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Hướng Dẫn Thực Hành - Command Execution Basic Testing (DVWA): Lesson 2

{ Command Execution Basic Testing }
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 (hoặc chạy trên máy ảo DVWA do instructor cung cấp)
  • 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 demonstrate how other linux/unix commands can be appended to an IP Address for execution.
      3. We will explorer the code that allows for malicious use.
  • Legal Disclaimer : Bài lab chỉ dùng cho mục đích học tập, nghiên cứu về bảo mật. 
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. Disable SELINUX
  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. Start a Terminal Console
    • 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.

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 Ping  
    • Notes:
      • Below we are going to do a simply ping test using the web interface.
      • As an example, ping something on your network.
      • Use the IP Address obtained in Section 3, Step 3 if you have nothing else to ping.
    • Instructions:
      1. 192.168.1.106
      2. Click Submit
  3. cat /etc/password (Attempt 1)  
    • Instructions:
      1. cat /etc/passwd
      2. Click Submit
    • Notes:
      • Notice that either a messaging saying illegal IP address was displayed or nothing was returned.
  4. cat /etc/password (Attempt 2)  
    • Instructions:
      1. 192.168.1.106; cat /etc/passwd
      2. Click Submit
    • Notes:
      • Notice that we are now able to see the contents of the /etc/passwd file.
  5. Looking at the weakness  
    • Instructions:
      1. Bring up a terminal window (See Section 3, Step 1, if you don't know how)
      2. cat /var/www/html/dvwa/vulnerabilities/exec/source/low.php
    • Notes:
      1. Notice the two shell_exec lines.
      2. These are the lines that execute ping depending on which Operating System is being used.
      3. In Unix/Linux command, you can run multiple command separated by a ";".
      4. Notice the code does not check that if $target matches an IP Address
        • \d+.\d+.\d+.\d+, where "\d+" represents a number with the possibility of multiple digits, like 192.168.1.106.
      5. The code allows for an attacker to append commands behind the IP Address.
        1. 192.168.1.106; cat /etc/passwd
  6. Copy the /etc/passwd file to /tmp
    • Instructions:
      1. 192.168.1.106; cat /etc/passwd | tee /tmp/passwd
    • Note:
      • Here we are not only displaying the contents of /etc/passwd on the webpage, but also we are copying the /etc/passwd file to the /tmp directory.

Section 7. Proof of Lab
  1. Proof of Lab
    • Instructions:
      1. Bring up a terminal windows
      2. cd /tmp
      3. ls -l passwd
      4. date
      5. echo "Your Name"
        • Replace the string "Your Name" with your actual name.
        • e.g., echo "An Toàn Thông Tin"
    • Proof of Lab Instructions:
      1. Do a <PrtScn>
      2. Paste into a word document
      3. Email to AnToanThongTin.Edu.VN@Gmail.Com
Nhãn:

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