-----Original Message-----
From: Pete Herzog [mailto:pete () isecom org]
Sent: Thursday, November 06, 2003 5:41 PM
To: pen-test () securityfocus com
Subject: RE: Pen-testing remote VPN services over IP
Chris,
In the OSSTMM 2.5 we have included the following as well:
-Enumerate the VPN servers using TCP/UDP scans.
-Use scans searching for response to different IP Types Packets.
-Use ike scans to fingerprint the VPN server
implementation and version.
-Protocol Responses
PPTP : IP Type: 47 (GRE) TCP: 1723
IPSec:1. UDP: 500 (IKE)
IP Type: 50 (ESP)
IP Type: 51 (AH)
L2TP:1. UDP : 1701
L2F:1. UDP: 1701
-Outline the VPN security policy using different
authentication / encryption algorithms.
-Verify the existence of mechanism to control the
client machine misconfiguration and unfiltered ports
-Check the ability of the client software to allow
split tunneling (default route to internet and static routes
to the corporate network)
Sincerely,
-pete
Pete Herzog, Managing Director
Institute for Security and Open Methodologies
__________________________________________
ISECOM is the accreditation authority for the
OPST - OSSTMM Professional Security Tester and
OPSA - OSSTMM Professional Security Analyst
-----Original Message-----
From: Chris McNab [mailto:chris.mcnab () trustmatta com]
Sent: Thursday, November 06, 2003 20:22 PM
To: pen-test () securityfocus com
Subject: Pen-testing remote VPN services over IP
Hi,
As part of some research I am undertaking recently, I'd
like to know
if any of you have any decent information relating to the following
areas of _remote_ assessment of VPN services over IP.
The topics I have covered and documented fully so far include:
- IPsec enumeration, scanning for UDP/500 and using Roy Hills' tools
(ike-scan) to identify the gateway
- Various overflows relating to ISAKMP / IKE packets being sent to
UDP/500, as in MITRE CVE
- Offline aggressive mode IKE pre-shared key cracking, by
sniffing VPN
traffic and using IKECrack
- Check Point aggressive mode IKE username enumeration
(using Roy Hills'
fw1-ike-userguess over UDP/500)
- Check Point Telnet authentication service (TCP/259) user
enumeration
- Check Point information leak attacks that reveal network interface
addresses, over both TCP/256 and TCP/264
- Check Point RDP encapsulation filter bypass techniques,
using UDP/259
- Offline Microsoft PPTP (TCP/1723) MS-CHAP
challenge-response cracking
Two areas in which I've identified a need for tools are:
- Check Point brute force password grinding tool for FWZ or IKE, to
compromise SecuRemote username/password combinations
- PPTP brute force tool, to compromise those user/password
combinations also
Does anyone know of such offensive brute force tools, or
techniques I
have missed (against ISAKMP and Check Point)? if so, any
input would
be greatly appreciated.
Regards,
Chris
Chris McNab
Technical Director
Matta
18 Noel Street
London W1F 8GN
http://www.trustmatta.com
------------------------------------------------------------------
---------
Network with over 10,000 of the brightest minds in information
security at the largest, most highly-anticipated industry
event of the
year. Don't miss RSA Conference 2004! Choose from over 200 class
sessions and see demos from more than 250 industry vendors. If your
job touches security, you need to be here. Learn more or
register at
http://www.securityfocus.com/sponsor/RSA_pen-test_031023
and use priority code SF4.
------------------------------------------------------------------
----------
--------------------------------------------------------------
-------------
Network with over 10,000 of the brightest minds in
information security at the largest, most highly-anticipated
industry event of the year. Don't miss RSA Conference 2004!
Choose from over 200 class sessions and see demos from more
than 250 industry vendors. If your job touches security, you
need to be here. Learn more or register at
http://www.securityfocus.com/sponsor/RSA_pen-> test_031023
and
use priority code SF4.
--------------------------------------------------------------
--------------
Intro
