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             AUSCERT External Security Bulletin Redistribution

                         ESB-2006.0869 -- [NetBSD]
                Multiple information/memory leakage issues
                             28 November 2006

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              kernel
Publisher:            NetBSD
Operating System:     NetBSD
Impact:               Access Privileged Data
Access:               Existing Account

Original Bulletin:    
  ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2006-025.txt.asc

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		 NetBSD Security Advisory 2006-025
		 =================================

Topic:		Multiple information/memory leakage issues

Version:	NetBSD-current:	source prior to October 27, 2006
		NetBSD 3.1:		not affected
		NetBSD 3.0.2:		not affected
		NetBSD 3.0.1:		affected
		NetBSD 3.0:		affected
		NetBSD 2.1:		affected
		NetBSD 2.0.*:		affected
		NetBSD 2.0:		affected

Severity:	Information/memory leakage.

Fixed:		NetBSD-current:		October 27, 2006
		NetBSD-3-0 branch:	October 27, 2006
		NetBSD-3 branch:	October 27, 2006
		NetBSD-2-1 branch:	November 19, 2006
		NetBSD-2-0 branch:	November 19, 2006
		NetBSD-2 branch:	November 19, 2006


Abstract
========

There are multiple information/memory leakage issues present in the 
NetBSD kernel.


Technical Details
=================

* ptrace memory/information leak
A userspace parameter passed to the ptrace(2) call involving a PT_LWPINFO 
request can result in a memory/information leak.

* if_clone_list() information leak
There is a minor kernel memory disclose in if_clone_list() where up to 
IFNAMSIZ bytes of uninitialized stack memory are copied out to userland.


Solutions and Workarounds
=========================

For all NetBSD versions, you need to obtain fixed kernel sources,
rebuild and install the new kernel, and reboot the system.
                                      
The fixed source may be obtained from the NetBSD CVS repository.

The following instructions briefly summarise how to upgrade your
kernel.  In these instructions, replace:

  ARCH     with your architecture (from uname -m), and
  KERNCONF with the name of your kernel configuration file.

To update from CVS, re-build, and re-install the kernel:

	# cd src
	# cvs update sys/kern/sys_process.c \
	 	sys/net/if.c
	# ./build.sh kernel=KERNCONF
	# mv /netbsd /netbsd.old
	# cp sys/arch/ARCH/compile/obj/KERNCONF/netbsd /netbsd
	# shutdown -r now

For more information on how to do this, see:

   http://www.NetBSD.org/guide/en/chap-kernel.html


Thanks To
=========

The ptrace memory/information leak was discovered and reported by
 Ben Hawkes of Suresec Pty. Ltd.
The if_clone_list() information leak was discovered and reported by
 Christer Oberg of BitSec.


Revision History
================

	2006-11-27	Initial release


More Information
================

Advisories may be updated as new information becomes available.
The most recent version of this advisory (PGP signed) can be found at 
  ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2006-025.txt.asc

Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.


Copyright 2006, The NetBSD Foundation, Inc.  All Rights Reserved.
Redistribution permitted only in full, unmodified form.

$NetBSD: NetBSD-SA2006-025.txt,v 1.3 2006/11/27 20:14:45 adrianp Exp $

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