AUSCERT External Security Bulletin Redistribution
              ESB-1999.029 -- NetBSD Security Advisory 1999-005
                   Security problem in lsof package fixed.
                                01 March 1999


The NetBSD Foundation, Inc. has released the following advisory concerning 
a buffer overflow vulnerability in the lsof package.  This vulnerability 
may allow local users to gain root access.

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                 NetBSD Security Advisory 1999-005

Topic:		Security problem in lsof package fixed.
Version:	Anything before lsof-4.40 without arg.c.patch applied.
Severity:	Local users may obtain root priviledge.


Buffer overflow in lsof version 4.40 and prior where local users may
obtain root priviledge.  This package is available with the NetBSD
packages collection and is not installed by default.

Technical Details

In http://www.hert.org/advisories/HERT-02.asc was reported:

When lsof is setuid-root or setgid kmem it is vulnerable to a buffer
overflow that will lead to direct root compromise or root compromise
through live kernel patching.

Solutions and Workarounds

As immediate workaround remove the setgid bit from lsof:

	chmod 0755 /usr/pkg/sbin/lsof

For a real solution NetBSD users should update pkgsrc/sysutils/lsof so
it contains:

     NetBSD: Makefile,v 1.13 1999/02/18 23:09:45 frueauf Exp

and rebuild/install the lsof package. This applies arg.c.patch
which was made available from the author of lsof:

MD5 (lsof/arg.c.patch) = 83fc82fe3c9917418934b964854b4590

This patch corrects a buffer overflow in the processing of -u option
login name values. Without this patch a login name longer than 9
characters can cause an internal buffer overflow and segmentation fault.

Thanks To

Thanks go to Vic Abell <abe@purdue.edu> for providing arg.c.patch
on the lsof main site, HERT (http://www.hert.org/advisories/HERT-02.asc)
for announcing the advisory and Thorsten Frueauf <frueauf@netbsd.org>
for fixing lsof in the NetBSD packages collection.

Revision History
	1998/02/28 - fix the NetBSD RCS ID expansion in the Solutions
	and Workarounds section.

More Information

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

Copyright 1999, The NetBSD Foundation, Inc.  All Rights Reserved.

$NetBSD: NetBSD-SA1999-005.txt,v 1.3 1999/02/28 01:24:08 mrg Exp $

Version: 2.6.3ia
Charset: noconv

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