-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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-S
A2006-025.txt.asc
Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/
and http://www.NetBSD.or
g/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 $
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (NetBSD)
iQCVAwUBRWtHbD5Ru2/4N2IFAQLqmwQAiydDKN/hHiglMPLeQM1zqy6wYave
FRuX
asRbY0ORI1wWuNToFyo0u5iECejz21resTwOhvEOALlE6cvWAqfCf1Ss20s4
NxMO
QzjZeqtk82eny8nQBeRT7wplVNlyb3H7OVFXC3gqsNfJf1QmP6LsZKblxSp9
sTbm
1p/gELMVM6k=
=lqik
-----END PGP SIGNATURE-----
|