Great Circle Associates Firewalls
(February 1998)
 

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Subject: Re: What app uses port #7?
From: MacGyver <macgyver @ tos . net>
Date: Mon, 09 Feb 1998 22:38:13 -0600
To: Nerijus Krukauskas <nerutis @ mail . lbank . lt>, Firewalls mailing list <firewalls @ GreatCircle . COM>
In-reply-to: <34DEADBD . 63269530 @ mail . lbank . lt>

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At 09:18 AM 2/9/98 +0200, Nerijus Krukauskas wrote:
>    Hello,
>
>  Maybe this is a stupid question, but anyway.. For what purposes or
>what applications use port 7?
>  RFC1700 says:
>---
>echo              7/tcp    Echo
>echo              7/udp    Echo
>---
>  Is this dangerous? If yes, how much?
>

The echo service, as someone mentioned could be used for
development/testing purposes.  I personally know of no "production"
application that uses it.  Echo is susceptible to all sorts of DoS attacks
and in general is an unnecessary component in any production-level server.
As a rule, I disable the echo, chargen, and discard services on any machine
I'm securing.  I tend to take the model: if I don't need it, disable it,
since every service or daemon that I leave running that I don't strictly
need, is a potential security problem.

Habeeb.

- --
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        ^               Habeeb J. Dihu
     -'   `-            Managing Senior Technologist
   " '     ` "          Cirrus Technologies
 "  '       `  "        
"  '      .  `  "                  
"  '    .' ` `  "       'I don't believe in the no-win scenario'
 " `   '    `' "           -- Captain James T. Kirk,  Star Trek II: TWK
   `  ' _  _ '          'There is an old Vulcan proverb, `Only Nixon 
    '                    could go to China.`'
                           -- Captain Spock, Star Trek VI: TUC
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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References:
Indexed By Date Previous: RE: LINUX FIREWALLS
From: Chris Pugrud <ChrisP @ steldyn . com>
Next: Re: URL rewriting
From: MacGyver <macgyver @ tos . net>
Indexed By Thread Previous: What app uses port #7?
From: Nerijus Krukauskas <nerutis @ mail . lbank . lt>
Next: Re: What app uses port #7?
From: "H. Morrow Long" <morrow . long @ yale . edu>

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