nanog mailing list archives

Re: sorry to ruin several of your evenings...


From: "Christopher L. Morrow" <cmorrow () UU NET>
Date: Tue, 30 Jan 2001 16:37:15 -0500 (EST)



Ok, so perhaps my initial post was not prefaced correctly: "instead of
disallowing queries, change the version returned to something bogus on
your spankin' new upgraded 'must be secure cause paul said so' version of
BIND'?"

:) of course I'm not advocating leaving old/vulnerable versions of stuff
running... just denying the enemy intelligence they COULD use against you.

--Chris


On Tue, 30 Jan 2001, Jared Mauch wrote:


      The problem is that there are those that do not have their
sysadmin staff at proper levels or will use some configuration options
to their advantage to save doing work.  These people should use caution
if they go about it this way instead of upgrading.

      You would be surprised how many requests i get for favico.ico on my
web server still...

      - Jared

On Tue, Jan 30, 2001 at 04:31:30PM -0500, Christopher L. Morrow wrote:

I didn't say I didn't upgrade :) I just said why give out info you don't
need to give out.

--Chris

On Tue, 30 Jan 2001, Jared Mauch wrote:


  The key here is that if you're going to spend time faking the
real response of a query that time may be best spent fixing the
real problem.

  People who will now complain about the number of machines they
need to upgrade, etc.. should now evaluate the costs of running an internet
connected network.  If these costs or risks are too high for you perhaps
you need to evaluate your internet connection policies.

  - Jared

On Tue, Jan 30, 2001 at 09:32:24PM +0000, bmanning () vacation karoshi com wrote:

 lets see... (from previous discussions on the usefullness of tweeking
 the version)
        
        wearing my blackhat, i have to decide which system is worthty
        of my talents... which one should I pick?

        version "bad-ass-bind";         
        -or-
        version "9.1.0"

 of course I could be running 4.8.1 and simply recompile so it _reports_
 a bogus version but the profile of a 9.1.0 code base is -very- distinct
 from a 4.8.1 code base... esp on replies to queries.

 Pick your targets carefully.



Why not jus return some 'bogus' version ??? like this option allows:

version "bad-ass-bind";

:)

--Chris

#######################################################
## UUNET Technologies, Inc.                          ##
## Manager                                           ##
## Customer Router Security Engineering Team         ##
## (W)703-289-8479 (C)703-283-3734                   ##
#######################################################

On Tue, 30 Jan 2001, Stephen Stuart wrote:


While it's not exactly a problem, it does give away that you're running
bind9 (I do like the new 'version' option where you can set the
version.bind reply) even if you change the version to appear to be a bind8
server.

"allow-query" lets you control who can see that information:

zone "bind" chaos { 
        allow-query {
                127.0.0.1 ;
                xxx.xxx.xxx.xxx/len ;
        } ;
        type master; 
        file "filename"; 
};

Stephen





-- 
Jared Mauch  | pgp key available via finger from jared () puck nether net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.
END OF LINE  | Manager of IP networks built within my own home


-- 
Jared Mauch  | pgp key available via finger from jared () puck nether net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.
END OF LINE  | Manager of IP networks built within my own home




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