######################################################### Exploit Title : Mybb 1.6.8 Cross Site Scripting Author : 3xpl0!t3r Discovered By : Sec-Advisor.Org Date : 12 Oct 2012 Home : http://Sec-Advisor.Org ######################################################### Source : http://www.mybb.com/download/latest file : /inc/class_error.php 510: echo echo << {$mybb->settings['bbname']} - Internal Error

MyBB

{$title}

{$error_message}

EOF; 508: $_SERVER['PHP_SELF'] = htmlspecialchars_uni($_SERVER['PHP_SELF']); 406: $title = "MyBB Internal Error"; // if($type == MYBB_SQL) else , 391: $title = "MyBB SQL Error"; // if($type == MYBB_SQL), 489: $error_message .= "\n"; // if($type == MYBB_SQL) else , if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), 487: $error_message .= "

Backtrace:

{$backtrace}

\n"; // if($type == MYBB_SQL) else , if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), if($backtrace && !in_array($type, $this->mybb_error_types)), 481: $error_message .= "

Code:

{$code}

\n"; // if($type == MYBB_SQL) else , if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), if(!empty($file)), if(!preg_match('#config\.php|settings\.php#', $file) && file_exists($file)), 415: $error_message .= "

Location:

File: {$file}
Line: {$line}

Error Message:

{$message}

Error Type:

{$this->error_types[$type]} ($type)

MyBB has experienced an internal error and cannot continue.

"; // if($type == MYBB_SQL) else , 401: $error_message .= "\n"; // if($type == MYBB_SQL), if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), 399: $error_message .= "

Query:

{$message['query']}

\n"; // if($type == MYBB_SQL), if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), if($message != ""), 396: $error_message .= "

SQL Error:

{$message['error_no']} - {$message['error']}

MyBB has experienced an internal SQL error and cannot continue.

"; // if($type == MYBB_SQL), 392: $error_message = "

MyBB has experienced an internal SQL error and cannot continue.

"; // if($type == MYBB_SQL), 380: ⇓ function output_error($type, $message, $file, $line) 380: ⇓ function output_error($type, $message, $file, $line) 380: ⇓ function output_error($type, $message, $file, $line) 380: ⇓ function output_error($type, $message, $file, $line) 380: ⇓ function output_error($type, $message, $file, $line) 380: ⇓ function output_error($type, $message, $file, $line) 380: ⇓ function output_error($type, $message, $file, $line) 380: ⇓ function output_error($type, $message, $file, $line) 478: $code = nl2br($code); // if($type == MYBB_SQL) else , if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), if(!empty($file)), if(!preg_match('#config\.php|settings\.php#', $file) && file_exists($file)), if($parser_exists) else , 474: $code = $parser->mycode_parse_php ($code, true); // if($type == MYBB_SQL) else , if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), if(!empty($file)), if(!preg_match('#config\.php|settings\.php#', $file) && file_exists($file)), if($parser_exists), 451: $code .= $line + 3 . ". " . $code_pre[$line+2]; // if($type == MYBB_SQL) else , if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), if(!empty($file)), if(!preg_match('#config\.php|settings\.php#', $file) && file_exists($file)), if(isset($code_pre)), 446: $code .= $line + 2 . ". " . $code_pre[$line+1]; // if($type == MYBB_SQL) else , if($mybb->settings['errortypemedium'] == "both" || $mybb->settings['errortypemedium'] == "error" || defined("IN_INSTALL") || defined("IN_UPGRADE")), if(!empty($file)), if(!preg_match('#config\.php|settings\.php#', $file) && file_exists($file)), if(isset($code_pre)), requires: 502: if(!headers_sent() && !defined("IN_INSTALL") && !defined("IN_UPGRADE")) 380: ⇓ function output_error($type, $message, $file, $line) ######################################################### vulnerability concept: $_GET + echo() = Cross Site Scripting vulnerability description: An attacker might execute arbitrary HTML/JavaScript Code in the clients browser context with this security vulnerability. User tainted data is embedded into the HTML output by the application and rendered by the users browser, thus allowing an attacker to embed and render malicious code. Preparing a malicious link will lead to an execution of this malicious code in another users browser context when clicking the link. This can lead to local website defacement, phishing or cookie stealing and session hijacking. ######################################################### Exploit : #!/usr/bin/php -f ######################################################### D3m0 : www.lurkerlounge.com/forums/inc/class_error.php http://www.spyrax.net/forums/inc/class_error.php ######################################################### We are : 3xpl0!t3r | IR313 | ICA Tnx Of : Nafsh