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What You Need

• A Kali virtual machine. I used version 2017.1.

Purpose

Apache Struts is a popular server-side Java-basedframework used to make web applications. Firstwe'll set up a vulnerable server, and then exploitit with Metasploit.

Note that this is NOT the very latest exploit,released Sept 5, 2017. For that exploit,seethis project.

This exploit was released in Marchof 2017.

Download the Ubuntu 16.04.02 Server ISO

In a Web browser, go tohttps://www.ubuntu.com/download/server

Download the latest version of Ubuntu 16.04 server. WhenI looked, the latest version was 16.04.03, 64-bit only.

Create a VM

Start VMware. Create a new virtual machine,using the ISO file. The steps depend on yourVMware version.

For VMware Fusion on a Mac, the steps are:

• File, New...
• Accept the default option of 'Install from disc orimage' and click Continue.
• Navigate to the Ubuntu ISO, click it, and click Continue.
• In the 'Linux Easy Install' box, enter student in all the fields. Click Continue.
• Click Finish.
• Select a folder and name for your VM.

When the Ubuntu server starts, log in with these credentials:

Username: studentPassword: student

Installing SSH

To control the VM, you need SSH, so you can copy andpaste commands into the Terminal.

On your Ubuntu console, execute this command:

Enter the password student when you are prompted to.

On your Ubuntu console, execute these commands:

Connecting via SSH

On your host system, connect to your server via SSH.

On a Mac, in a Terminal window, execute this command,replacing the IP address with the IP address ofyour Ubuntu server.

Add the server fingerprint when you are promptedto.

Enter the password student when you areprompted to.

If you are using Windows, installPuTTYand use it to connect to your Ubuntu server.Install Oracle Java JDK 8On your host system,in a Web browser, go here:http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Accept the agreement.

Download jdk-8u144-linux-x64.tar.gz

On a Mac host, open a new Terminal windowand execute these commands to move theJava installer file to the server,replacing the IP address with the IP address ofyour Ubuntu server.

Enter the password student when you areprompted to.

If you are using Windows, you can move files to yourserver with SSHSecureShellClient, which you can get here:

In the SSH session controlling your Ubuntu server,execute these commands:

Enter the password student if youare prompted to.

In the SSH session controlling your Ubuntu server,execute these commands:

If you see 'nothing to configure' that's OK.

In the SSH session controlling your Ubuntu server,execute this command:

You should seea version number,as shown below.

Installing Tomcat

For future reference, I got Tomcatfrom this page:http://tomcat.apache.org/download-90.cgi

In the SSH session controlling your Ubuntu server,execute these commands:

In the SSH session controlling your Ubuntu server,execute these commands:Add this line to the bottom of the file,as shown below.Save the file with Ctrl+X, Y,Enter.

In the SSH session controlling your Ubuntu server,execute this command to set the new environment variable:

In the SSH session controlling your Ubuntu server,execute this command to start Tomcat:Tomcat starts,as shown below.

On your host system,in a Web browser, openthis URL,replacing the IP address with the IP address ofyour Ubuntu server.

http://172.16.1.178:8080/

You see an Apache Tomcat page,as shown below.

Install unzip

In the SSH session controlling your Ubuntu server,execute these commands:

Install Struts2 (Old, Vulnerable Version)

In the SSH session controlling your Ubuntu server,execute these commands:

Install Maven

In the SSH session controlling your Ubuntu server,execute these commands:Add this line to the bottom of the file,as shown below.

Save the file with Ctrl+X, Y,Enter.

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In the SSH session controlling your Ubuntu server,execute this command to set the new environment variable:

In the SSH session controlling your Ubuntu server,execute this command:You see a version number,as shown below.

Creating a Project

In the SSH session controlling your Ubuntu server,execute these commands:Many pages of 'Downloading' messagesscroll by.

When you see the message:'Define value for property 'version' 1.0-SNAPSHOT: :',press Enter.

When you see the message:'Y: :',press Enter.

You see a 'BUILD SUCCESS' message,as shown below.

In the SSH session controlling your Ubuntu server,execute these commands:

The file opens, as shown below.This is an XML configuration file.

At the bottom of the file,in the 'build' section,change myWebApp tobasic_struts,so it is as shown below:

At the bottom of the file,in the 'dependencies' section,add a new 'dependency' section,as shown below:Include in the “dependencies” Section:

Save the file with Ctrl+X, Y,Enter.

To make your web app,in the SSH session controlling your Ubuntu server,execute this command:

Many pages of 'Downloading' messages scroll by, ending witha green 'BUILD SUCCESS' message,as shown below.

This has created a 'war' file, ready to deploy,at this location:

~/myWebApp/target/basic_struts.war

However, we don't actually need that application.We'll deploy a different one later.

Comfiguring Web-Based Deployment

In the SSH session controlling your Ubuntu server,execute these commands:Add this line to the bottom of the file,as shown below.

Save the file with Ctrl+X, Y,Enter.

In the SSH session controlling your Ubuntu server,execute this command to set the new environment variable:

Now we need to adjust the tomcat configurationto allow administration from remote addresses.

In the SSH session controlling your Ubuntu server,execute this command:

The 'tomcat-users' section contain onlycomments, as shown below.

Insert these lines into the 'tomcat-users' section,as shown below.

Save the file with Ctrl+X, Y,Enter.

In the SSH session controlling your Ubuntu server,execute this command:

Insert these lines into the file,as shown below.

Save the file with Ctrl+X, Y,Enter.

In the SSH session controlling your Ubuntu server,execute these commands to restart Tomcat.It may take a few minutes to shut down the firsttime--that's OK.

Tomcat restarts,as shown below.

Opening the Web-Based Administration Page

On your host system,in a Web browser, openthis URL,replacing the IP address with the IP address ofyour Ubuntu server.

http://172.16.1.198:8080/manager

A box pops up asking for credentials.Enter these credentials:

Username: admin
Password: admin

In the 'Tomcat Web Application Manager'page, scroll down to the'Deploy' section,as shown below.

If you can't open the manager page,check the log with this command:When I did it, I had an error in the manager.xml file.

Downloading a Vulnerable Web App

On your host system,in a Web browser,go to:

On the right side,click the Download button.

You get a file named struts2_2.3.15.1-showcase.war

Deploying the Vulnerable Web App

In the 'Tomcat Web Application Manager'page, in the'Deploy' section,in the 'WAR file to deploy' section,click the 'Choose File' button.

Navigate to your Downloads folder anddouble-click thestruts2_2.3.15.1-showcase.warfile.

Click the Deploy button.

The Tomcat page now shows the/struts2_2.3.15.1-showcase applicationat the bottom of the Applicationssection,as shown below.

Click /struts2_2.3.15.1-showcase.

The 'Struts2 Showcase' page appears,as shown below.

Saving the Screen Image

Make sure the 'Struts2 Showcase' message is visibleat the top left of thepage, as shown above.

Save a whole-desktop screen capturewith a filename of 'Proj 9xa from YOUR NAME'.

Attacking from Metasploit

Launch Kali.

In a Terminal window,execute these commands to updateMetasploit:

In Kali,execute this command to launchMetasploit:In Metasploit, execute this commandto find 'struts' exploits:Several exploits are found,as shown below. We'll use the first one,from March of 2017.

In Metasploit, execute these commandsto select the exploit, show options,set the target and vulnerable URI, and exploit it.

Replace the IP address with the IP address ofyour Ubuntu server.

The exploit fails,as shown below.

What's the problem? When all else fails,consult the documentation.

Open this page:

Ths documentation says to try a 'cmd/*' payload,as shown below.

In Metasploit, execute these commandsto select show available payloads:

Scroll back up several pages to seethe 'cmd' payloads,as shown below.

In Metasploit, execute these commandsto set the current payload to 'cmd/unix/generic',and show its options:

We need to choose a Linuxcommand and put it in the 'CMD'parameter,as shown below.

In Metasploit, execute these commandsto set CMD to 'touch /tmp/foo'and exploit the target:

The exploit completes, as shown below.

In the SSH session controlling your Ubuntu server,execute this command:

The file 'foo' was created,as shown below. We have some control of thetarget!

In Metasploit, execute these commandsto use the 'cmd/unix/bind_netcat'payloadand exploit the target:

The exploit completes, as shown below,and opens a shell. There is no prompt,but you can execute commands like 'whoami'and 'ls'.

Saving the Screen Image

Make sure the'

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set PAYLOAD cmd/unix/bind_netcat'and'Command shell session opened'messages are visible,as shown above.

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Save a whole-desktop screen capturewith a filename of 'Proj 9xb from YOUR NAME'.

Turning In Your Project

Email the image to cnit.124@gmail.com with a subject of'Project 9x from YOUR NAME'.

Sources

Struts 2 Getting-Started on Ubuntu 14.04 Trusty LTS Linux Easy Guide
Apache Struts Jakarta Multipart Parser OGNL Injection
How can I install Sun/Oracle's proprietary Java JDK 6/7/8 or JRE?
Maven 3 How-to Generate a Java Web App Project on Ubuntu Linux Easy Guide
Struts 2 Blank Archetype
How does one set up/install struts on Ubuntu or a Nix machine?
Maven can't find Struts2 dependencies
Apache Tomcat 8 Apps Manager Quick-Start on Linux/Unix
CVE-2017-5638 - Apache Struts2 S2-045

Jdk-8u144-macosx-x64.dmg

Add Apache Struts 2 REST Plugin XStream RCE #8924
Posted 9-7-17 by Sam Bowne

Java Jdk-8u144 Mac Download Windows 10

Updated 9-8-17