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		 NetBSD Security Advisory 2003-003
		 =================================

Topic:		Buffer Overflow in file(1)

Version:	NetBSD-current:	source prior to February 27, 2003
		NetBSD 1.6:	affected
		NetBSD-1.5.3:	affected
		NetBSD-1.5.2:	affected
		NetBSD-1.5.1:	affected
		NetBSD-1.5:	affected

Severity:	Inducing a user to run file(1) could execute code as the user

Fixed:		NetBSD-current:		February 26, 2003
		NetBSD-1.6 branch:	March 8, 2003 (1.6.1 includes the fix)
		NetBSD-1.5 branch:	March 9, 2003 (1.5.4 includes the fix)


Abstract
========

If file(1) is run over a specially constructed ELF file, an exploitable
stack overflow occurs and attackers can gain the privileges of the user
running file(1).


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

A buffer overflow has been found in the file(1) program. If a user
were to run file(1) over a specially doctored ELF file, arbitrary code
would be executed as a result. Thus, if an attacker can somehow induce
a user to run file(1) over a file the attacker controls, the attacker
may gain any system privileges the victim possesses.

See iDEFENSE Security Advisory 03.04.03 
http://www.idefense.com/advisory/03.04.03.txt


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

The following instructions describe how to upgrade your file(1)
binaries by updating your source tree and rebuilding and
installing a new version of file(1).

* NetBSD-current:

	Systems running NetBSD-current dated from before 2003-02-27
	should be upgraded to NetBSD-current dated 2003-02-27 or later.

	The following files need to be updated from the netbsd-current
	CVS branch (aka HEAD) to the respective revisions:
		src/usr.bin/file/readelf.c:	1.17
		src/usr.bin/file/softmagic.c:	1.31

	To update from CVS, re-build, and re-install file:
		# cd src
		# cvs update -d -A -P usr.bin/file
		# cd usr.bin/file

		# make cleandir dependall
		# make install


* NetBSD 1.6:

	The binary distribution of NetBSD 1.6 is vulnerable.

	Systems running NetBSD 1.6 sources dated from before
	2003-03-09 should be upgraded from NetBSD 1.6 sources dated
	2003-03-09 or later.

	NetBSD 1.6.1 will include the fix.

	The following files need to be updated from the netbsd-1-6
	CVS branch to the respective revisions:
		src/usr.bin/file/readelf.c:	1.13.2.1
		src/usr.bin/file/softmagic.c:	1.26.2.1

	To update from CVS, re-build, and re-install file:
		# cd src
		# cvs update -d -r netbsd-1-6 -P usr.bin/file
		# cd usr.bin/file

		# make cleandir dependall
		# make install


* NetBSD 1.5, 1.5.1, 1.5.2, 1.5.3:

	The binary distribution of NetBSD 1.5.3 is vulnerable.

	Systems running NetBSD 1.5, 1.5.1, 1.5.2, or 1.5.3 sources dated
	from before 2003-03-10 should be upgraded from NetBSD 1.5.*
	sources dated 2003-03-10 or later.

	The following files need to be updated from the netbsd-1-5
	CVS branch to the respective revisions:
		src/usr.bin/file/readelf.c:	1.6.4.3
		src/usr.bin/file/softmagic.c:	1.18.4.2

	To update from CVS, re-build, and re-install file:
		# cd src
		# cvs update -d -r netbsd-1-5 -P usr.bin/file
		# cd usr.bin/file

		# make cleandir dependall
		# make install


Thanks To
=========

Lubomir Sedlacik and Antti Kantee, for drawing our attention to the
problem.

Christos Zoulas, for aiding in the solution and with this advisory.


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

	2003-03-12	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-SA2003-003.txt.asc

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


Copyright 2003, The NetBSD Foundation, Inc.  All Rights Reserved.
Redistribution permitted only in full, unmodified form.

$NetBSD: NetBSD-SA2003-003.txt,v 1.7 2003/03/12 03:51:31 david Exp $