Re: All tcp ports open?
From: Bill Burge (bill_at_burge.com)
Date: 08/31/04
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Date: Mon, 30 Aug 2004 16:45:53 -0700 To: pen-test@securityfocus.com
An SSL connection doesn't respond with a banner. (to a port scan)
Quite a few of them darn things around, I rekon...
bb
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On 8/30/2004 at 12:28 AM Erik Birkholz wrote:
>Just a clarification for the list based on Andres' post.
>
>"I think it should be safe
>to say that any *real* program will respond with a banner"
>
>This is not a safe assumption, many services do not respond with a banner.
>Some common examples are Terminal Server and MS SQL Server.
>
>Btw, I have seen this behavior when scanning through a sidewinder
>firewall. The sidewinder has the capability to send a tcp syn/ack packet
>response after droping the inbound packet. Kinda neat, like a deny
>response but so much better. :)
>
>
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>Foundstone, Inc.
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>-----Original Message-----
>From: Andres Riancho <andresit@fibertel.com.ar>
>To: Massimo Cetra <mcetra@navynet.it>; 'Ben Timby' <asp@webexc.com>;
>pen-test@securityfocus.com <pen-test@securityfocus.com>
>Sent: Mon Aug 30 00:50:21 2004
>Subject: Re: All tcp ports open?
>
>Ben ,
> What about "nmap -sV" ? this will still give you a complete list of
>open ports , but also will retrieve the banners. I think it should be safe
>to say that any *real* program will respond with a banner , so ,only the
>ports with banners will be the ones you should pen-test.
>
>Andres Riancho
> SOC Impsat
>
>
>----- Original Message -----
>From: "Massimo Cetra" <mcetra@navynet.it>
>To: "'Ben Timby'" <asp@webexc.com>; <pen-test@securityfocus.com>
>Sent: Sunday, August 29, 2004 11:10 AM
>Subject: RE: All tcp ports open?
>
>
>> > I am not sure what is doing this, but I assume it is a
>> > software (or some
>> > kind of) firewall/hids, can anybody point me in the right direction?
>> >
>> > I am pen-testing a Windows webserver, and a port scan reveals ALL tcp
>> > ports open. hping also confirms that a SA is returned for any
>> > S packets
>> > sent to any port I try. I can connect via netcat any of the
>> > ports, and
>> > send data, but nothing is returned. In order to verify services, I am
>> > required to connect and check for a banner or send
>> > appropriate protocol
>> > commands to elicit a response.
>> >
>> > Has anyone seen this, or have any idea of what this is?
>>
>> http://www.iptables.org/patch-o-matic/pom-extra.html#pom-extra-TARPIT
>>
>> This is for Linux but may help you finding more informations.
>>
>> Max
>>
>>
>>
>>
>>
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>>
>>
>
>
>------------------------------------------------------------------------------
>Ethical Hacking at the InfoSec Institute. All of our class sizes are
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>Ethical Hacking at the InfoSec Institute. All of our class sizes are
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>learn to write exploits and attack security infrastructure. Attend a course
>taught by an expert instructor with years of in-the-field pen testing
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>Ethical Hacker to better assess the security of your organization.
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>http://www.infosecinstitute.com/courses/ethical_hacking_training.html
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Ethical Hacking at the InfoSec Institute. All of our class sizes are
guaranteed to be 12 students or less to facilitate one-on-one interaction
with one of our expert instructors. Check out our Advanced Hacking course,
learn to write exploits and attack security infrastructure. Attend a course
taught by an expert instructor with years of in-the-field pen testing
experience in our state of the art hacking lab. Master the skills of an
Ethical Hacker to better assess the security of your organization.
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