Penetration Testing mailing list archives
Re: Bypassing Firewalls
From: William Hancock <bill.hancock () isthmusgroup com>
Date: Fri, 07 Apr 2006 09:06:41 -0500
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Sparky: I don't want to come off sounding to snotty but I need help considering the facts you're offering us.. 1. You say you are pen testing a customer that has 65,000 IPs. 2. Those addresses aren't translated, so a.a.a.a (outside) == a.a.a.a (inside) 3. You're trying to use nmap as some sort of tunneling tool? 4. You are aware, or at least under the impression, that the only ingress traffic is HTTP and BIND. 5. You want to use nessus to scan through a firewall to assess open services and vulnerabilities 6. You've attempted to use the standard old FTP bounce through a perimeter that only allows 80 and 53. None of this is really computing that well, 1,2,4, and 6 just don't make any sense and I'm not even going to begin to explain why. Nmap won't help you establish any sort of connection to the inside of the firewall, and nessus will only scan what it can access. If you have a client large enough to support that many public IPs and you're posing questions about quietly slipping ((~ 65535 x 65000) x # of vulnerabilities nessus will scan for) past a firewall with 2 allowed ports/protocols open on it you're a bit out of your league. I would advise you to seek a qualified security consultant to perform the testing and watch everything he does. There seems to be some gaps in your networking knowledge as well and there are lots of great books out there that could help you, I'm sure someone on list can recommend a few. The short answer however, based upon the information you provided, you need to root a box on the inside, or simply ask permission to use one, and stage your attack from there. Sorry, I'm not yet caffeinated and I need some coffee. Regards, Bill Hancock www.exactconsulting.com 09Sparky () gmail com wrote:
I am a new Pentester and have some general questions as to how to bypass Firewalls. I have attempted the standard FTP bounce and fragmentation
attempts in nmap, but have been unsuccessful. My main question I guess would be: How do you get past a firewall, so you could for instance perform your nessus scanning, etc? I have a good understanding of all the steps involved, I just am having problems actually getting them to work. Do I need to find exploits in the Firewall, or are there other more effective ways?
For instance, I want to do a standard Pen test on a company (class B
network, no NAT). I have their IP range, but they have a firewall blocking everything but HTTP and DNS. How do I get past the firewall to perform the test on there IP range?
Any help/suggestions would be great, Thanks, Sparky ------------------------------------------------------------------------------ This List Sponsored by: Cenzic Concerned about Web Application Security? Why not go with the #1 solution - Cenzic, the only one to win the
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-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.1 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFENnHxoShIrIREThQRAuDTAJ9d2uVzZsEM+qOjMdfsNvsoVay3HgCcDDl2 lniAYFuRsgI/TmjqJSreqbU= =QGNG -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ This List Sponsored by: Cenzic Concerned about Web Application Security? Why not go with the #1 solution - Cenzic, the only one to win the Analyst's Choice Award from eWeek. As attacks through web applications continue to rise, you need to proactively protect your applications from hackers. Cenzic has the most comprehensive solutions to meet your application security penetration testing and vulnerability management needs. You have an option to go with a managed service (Cenzic ClickToSecure) or an enterprise software (Cenzic Hailstorm). Download FREE whitepaper on how a managed service can help you: http://www.cenzic.com/news_events/wpappsec.php And, now for a limited time we can do a FREE audit for you to confirm your results from other product. Contact us at request () cenzic com for details. ------------------------------------------------------------------------------
Current thread:
- Bypassing Firewalls 09Sparky (Apr 07)
- Re: Bypassing Firewalls William Hancock (Apr 07)
- <Possible follow-ups>
- Re: Bypassing Firewalls 09sparky (Apr 07)
- Re: Bypassing Firewalls Alex Nordström (Apr 09)
- RE: Bypassing Firewalls Clement Dupuis (Apr 09)
- Re: Bypassing Firewalls sol (Apr 09)
- Re: Bypassing Firewalls Joachim Schipper (Apr 10)
- RE: Bypassing Firewalls Lars Troen (Apr 09)