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int power(long base, long exponent) {
= Abstract =
    int counter;
    int result = 1;
This article will be concerned about one of the common hacking methods in recent decades or even nowadays it is still being used by attackers. Its named Local Attack, this name is not the international official name for it. It was called by many Vietnamese Hackers, by somehow I realized it's quite good to describe partly of this attack method, so I'd like to take this name to be " our speaking" at least in this article. "This name is not available in google if you type by English "      
    for (counter = 0; counter < exponent; counter++)
        result *= base;
     return result;
}




I will illustrate the definition of Local Attack as well as the difficulties we will be suffered when we apply it beside its powerful. I will be talking detail step by step belongs with the certain knowledge what we need to know basically to do much straightforwardly and more understand its purpose. The knowledge requirement will be not hard to stop you getting the most powerful of hacking such as Web App, Linux command lines, Networking, etc.


/* When processor enters the function body the arguments are already placed in registers r0=5 (base), r1=3 (exponent) */
Because of the security of our website and server, I will not show the php shell link in this article. I apologize for this inconvenient. 


cmp r1, #0                        /* Compare exponent to 0 */
mov r2, #1                        /* Place constant 1 in register r2,
                                    this corresponds to result = 1 in C code */
ble .L2                          /* Exponent was not less than 0, so no jump to L2
mov r3, #0                        /* Place constant 0 in register r3,
                                    this corresponds to variable counter */


add r3, r3, #1                    /* Perform r3 = 0 + 1 which results in 1 being stored to r3
Keywords : ''Hacking, Local attack ,Linux , Web App.''
                                    this corresponds to first invocation of counter++ in C code */
cmp r3, r1                        /* Compare counter (1 in this case) to exponent (3), this will be used by bne instruction below */
mul r2, r0, r2                    /* Perform r2 = r0 * r2 which results in 1 * 5 = 5 being placed in r2
                                    this corresponds to first invocation of result *= base in C code */
bne .L3                          /* The comparison resulted in counter being not equal to exponent, so we jump back to L3
                                    this corresponds to first invocation of counter < exponent in C code */


add r3, r3, #1                    /* Perform r3 = 1 + 1 which results in 2 being stored to r3
[['''''!!! This article is served for education purpose only, I will not responsibility for any harm made by other ones !!!''''']]
                                    this corresponds to second invocation of counter++ in C code */
cmp r3, r1                        /* Compare counter (2 in this case) to exponent (3), this will be used by bne instruction below */
mul r2, r0, r2                    /* Perform r2 = r0 * r2 which results 5 * 5 = 25 being placed in r2
                                    this corresponds to second invocation of result *= base in C code */
bne .L3                          /* The comparison resulted in counter being not equal to exponent, so we jump back to L3
                                    this corresponds to second invocation of counter < exponent in C code */


add r3, r3, #1                    /* Perform r3 = 2 + 1 which results in 3 being stored to r3
= Local Attack Introduction=
                                    this corresponds to third invocation of counter++ in C code */
cmp r3, r1                        /* Compare counter (3 in this case) to exponent (3), this will be used by bne instruction below */
mul r2, r0, r2                    /* Perform r2 = r0 * r2 which results 25 * 5 = 125 being placed in r2
                                    this corresponds to third invocation of result *= base in C code */
bne .L3                          /* The comparison resulted in counter being equal to exponent, so we DO NOT jump back to L3 */


mov r0, r2                    /* Copy register r2 contents (125) to register r0 */
==What is Local Attack?==
bx lr                        /* Jump back to caller */
/* Function returns with 125 placed in r0 this is where caller function should expect the return value */
/* The other registers will still hold whatever values were left there: r1 = 3, r2 = 125, r3 = 3 */
 


== Storage abstractions ==
In generally, once we host the website to server, after that the user will be provided an " user account" and the directory/folder to mange their website. For instance, the first user has a website "A" and one directory/folder : /home/user1 to manage first user Similarly, the second user has a website "B" and one directory/folder /home/user2 to manage.


Local attack is the method which is applied to hack a website in the same server. For example, I want to attack website "A" from user 1, but unfortunately I could not find out the vulnerabilities to exploit and get an lien from it that means I have no way to attack based on this site "A". So, I will look for the websites which are being on the same server  with "A", could be website "B" or "C".


 What is a block device?
Based on site "B" or "C" both of them are getting some vulnerabilities or another words is " hackable ". After getting the authorities on these site "B" or "C", I will upload the php file named " Shell " to the server of "B" or "C" it's also the server of website "A". The hacking process is starting from now.....


 In computing (specifically data transmission and data storage), a block, sometimes called a physical record, is a sequence of bytes or bits, usually containing some whole number of records, having a maximum length, a block size.[1] Data thus structured are said to be blocked. The process of putting data into blocks is called blocking, while deblocking is the process of extracting data from blocks. Blocked data is normally stored in a data buffer and read or written a whole block at a time.  
                                          [[File:Local1.png]]
                                                                    ''Firgure 1: Php shell was uploaded to host of the website.''


 What is logical block addressing and what are the benefits compared to older cylinder-head-sector addressing method in terms of harddisks?
==Pros and Cons of Local Attack==


Logical block addressing (LBA) is a common scheme used for specifying the location of blocks of data stored on computer storage devices, generally secondary storage systems such as hard disk drives. LBA is a particularly simple linear addressing scheme; blocks are located by an integer index, with the first block being LBA 0, the second LBA 1, and so on.
'''Pros:'''
Cylinder-head-sector, also known as CHS, is an early method for giving addresses to each physical block of data on a hard disk drive. In the case of floppy drives, for which the same exact diskette medium can be truly low-level formatted to different capacities, this is still true.
      *Does not take a lot of time.
 What is a disk partition?
      *Easy to interact with the server via shell and exploit it.
Disk partitioning is the creation of one or more regions on a hard disk or other secondary storage, so that an operating system can manage information in each region separately.[1] Partitioning is typically the first step of preparing a newly manufactured disk, before any files or directories have been created
 
 What is a file system?
'''Cons:'''
In computing, a file system (or filesystem) is used to control how data is stored and retrieved. Without a file system, information placed in a storage area would be one large body of data with no way to tell where one piece of information stops and the next begins. By separating the data into individual pieces, and giving each piece a name, the information is easily separated and identified. Taking its name from the way paper-based information systems are named, each group of data is called a "file". The structure and logic rules used to manage the groups of information and their names is called a "file system".
      *Leave the " mark ", The administrator would be able to find where the shell comes from.
 What is journaling in terms of filesystems and what are the benefits? Name some journaled filesystems in use nowadays.
      *If the websites are using separate server, Local Attack will be gotten some certain difficult.
A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the intentions of such changes in a data structure known as a "journal", which is usually a circular log. In the event of a system crash or power failure, such file systems can be brought back online quicker with lower likelihood of becoming corrupted
 
In the Linux operating system, JFS is supported with the kernel module (since the kernel version 2.4.18pre9-ac4) and the complementary userspace utilities packaged under the name JFSutils. Most Linux distributions support JFS, unless it is specifically removed due to space restrictions or other concerns.
=What we need to know?=
==Host and Shared-Host==
Normally for web site, its data must be stored on one server (server) is always active and connected to the internet. Storage space on the server used to store the data of the website is called the host. For a number of agencies and organizations, the hired one server for data storage is not practical website. Due to their needs is simply stored, further 1 server rental price is not cheap. Therefore, shared hosting is a reasonable choice. With shared hosting, server memory space is divided into many small hosts, and are separate from each rental. So on one server will contain data for multiple websites, and there is also a source of security for developing local attack.
==Operating System and Decentralized system==
 
The Operating system of the server must be Linux
 
'''Unlike Windows, Linux operating system has a decentralized system is complicated and strict. Linux supports three permissions to do with files :'''
 
 
r: read access (read)
 
w: right to record (write)
 
x: right to execute (execute)
 
-: not allowed
 
 
'''These rights are assigned to three subjects:'''
 
 
u: owner (owner)
 
g: group ownership (group)
 
o: the ordinary users (other)
 
 
 
''You can read more here: http://linuxcommand.org/lts0070.php''
 
==Shell==
 
Simply put, the shell is a program that takes your commands from the keyboard and gives them to the operating system to perform. In the old days, it was the only user interface available on a Unix computer. Nowadays, we have graphical user interfaces (GUIs) in addition to command line interfaces (CLIs) such as the shell.
 
On most Linux systems a program called bash (which stands for Bourne Again SHell, an enhanced version of the original Bourne shell program, sh, written by Steve Bourne) acts as the shell program. There are several additional shell programs available on a typical Linux system. These include: ksh, tcsh and zsh.
 
In this tutorial, I will use the shell php named: '''Shell r57 or c99'''. You can download it on google
 
See more here:
 
-http://linuxcommand.org/lts0010.php
 
-http://linuxcommand.org/learning_the_shell.php
 
''*I recommend you use those shells or download it in virtual machines .''
 
=How to do Local attack step by step ?=
 
1. View the list of user in server
 
2. Find the config.php file
 
3. Get the login information to database
 
4. Crack and change the password of admin
 
5. Login and upload the shell
 
==View the list of user in server==
 
If we want to local attack a website as I mentioned before, we need to know the users on the server and which sources it is? . After that , we have able to read the config.php file of the user
 
The command line to get the user:
 
cat /etc/passwd
 
Some cases, If the above command line does not show the user list, we could try this:
 
ls -l /home/
 
If the server ban to cat the passwd, use could use these command lines:
 
less /etc/passwd
./cat/etc/passwd
 
==Find the path file config.php==
 
Depending on the sources the path file will set be default like this:
''Note: Path is the path locates from server to the site''
 
-With linux:
/home/user/public_html
Or other
 
-Joomla:
 
path/configuration.php
 
-Word-Press:
 
path/wp-config.php
 
 
 
This is the default path of those type of servers it's being used. It might be changed depended on Administrators (This is mainly due to the habits of programmers ).
 
(To search for the source path, search by keywords: "cwd", we will see similar code: "require_once (CWD. '/includes/init.php');" - This is the path defaults resulting init.php file)) ......
 
==Get the information from config file==
''This is the most difficult step of the method''
 
===The basic command lines using for Local Attack===
 
-ls, dir: List the names of the files inside the folder
ls -al, ls -lia: List the names and attributes of files inside the folder 
 
  ls -lia "/home/lphanvan/public_html/@ender/includes.config.php"
 
-sand, ./cat, less, more, tail: View contents inside the file:
 
  cat "/home/lphanvan/public_html/@ender/includes/config.php"
 
-ln: Command symbolic link:
 
  ln -s "/home/lphanvan/public_html/@ender/includes/config.php%20ender.ini"
 
-cd: Convert directory
 
 
For example, to navigate to the folder
 
  cd / home / lphanvan/ public_html / @ender/ includes / itcollege
 
  cd ~: Go to Facebook's home directory
 
 
 
-chmod: Distribution rights for files or folders:
 
  chmod 400 config.php (working in the directory where the file includes config.php)
 
-mkdir: create directory:
 
 
For me, I want to create a folder in the directory includes: 
 
  mkdir / home / lphanvan/ public_html / @ ender/ includes / itcollege
 
-touch: Create file:
 
  touch /home/lphanvan/public_html/@ender/includes/itcollege.php
 
-tar, tip: compress and uncompress command: often used in root symlink 
 
  tar -zcvf enderhacked.tar.gz soleil (Compressed file folder enderhacked.tar.gz ender)
 
  tar -zxvf enderhacked.tar.gz (unzip files enderhacked.tar.gz)
 
See more here: http://linuxcommand.org/lts0070.php
 
===Some techniques to get useful information from config.php===
 
1-Using the cat command, dim to see the folder name, file and read the file contents.
Example: dir / home / lphanvan/ public_html / includes
 
cat /homme/lphanvan/public_html/includes/config.php
 
But now the majority of servers are not allowed to exercise this function should apply this method will not work,
 
 
2-Using Symbolic links - Referred to as symlink
 
 
Symbolic links are basic techniques, and almost as important that the majority of the first attaker think before doing work local attack. 
 
  ln -s "/ home / lphanvan/ public_html / @ ender/ includes /config.php% itcollege.ini "
 
It can be understood simply create one file on the host itcollege.ini with identical content lphanvan config.php file on the server with the user's path
 
  "/home/lphanvan/public_html/@ender/includes/config.php"
 
 
 
''You can read more detail here: http://linuxcommand.org/learning_the_shell.php''
 
==Cracking and Changing the admin's password !!!!==
 
In this case the admin's password does not be encoded by hash, so you do not need to crack it. In many cases, the content would not be showed and the password will be in hash.
 
You have gotten the admin account and password as the picture below by using command line.
 
  cat /etc/home/lphanvan/public_html/config.php
 
                                                   
                                                    [[File:Pass.png]]
                                                                          Figure 2: See the content of config.php " cat /etc/home/lphanvan/public_html/config.php "
 
                                                                       
                                                               
 
Now, let's login to database of website
 
                                                    [[File:Dtb.png]]
                                                                                        Figure 3: Login to database via shell
 
=How to avoid Local Attack?=
In my opinions, Local attack is one of dangerous attacking methods I have used so far. Below are my experiences to avoid the Local attack:
 
 
- Should not use the source code when we do not know where it comes from, malicious code might be attached.
 
- Checking the update of source codes as well as server to fix vulnerability frequently.
 
- Change the password to be stronger and hard to brute force.
 
- Set chmod 400 for sensitive files and 101 for folders.
 
- Use VPS instead of using host to avoid local attack.
 
- Data back up and scan the data to realize it's having malicious code or not. 
 
 
These are my experiences to avoid Local Attack. Surely, It might not a perfect way to avoid, but at least it could help us to reduce the risk.
 
=References=
 
'''English Websites'''
 
''http://linuxcommand.org/lts0010.php''
 
''http://linuxcommand.org/learning_the_shell.php''
 
''http://linuxcommand.org/lts0070.php''
 
'''Vietnamese Websites'''
 
''http://kechocgian.blogspot.com.ee/2013/08/huong-dan-tong-hop-chi-tiet-co-ban-nhat.html''
 
''http://namcoder.com/hack-local-attack-va-cach-phong-tranh/''
 
''http://duyk.net/topic/20-Huong-dan-local-attack-voi-mot-so-phuong-phap-co-ban''
 
'''Video'''
 
''https://www.youtube.com/watch?v=RcusKpvKR_w''
 
=See more=
You might want to see more:
 
'''https://www.youtube.com/watch?v=FjgKtBAiLKQ'''
 
'''https://www.youtube.com/watch?v=6hJ-d2NYLBg'''
 
'''https://www.youtube.com/watch?v=HpY6JxIzs1g'''
 
=Conclusion=
 
As what I wrote above are an outline of the Local Attack method which attackers can use their php shell to exploit not even one website it could be all of websites are standing in a same server. In which the attack can execute the command line to your server to find out the password of your database or host. Get Root access is possible if the Linux server are not being updated. Those steps above might not be used successfully in some cases, because it depends on the configuration of administrator and the version of server is setting up.
 
=Contact=
 
If you want to know more about this method, please do not be hesitated to keep in touch with me :D
 
 
Ender Phan- Cyber Security Engineering- C11
 
 
The Estonian Information Technology College
 
 
Email: lphanvan@itcollege.ee
 
 
My site: cybercoffee.xyz
 
 
[['''''!!! This article is served for education purpose only, I will not responsibility for any harm made by other ones !!!''''']]
 
[[Category:Operatsioonisüsteemide administreerimine ja sidumine]]

Latest revision as of 23:43, 29 January 2017

Abstract

This article will be concerned about one of the common hacking methods in recent decades or even nowadays it is still being used by attackers. Its named Local Attack, this name is not the international official name for it. It was called by many Vietnamese Hackers, by somehow I realized it's quite good to describe partly of this attack method, so I'd like to take this name to be " our speaking" at least in this article. "This name is not available in google if you type by English "


I will illustrate the definition of Local Attack as well as the difficulties we will be suffered when we apply it beside its powerful. I will be talking detail step by step belongs with the certain knowledge what we need to know basically to do much straightforwardly and more understand its purpose. The knowledge requirement will be not hard to stop you getting the most powerful of hacking such as Web App, Linux command lines, Networking, etc.

Because of the security of our website and server, I will not show the php shell link in this article. I apologize for this inconvenient.


Keywords : Hacking, Local attack ,Linux , Web App.

'''''!!! This article is served for education purpose only, I will not responsibility for any harm made by other ones !!!'''''

Local Attack Introduction

What is Local Attack?

In generally, once we host the website to server, after that the user will be provided an " user account" and the directory/folder to mange their website. For instance, the first user has a website "A" and one directory/folder : /home/user1 to manage first user Similarly, the second user has a website "B" and one directory/folder /home/user2 to manage.

Local attack is the method which is applied to hack a website in the same server. For example, I want to attack website "A" from user 1, but unfortunately I could not find out the vulnerabilities to exploit and get an lien from it that means I have no way to attack based on this site "A". So, I will look for the websites which are being on the same server with "A", could be website "B" or "C".

Based on site "B" or "C" both of them are getting some vulnerabilities or another words is " hackable ". After getting the authorities on these site "B" or "C", I will upload the php file named " Shell " to the server of "B" or "C" it's also the server of website "A". The hacking process is starting from now..... 

                                          

                                                                    Firgure 1: Php shell was uploaded to host of the website.

Pros and Cons of Local Attack

Pros: 

     *Does not take a lot of time.
     *Easy to interact with the server via shell and exploit it.

Cons: 

     *Leave the " mark ", The administrator would be able to find where the shell comes from.
     *If the websites are using separate server, Local Attack will be gotten some certain difficult.

What we need to know?

Host and Shared-Host

Normally for web site, its data must be stored on one server (server) is always active and connected to the internet. Storage space on the server used to store the data of the website is called the host. For a number of agencies and organizations, the hired one server for data storage is not practical website. Due to their needs is simply stored, further 1 server rental price is not cheap. Therefore, shared hosting is a reasonable choice. With shared hosting, server memory space is divided into many small hosts, and are separate from each rental. So on one server will contain data for multiple websites, and there is also a source of security for developing local attack.

Operating System and Decentralized system

The Operating system of the server must be Linux

Unlike Windows, Linux operating system has a decentralized system is complicated and strict. Linux supports three permissions to do with files :


r: read access (read)

w: right to record (write)

x: right to execute (execute)

-: not allowed


These rights are assigned to three subjects:


u: owner (owner)

g: group ownership (group)

o: the ordinary users (other)


You can read more here: http://linuxcommand.org/lts0070.php

Shell

Simply put, the shell is a program that takes your commands from the keyboard and gives them to the operating system to perform. In the old days, it was the only user interface available on a Unix computer. Nowadays, we have graphical user interfaces (GUIs) in addition to command line interfaces (CLIs) such as the shell.

On most Linux systems a program called bash (which stands for Bourne Again SHell, an enhanced version of the original Bourne shell program, sh, written by Steve Bourne) acts as the shell program. There are several additional shell programs available on a typical Linux system. These include: ksh, tcsh and zsh.

In this tutorial, I will use the shell php named: Shell r57 or c99. You can download it on google

See more here:

-http://linuxcommand.org/lts0010.php

-http://linuxcommand.org/learning_the_shell.php

*I recommend you use those shells or download it in virtual machines .

How to do Local attack step by step ?

1. View the list of user in server

2. Find the config.php file

3. Get the login information to database

4. Crack and change the password of admin

5. Login and upload the shell

View the list of user in server

If we want to local attack a website as I mentioned before, we need to know the users on the server and which sources it is? . After that , we have able to read the config.php file of the user

The command line to get the user: 

cat /etc/passwd

Some cases, If the above command line does not show the user list, we could try this: 

ls -l /home/

If the server ban to cat the passwd, use could use these command lines: 

less /etc/passwd
./cat/etc/passwd

Find the path file config.php

Depending on the sources the path file will set be default like this: Note: Path is the path locates from server to the site

-With linux: 

/home/user/public_html

Or other

-Joomla: 

path/configuration.php

-Word-Press: 

path/wp-config.php


This is the default path of those type of servers it's being used. It might be changed depended on Administrators (This is mainly due to the habits of programmers ).

(To search for the source path, search by keywords: "cwd", we will see similar code: "require_once (CWD. '/includes/init.php');" - This is the path defaults resulting init.php file)) ......

Get the information from config file

This is the most difficult step of the method

The basic command lines using for Local Attack

-ls, dir: List the names of the files inside the folder ls -al, ls -lia: List the names and attributes of files inside the folder 

 ls -lia "/home/lphanvan/public_html/@ender/includes.config.php"

-sand, ./cat, less, more, tail: View contents inside the file: 

 cat "/home/lphanvan/public_html/@ender/includes/config.php"

-ln: Command symbolic link: 

 ln -s "/home/lphanvan/public_html/@ender/includes/config.php%20ender.ini"

-cd: Convert directory


For example, to navigate to the folder 

 cd / home / lphanvan/ public_html / @ender/ includes / itcollege

 cd ~: Go to Facebook's home directory


-chmod: Distribution rights for files or folders: 

 chmod 400 config.php (working in the directory where the file includes config.php)

-mkdir: create directory:


For me, I want to create a folder in the directory includes: 

 mkdir / home / lphanvan/ public_html / @ ender/ includes / itcollege

-touch: Create file: 

 touch /home/lphanvan/public_html/@ender/includes/itcollege.php

-tar, tip: compress and uncompress command: often used in root symlink 

 tar -zcvf enderhacked.tar.gz soleil (Compressed file folder enderhacked.tar.gz ender)

 tar -zxvf enderhacked.tar.gz (unzip files enderhacked.tar.gz)

See more here: http://linuxcommand.org/lts0070.php

Some techniques to get useful information from config.php

1-Using the cat command, dim to see the folder name, file and read the file contents. 

Example: dir / home / lphanvan/ public_html / includes

cat /homme/lphanvan/public_html/includes/config.php

But now the majority of servers are not allowed to exercise this function should apply this method will not work,


2-Using Symbolic links - Referred to as symlink


Symbolic links are basic techniques, and almost as important that the majority of the first attaker think before doing work local attack. 

 ln -s "/ home / lphanvan/ public_html / @ ender/ includes /config.php% itcollege.ini "

It can be understood simply create one file on the host itcollege.ini with identical content lphanvan config.php file on the server with the user's path 

 "/home/lphanvan/public_html/@ender/includes/config.php"


You can read more detail here: http://linuxcommand.org/learning_the_shell.php

Cracking and Changing the admin's password !!!!

In this case the admin's password does not be encoded by hash, so you do not need to crack it. In many cases, the content would not be showed and the password will be in hash.

You have gotten the admin account and password as the picture below by using command line. 

 cat /etc/home/lphanvan/public_html/config.php



                                                   
                                                                          Figure 2: See the content of config.php " cat /etc/home/lphanvan/public_html/config.php "



Now, let's login to database of website 

                                                   
                                                                                       Figure 3: Login to database via shell

How to avoid Local Attack?

In my opinions, Local attack is one of dangerous attacking methods I have used so far. Below are my experiences to avoid the Local attack:


- Should not use the source code when we do not know where it comes from, malicious code might be attached.

- Checking the update of source codes as well as server to fix vulnerability frequently.

- Change the password to be stronger and hard to brute force.

- Set chmod 400 for sensitive files and 101 for folders.

- Use VPS instead of using host to avoid local attack.

- Data back up and scan the data to realize it's having malicious code or not.


These are my experiences to avoid Local Attack. Surely, It might not a perfect way to avoid, but at least it could help us to reduce the risk.

References

English Websites

http://linuxcommand.org/lts0010.php

http://linuxcommand.org/learning_the_shell.php

http://linuxcommand.org/lts0070.php

Vietnamese Websites

http://kechocgian.blogspot.com.ee/2013/08/huong-dan-tong-hop-chi-tiet-co-ban-nhat.html

http://namcoder.com/hack-local-attack-va-cach-phong-tranh/

http://duyk.net/topic/20-Huong-dan-local-attack-voi-mot-so-phuong-phap-co-ban

Video

https://www.youtube.com/watch?v=RcusKpvKR_w

See more

You might want to see more:

https://www.youtube.com/watch?v=FjgKtBAiLKQ

https://www.youtube.com/watch?v=6hJ-d2NYLBg

https://www.youtube.com/watch?v=HpY6JxIzs1g

Conclusion

As what I wrote above are an outline of the Local Attack method which attackers can use their php shell to exploit not even one website it could be all of websites are standing in a same server. In which the attack can execute the command line to your server to find out the password of your database or host. Get Root access is possible if the Linux server are not being updated. Those steps above might not be used successfully in some cases, because it depends on the configuration of administrator and the version of server is setting up.

Contact

If you want to know more about this method, please do not be hesitated to keep in touch with me :D


Ender Phan- Cyber Security Engineering- C11


The Estonian Information Technology College


Email: lphanvan@itcollege.ee


My site: cybercoffee.xyz


'''''!!! This article is served for education purpose only, I will not responsibility for any harm made by other ones !!!'''''

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