RE: Pen-testing remote VPN services over IP
From: Pete Herzog (pete_at_isecom.org)
Date: 11/06/03
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To: <pen-test@securityfocus.com> Date: Thu, 6 Nov 2003 23:40:35 +0100
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
>
>
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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
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and use priority code SF4.
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- Previous message: Robert Bruce: "/_vti_pvt/users.pwd question"
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