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🐥Basic Pentesting

Reference(s):

hashtag
Enumeration

Hosts/Ports

PORT     STATE SERVICE     REASON         VERSION
22/tcp   open  ssh         syn-ack ttl 61 OpenSSH 7.2p2 Ubuntu 4ubuntu2.4 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   2048 db:45:cb:be:4a:8b:71:f8:e9:31:42:ae:ff:f8:45:e4 (RSA)
| ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDZXasCfWSXQ9lYiKbTNkPs0T+wFym2lZy229LllhY6iDLrjm7LIkhCcrlgnJQtLxl5NPhlHNVmwhlkcPPiAHwluhMVE5xKihQj3i+Ucx2IwiFvfmCz4AKsWlR6N8IZe55Ltw0lcH9ykuKZddg81X85EVsNbMacJNjjyxAtwQmJt1F5kB1B2ixgjLLOyNWafC5g1h6XbEgB2wiSRJ5UA8rOZaF28YcDVo0MQhsKpQG/5oPmQUsIeJTUA/XkoWCjvXZqHwv8XInQLQu3VXKgv735G+CJaKzplh7FZyXju8ViDSAY8gdhqpJommYxzqu9s1M31cmFg2fT5V1z9s4DP/vd
|   256 09:b9:b9:1c:e0:bf:0e:1c:6f:7f:fe:8e:5f:20:1b:ce (ECDSA)
| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBP0SXJpgwPf/e9AT9ri/dlAnkob4PqzMjl2Q9lZIVIXeEFJ9sfRkC+tgSjk9PwK0DUO3JU27pmtAkDL4Mtv9eZw=
|   256 a5:68:2b:22:5f:98:4a:62:21:3d:a2:e2:c5:a9:f7:c2 (ED25519)
|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAzy8ZacWXbPGeqtuiJCnPP0LYZYZlMj5D1ZY9ldg1wU
80/tcp   open  http        syn-ack ttl 61 Apache httpd 2.4.18 ((Ubuntu))
| http-methods: 
|_  Supported Methods: GET HEAD POST OPTIONS
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Site doesnt have a title (text/html).
139/tcp  open  netbios-ssn syn-ack ttl 61 Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp  open  netbios-ssn syn-ack ttl 61 Samba smbd 4.3.11-Ubuntu (workgroup: WORKGROUP)
8009/tcp open  ajp13       syn-ack ttl 61 Apache Jserv (Protocol v1.3)
| ajp-methods: 
|_  Supported methods: GET HEAD POST OPTIONS
8080/tcp open  http        syn-ack ttl 61 Apache Tomcat 9.0.7
|_http-favicon: Apache Tomcat
| http-methods: 
|_  Supported Methods: GET HEAD POST OPTIONS
|_http-open-proxy: Proxy might be redirecting requests
|_http-title: Apache Tomcat/9.0.7

Uptime guess: 0.007 days (since Fri Feb  3 11:41:53 2023)
Network Distance: 4 hops
TCP Sequence Prediction: Difficulty=264 (Good luck!)
IP ID Sequence Generation: All zeros
Service Info: Host: BASIC2; OS: Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
|_clock-skew: mean: 1h40m00s, deviation: 2h53m13s, median: 0s
| nbstat: NetBIOS name: BASIC2, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
| Names:
|   BASIC2<00>           Flags: <unique><active>
|   BASIC2<03>           Flags: <unique><active>
|   BASIC2<20>           Flags: <unique><active>
|   \x01\x02__MSBROWSE__\x02<01>  Flags: <group><active>
|   WORKGROUP<00>        Flags: <group><active>
|   WORKGROUP<1d>        Flags: <unique><active>
|   WORKGROUP<1e>        Flags: <group><active>
| Statistics:
|   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
|_  00 00 00 00 00 00 00 00 00 00 00 00 00 00
| p2p-conficker: 
|   Checking for Conficker.C or higher...
|   Check 1 (port 44546/tcp): CLEAN (Couldnt connect)
|   Check 2 (port 27338/tcp): CLEAN (Couldnt connect)
|   Check 3 (port 38329/udp): CLEAN (Failed to receive data)
|   Check 4 (port 12209/udp): CLEAN (Failed to receive data)
|_  0/4 checks are positive: Host is CLEAN or ports are blocked
| smb-os-discovery: 
|   OS: Windows 6.1 (Samba 4.3.11-Ubuntu)
|   Computer name: basic2
|   NetBIOS computer name: BASIC2\x00
|   Domain name: \x00
|   FQDN: basic2
|_  System time: 2023-02-03T06:51:12-05:00
| 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: 2023-02-03T11:51:12
|_  start_date: N/A

TRACEROUTE (using port 111/tcp)
HOP RTT       ADDRESS
1   263.67 ms 10.2.0.1
2   ... 3
4   391.88 ms basicpentest.thm

Services

Port 8080 does not return anything when we go to the URL. Port 80 shows a website under maintenance:

There's a directory that's housing some more information. We can use ffuf to enumerate the directories.

dev.txt

j.txt

Weak Credentials are present - we will use this information later.

SMB Enumeration

We can enumerate the SMB using smbclient or CrackMapExec and enum4linux

We have a username:Jan which was found from the text. We can use this to bruteforce the password and get into SSH.

hashtag
Exploitation

SSH Bruteforcing

Now that we have a username, we can use Hydra or Metasploit to bruteforce the SSH login and get foothold into the system:

jan:██████████

Foothold

There's another user called Kay which we also found in the note from the SMB share.

Now that we have access to the machine, we can get our user flag then escalate our privs to root. We can use Linpeas to enumerate for possible vectors:

Download the linpeas.sh from the Repoarrow-up-right then host a python web server on your machine:

We can see from the linpeas output that Kay has given us their SSH id_rsa which we can use to SSH into her machine :)

hashtag
Privilege Escalation

Output the SSH key onto a file then do chmod 400 kay_rsa.

That didn't work, let's instead try to crack the id_rsa password

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