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Re: BIND Nuking
From: daniele () ORLANDI COM (Daniele Orlandi)
Date: Fri, 25 Jul 1997 21:40:44 +0200

Aveek Datta wrote:

when executed as "bind_nuke bogus.org" on a host, that bogus.org's
primary NS is configured to accept updates from, will cause named
to silently die. Nothing in the logs, nothing on the console.
After a number of similar packets has been received by named any
subsequent attempt to run it will only result in a Segmentation Fault.
[and there's "spoofing"...]

I configured bind to accept updates only from a single host.
What will happen if the attack comes from another host ?
Will it reject the update attemp as usual or crash anyway ?

In other words, will my host be vulnerable to external attacks if
configured in such way ?

zone "my.net"
 type master;
 file "my.net.zon";
 allow-update {;; };

If the answer is Yes, this could be very dangerous, every BIND 8.1.x
compiled with ALLOW_UPDATES will be vulnerable, even if you don't have
access to modify zones.



 Daniele Orlandi - Utility Line Italia - http://www.xt.net
 Via Mezzera 29/A - 20030 Seveso (MI) - Italy - FAX: ++39(362)540153

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