Date: Tue, 9 Feb 1999 17:15:23 +1100
From: matthew green <mrg@ETERNA.COM.AU.>
To: [email protected]Subject: NetBSD Security Advisory 1999-002
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NetBSD Security Advisory 1999-002
Topic: Security problem with netstat
Version: NetBSD-current from 19980603 to 19990208.
Severity: Local users are able to read any kernel memory
location.
Abstract
========
In the version of netstat between the two dates above, a security hole
exists which will allow non-root users to examine any kernel memory
location.
Technical Details
=================
The code which was added to allow printing of kernel protocol control
blocks does not have strict checks to make certain the memory being
display is a protocol control block. Also, since the block contains
information like TCP sequence numbers, users should generally not be
allowed to examine these blocks.
Solutions and Workarounds
NetBSD-current users should update to a source tree newer than
19990208, or apply this patch and rebuild netstat:
ftp://ftp.NetBSD.ORG/pub/NetBSD/misc/security/patches/19990208-netstat
If this action cannot be taken easily, netstat can be disabled for
non-root users.
chmod 555 /usr/bin/netstat
Thanks To
=========
Thanks go to Michael Graff <explorer@netbsd.org.> and Charles Hannum
<root@ihack.net.> for the discovery and resolution of this bug.
More Information
================
Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/.
Copyright 1999, The NetBSD Foundation, Inc. All Rights Reserved.
$NetBSD: NetBSD-SA1999-002.txt,v 1.2 1999/02/09 01:27:27 mrg Exp $
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