full-disclosure - rfc1918 space dns requests

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Message-ID: <200403161712.i2GHCmKW005570@turing-police.cc.vt.edu>
From: Valdis.Kletnieks at vt.edu (Valdis.Kletnieks@...edu)
Subject: rfc1918 space dns requests 

On Tue, 16 Mar 2004 11:43:48 EST, "Geo." <geoincidents@...info.org>  said:

> I'm aware of the issues involved with an ISP passing the requests on to the
> root servers but was looking specifically for security type issues relating
> to a private network passing the requests out to their ISP's dns servers.

There's several basic vulnerabilities here:

1) The same screw-up that allows the DNS requests to escape can almost
certainly be used to tunnel other stuff in/out of the network.  Find ways
to use this to your advantage.

2) We've got applications making DNS requests that get forwarded out to
the ISP's servers, where they will almost certainly result in either an error
reply or a timeout  Find ways to use this to your advantage.

3) Despite the slowness and/or brokenness of (2), the site admins haven't fixed
the misconfiguration.  This means they are some combination of clueless and/or
lazy, and this is a tolerated/accepted state of affairs.  Find ways to use this
to your advantage. ;)

It's not so much a vulnerability in and of itself, as a warning signal that there
are probably lots of OTHER issues with the network.

Remember: Nothing screams "poor workmanship" quite like wrinkles in the duct tape. ;)
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