Bugtraq: Firewall-1 Identification : port 257 (ie archive : 18701)

["Sacha Faust" <sacha () severus org>]

It's been known for a while that if you find a host with open TCP port
256,257 and 258, you can be pretty sure it's a Firewall-1 box ( please refer
to : http://online.securityfocus.com/archive/1/18701 ).

I did some additional poking at the system and found out that if you connect
to port 257 and you hit a few keys, the server will return fwa1 string.
Here is the sequences that works for me:
1. hit enter
2. hit a few keys (2-3 is enough)
3. hit enter

the server will return the fwa1 string.

Example (my input was enter+test+enter):
[sacha () hole sacha]$ nc 1.1.1.1 257
        30000005
test
fwa1

[sacha () hole sacha]$

If you hit other sequences, you data but no fwa1 string. I didn't seen this
feature mentioned. If this is already known, please ignore this post. This
was discovered on a client system so I don't have all the details of the
firewall config for now. All I know is it's a FW1 box. On what I have no
idea.

---------
Sacha Faust
sacha () severus org