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NetBSD Buffer Overflow in iso(4) Lets Local Users Gain Root Privileges
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SecurityTracker Alert ID: 1017832
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SecurityTracker URL: http://securitytracker.com/id?1017832
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CVE Reference: CVE-2007-1677
(Links to External Site)
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Date: Mar 30 2007
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Impact: Denial of service via local system, Execution of arbitrary code via local system, Root access via local system
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Fix Available: Yes
Vendor Confirmed: Yes
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Advisory: NetBSD Security Advisory
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Version(s): 2.0, 2.1, 3.0, 3.1, 4.0_BETA2
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Description: A vulnerability was reported in NetBSD. A local user can obtain root privileges on the target system.
The system does not properly validate parameter length values in iso(4). A local user can trigger a buffer overflow and execute
arbitrary code with root privileges on the target system or cause a kernel panic.
Several functions are affected, including clnp_route().
Christer
Oberg of BitSec discovered and reported this vulnerability.
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Impact: A local user can obtain root privileges on the target system or cause a kernel panic.
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Solution: The vendor has issued a source code fix.
The NetBSD advisory is available at:
ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2007-004.txt.asc
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Vendor URL: ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2007-004.txt.asc (Links to External Site)
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Cause: Boundary error
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Underlying OS: UNIX (NetBSD)
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Reported By: NetBSD Security-Officer <security-officer@NetBSD.org>
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Message History:
None.
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Source Message Contents
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Date: Thu, 29 Mar 2007 22:09:12 +0100
From: NetBSD Security-Officer <security-officer@NetBSD.org>
Subject: NetBSD Security Advisory 2007-004: Insufficient length checking in
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
NetBSD Security Advisory 2007-004
=================================
Topic: Insufficient length checking in iso(4)
Version: NetBSD-current: source prior to March 29, 2007
NetBSD 4.0_BETA2: affected
NetBSD 3.1: affected
NetBSD 3.0.*: affected
NetBSD 3.0: affected
NetBSD 2.1: affected
NetBSD 2.0.*: affected
NetBSD 2.0: affected
Severity: Local denial of service, Local root compromise
Fixed: NetBSD-current: March 29, 2007
NetBSD-4 branch: March 29, 2007
NetBSD-3-1 branch: March 29, 2007
NetBSD-3-0 branch: March 29, 2007
NetBSD-3 branch: March 29, 2007
NetBSD-2-1 branch: March 29, 2007
NetBSD-2-0 branch: March 29, 2007
NetBSD-2 branch: March 29, 2007
Abstract
========
Due to insufficient length checking in iso(4) it is possible for a local
user to cause an overflow, resulting in a local denial of service or
local root compromise.
This vulnerability has been assigned CVE reference CVE-2007-1677.
Technical Details
=================
A number of functions in the iso(4) code including clnp_route() do not
validate the length of arguments passed. As a result of this a user
could supply a bad 'sockaddr' structure to clnp_route() via connect(2).
This can lead to a root compromise if exploited correctly or a denial
of service (panic).
Solutions and Workarounds
=========================
Kernels with the ISO protocol family support are affected, including the
default GENERIC kernel install. Users of affected NetBSD versions are highly
recommended to upgrade their kernel.
Only kernels compiled with the following option are vulnerable to this issue:
options ISO
As a temporary workaround recompile the kernel with the above option
commented out.
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/netiso/clnp_subr.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
=========
Christer Oberg of BitSec discovered and reported this issue.
Christos Zoulas fixed the code.
Revision History
================
2007-03-29 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-SA2007-004.txt.asc
Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.
Copyright 2007, The NetBSD Foundation, Inc. All Rights Reserved.
Redistribution permitted only in full, unmodified form.
$NetBSD: NetBSD-SA2007-004.txt,v 1.1 2007/03/29 08:21:51 adrianp Exp $
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