser before being displayed to the user. 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 when the malicious data is being viewed.
3) The transwiki import feature does not properly restrict access on form submissions, which can be exploited to perform e.g. unauthorised, remote imports from certain sources.
Successful exploitation of this vulnerability requires that the transwiki import feature is enabled (disabled by default).
4) An error in the "User::loadFromSession()" method (includes/User.php) when checking the "wikiUserID" cookie value can be exploited to impersonate e.g. an administrative user by supplying a valid identifier for that user.
Successful exploitation of this vulnerability requires that "$wgBlockDisablesLogin" is set to "true" in LocalSettings.php.
Vulnerabilities #1 and #4 are reported in versions prior to 1.16.5. Vulnerabilities #2 and #3 are reported in versions prior to 1.16.4.
Solution: Update to version 1.16.5.
Provided and/or discovered by: 1) The vendor credits Masato Kinugawa.
2) The vendor credits Suffusion of Yellow.
3) Reported by the vendor.
4) The vendor credits Liangent.
Original Advisory: MediaWiki:
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Subject: MediaWiki Multiple Vulnerabilities
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