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Multiple Extensions Vulnerability in MediaWiki
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SUMMARY
<http://wikipedia.sourceforge.net/> MediaWiki is one of famous wiki web
applications. However, an input validation flaw in MediaWiki can cause
malicious attackers to run arbitrary commands with the privilege of the
HTTPD process, which is typically run as the nobody user.
DETAILS
Vulnerable Systems:
* MediaWiki 1.3.8 and prior
Immune Systems:
* MediaWiki 1.3.9 or newer
MediaWiki did not implement any type of check for multiple extensions of
uploaded files, e.g. attack.php.rar. Therefore, a malicious attackers can
upload arbitrary script files (PHP, pl, CGI, etc) to a web server and then
execute them.
The vulnerability originates from the feature of Apache's MIME module
(mod_mime), which regards attack.php.rar as a normal PHP file and executes
the file through mod_php module with the privilege of the HTTPD process.
Disclosure Timeline:
2004-12-10 Vulnerability found.
2004-12-10 MediaWiki developer notified
2004-12-13 Update version released
2004-12-15 Official release
ADDITIONAL INFORMATION
The information has been provided by <mailto:advisory@stgsecurity.com>
SSR Team.
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