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Date: Fri, 24 Apr 1998 11:33:06 -0700 (PDT)
From: Archie Cobbs <archie@whistle.com>
Reply-To: archie@whistle.com
To: FreeBSD-gnats-submit@FreeBSD.ORG
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Subject: conf/6406: Tweak to rc.firewall
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>Number:         6406
>Category:       conf
>Synopsis:       Tweak to rc.firewall
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Apr 24 11:40:04 PDT 1998
>Last-Modified:
>Originator:     Archie Cobbs
>Organization:
Whistle Communications, Inc.
>Release:        FreeBSD 2.2.6-RELEASE i386
>Environment:

	FreeBSD 2.2.6

>Description:

	/etc/rc.firewall rule needs strengthening

	The ipfw rule

	  add 1010 deny all from 127.0.0.0/8 to 127.0.0.0/8

	should really be

	  add 1010 deny all from any to 127.0.0.0/8

	because someone who set their route to 127.0.0.0/8 via
	your machine could still connect to your internally bound
	services as long as their source address was not on the
	127/8 network (isn't this the point of this rule?)

	Also, I renumbered the rules to make sure they are first.

>How-To-Repeat:

	Set up 2 FreeBSD machines. On machine A install these
	rules. On machine B, disable your lo0 interface and set
	a route to 127.0.0.0/8 via machine A. Now from machine
	B you can connect to any internal service on machine A
	bound to the 127.0.0.1 address.

>Fix:

Index: rc.firewall
===================================================================
RCS file: /cvs/freebsd/src/etc/rc.firewall,v
retrieving revision 1.6.2.6
diff -c -r1.6.2.6 rc.firewall
*** rc.firewall	1998/02/10 01:45:57	1.6.2.6
--- rc.firewall	1998/04/24 18:29:53
***************
*** 67,74 ****
  
  ############
  # Only in rare cases do you want to change these rules
! $fwcmd add 1000 pass all from any to any via lo0
! $fwcmd add 1010 deny all from 127.0.0.0/8 to 127.0.0.0/8
  
  
  # Prototype setups.
--- 67,74 ----
  
  ############
  # Only in rare cases do you want to change these rules
! $fwcmd add 100 pass all from any to any via lo0
! $fwcmd add 200 deny all from any to 127.0.0.0/8
  
  
  # Prototype setups.
>Audit-Trail:
>Unformatted:

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