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Pen-testing remote VPN services over IP
From: "Chris McNab" <chris.mcnab () trustmatta com>
Date: Thu, 6 Nov 2003 19:21:50 -0000

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


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