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Date: Mon, 26 May 2003 13:32:55 -0300
From: Fernando Schapachnik <fernando@mecon.gov.ar>
To: freebsd-security@freebsd.org
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X-OS: FreeBSD 4.7 - http://www.freebsd.org
Subject: sshd doing dns queries on localhost?
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Hi,
	I noted on my 4.7 machines that when a ssh conection is made, the
following PTR query happens (10.11.1.11 is the src address in the example):

13:23:21.120290 PUBLIC_IP.4523 > PUBLIC_IP.53:  52788+ PTR?
11.1.11.10.in-addr.arpa. (41)
13:23:21.120517 PUBLIC_IP.4524 > PUBLIC_IP.53:  52788+ PTR?
11.1.11.10.in-addr.arpa. (41)
13:23:21.120683 PUBLIC_IP.4525 > PUBLIC_IP.53:  52788+ PTR?
11.1.11.10.in-addr.arpa. (41)
13:23:21.120784 PUBLIC_IP.4526 > PUBLIC_IP.53:  52788+ PTR?
11.1.11.10.in-addr.arpa. (41)

	This is very weird because resolv.conf points to another server. Also,
the capture is from lo0.

	Not that I see a security problem here (just the annoyance of this
filling my log_in_vain logs), but I'm curious about the reason; at least didn't
find any clue looking at source.

May 26 13:23:21 X /kernel: Connection attempt to UDP PUBLIC_IP:53 from PUBLIC_IP:4523
May 26 13:23:21 X /kernel: Connection attempt to UDP PUBLIC_IP:53 from PUBLIC_IP:4524
May 26 13:23:21 X /kernel: Connection attempt to UDP PUBLIC_IP:53 from PUBLIC_IP:4525
May 26 13:23:21 X /kernel: Connection attempt to UDP PUBLIC_IP:53 from PUBLIC_IP:4526

	Thanks for any pointer!

	Regards!

Fernando.