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Date: Sun, 15 Oct 2000 20:30:19 -0400 (EDT)
From: ahd@kew.com
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Subject: kern/22012: Secure level 2 in kernel prevents read access to ipnat information
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>Number:         22012
>Category:       kern
>Synopsis:       Secure level 2 in kernel prevents read access to ipnat information
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Oct 15 17:40:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Drew Derbyshire
>Release:        FreeBSD 4.1-RELEASE i386
>Organization:
Kendra Electronic Wonderworks, Stoneham, MA 02180 (http://www.kew.com)
>Environment:

	FreeBSD 4.1 running ipnat on firewall.

>Description:

	Raising secure level of the kernel to 2 prevents even read only access to the
	IPNAT maps.

>How-To-Repeat:

   sonata,134# sysctl -a | grep secure
   kern.securelevel: -1

   sonata,136# ipnat -l
   List of active MAP/Redirect filters:
   map ep0 192.168.200.0/22  -> 0.0.0.0/32  proxy port ftp ftp/tcp
   map ep0 192.168.200.0/22  -> 0.0.0.0/32  proxy port 7070 raudio/tcp
   map ep0 192.168.200.0/22  -> 0.0.0.0/32  portmap tcp/udp 20000:21999

   List of active sessions:

   sonata,137# sysctl -w kern.securelevel=2
   kern.securelevel: -1 -> 2

   sonata,138# ipnat -l
   ioctl(SIOCGNATS): Operation not permitted


>Fix:

	Workaround: Disable raising kernel security level.


>Release-Note:
>Audit-Trail:
>Unformatted:


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