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PHP-Nuke <= 7.9 Search module "author" SQL Injection vulnerability

Description

/* -------------------------------------------------------- [N]eo [S]ecurity [T]eam [NST] - Advisory 28 - 2006-10-25 -------------------------------------------------------- Program: PHP-Nuke Homepage: http://www.php.net Vulnerable Versions: PHP-Nuke <= 7.9 Risk: Medium Impact: Medium Risk -==PHP-Nuke <= 7.9 Search module "author" SQL Injection vulnerability==- --------------------------------------------------------- - 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 --------------------------------------------------------- In /modules/Search/index.php the "author" variable is not sanitized correctly. Here is the vulnerable code: ==[ /modules/Search/index.php 196-198 ]========================== [...] if (!empty($author)) $q .= "AND s.aid='$author' "; if (!empty($topic)) $q .= "AND s.topic='$topic' "; if (!empty($days) && $days!=0) $q .= "AND TO_DAYS(NOW()) - TO_DAYS(time) <= '$days' "; [...] ==[ end /modules/Search/index.php ]============================== Register_globals php directive must be turned Off so the simple quotes (') are not filtered. Also we have to know the prefix used for the database tables ("nuke_" by default). In this way, bypassing the SQL Injection Protection, like using someone like '/**/UNION ' and not ' UNION ' in our sql injections, we can get the admin md5 hash without any problems. ==Pseudo-Code Proof of Concept exploit== <? /* Neo Security Team - Pseudo-Code Proof of Concept Exploit http://www.neosecurityteam.net Paisterist */ set_time_limit(0); $host="localhost"; $path="/phpnuke/"; $port="80"; $fp = fsockopen($host, $port, $errno, $errstr, 30); $data=""; /* Here the variables, like "query", "topic" and "author" with the SQL Injection */ if ($fp) { /* we put the POST request on $p variable, sending the data saved on $data. */ fwrite($fp, $p); while (!feof($fp)) { $content .= fread($fp, 4096); } preg_match("/([a-zA-Z0-9]{32})/", $content, $matches); if ($matches[0]) print "<b>Hash: </b>".$matches[0]; } ?> ==Pseudo-Code Proof of Concept exploit== Whit this PoC code i get the md5 hash of the first admin (God) of the nuke_authors table. - How to fix it? More information? -------------------------------------------------------- You can found a patch on http://www.neosecurityteam.net/foro/ Also, you can modify the line 197 of /modules/Search/index.php, adding slashes before the simple quotes with the addslashes() function: ==[ /modules/Search/index.php 196-198 ]========================== [...] if (!empty($author)) $q .= "AND s.aid='$author' "; if (!empty($topic)) $q .= "AND s.topic='" . addslashes($topic) . "' "; if (!empty($days) && $days!=0) $q .= "AND TO_DAYS(NOW()) - TO_DAYS(time) <= '$days' "; [...] ==[ end /modules/Search/index.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=28 - Credits -------------------------------------------------------- Search module SQL Injection discovered by Paisterist -> paisterist[dot]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 */