[bglug] Fwd: SuSE Security Announcement: sysconfig (SuSE-SA:2002:016)
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Wed, 8 May 2002 23:08:45 +0200
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---------- Messaggio inoltrato ----------
Subject: SuSE Security Announcement: sysconfig (SuSE-SA:2002:016)
Date: Wed, 8 May 2002 12:35:35 +0200 (CEST)
From: Sebastian Krahmer <krahmer@suse.de>
To: <bugtraq@securityfocus.com>
-----BEGIN PGP SIGNED MESSAGE-----
_________________________________________________________________________=
____
_
SuSE Security Announcement
Package: sysconfig
Announcement-ID: SuSE-SA:2002:016
Date: Wed May 8 12:00:00 MEST 2002
Affected products: 8.0
Vulnerability Type: remote command execution
Severity (1-10): 4
SuSE default package: Yes.
Other affected systems: No.
Content of this advisory:
1) security vulnerability resolved: Quotation problem in ifup-dhc=
p.
problem description, discussion, solution and upgrade informat=
ion
2) pending vulnerabilities, solutions, workarounds
3) standard appendix (further information)
_________________________________________________________________________=
____
_
1) problem description, brief discussion, solution, upgrade information
The ifup-dhcp script which is part of the sysconfig package is
responsible for setting up network-devices using configuration data obta=
ined
from a DHCP server by the dhcpcd DHCP client. It is possible for remote
attackers to feed this script with evil data via spoofed DHCP replies fo=
r
example. This way ifup-dhcp could be tricked into executing arbitrary
commands as root. The ifup-dhcp shellscript has been fixed to not source=
the
file containing the possible evil data anymore.
Even though the sysconfig package is installed by default, this
problem only affects systems with certain dhcp network-setups so only us=
ers
using DHCP should update their sysconfig package.
Please download the update package for your distribution and verify i=
ts
integrity by the methods listed in section 3) of this announcement.
Then, install the package using the command "rpm -Fhv file.rpm" to ap=
ply
the update.
Our maintenance customers are being notified individually. The packag=
es
are being offered to install from the maintenance web.
i386 Intel Platform:
SuSE-8.0
=20
ftp://ftp.suse.com/pub/suse/i386/update/8.0/a1/sysconfig-0.23.14-60.i386=
=2Erpm
4d6a9f1a3e1a461ebbea9a6e98f4e894
source rpm:
=20
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sysconfig-0.23.14-60.src=
=2Erpm
d0fdfe02cfc9b7fc32fed8da6c16cf9d
_________________________________________________________________________=
____
_
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- mozilla/netscape
The mozilla browser in version 0.9.7 or higher and the netscape brows=
er
in version 6.1 or higher contain a flaw which allows remote sites
to read arbitrary files if the user running the browser has the
permission to do so. Fixed packages for the mozilla browser will be
available soon on our ftp-servers. Patches for the affected netscape
browser are not yet available due to missing fixes from Netscape.
- xpilot
It has been reported that the xpilot server contains a buffer-overflo=
w
which allows remote attackers to execute arbitrary commands as the us=
er
running the server. The overflow has been fixed and new xpilot packag=
es
are available on our ftp-servers. Please update to the newest xpilot
packages if you used to run this program.
_________________________________________________________________________=
____
_
3) standard appendix: authenticity verification, additional information
- Package authenticity verification:
SuSE update packages are available on many mirror ftp servers all ove=
r
the world. While this service is being considered valuable and import=
ant
to the free and open source software community, many users wish to be
sure about the origin of the package and its content before installin=
g
the package. There are two verification methods that can be used
independently from each other to prove the authenticity of a download=
ed
file or rpm package:
1) md5sums as provided in the (cryptographically signed) announcement=
=2E
2) using the internal gpg signatures of the rpm package.
1) execute the command
md5sum <name-of-the-file.rpm>
after you downloaded the file from a SuSE ftp server or its mirror=
s.
Then, compare the resulting md5sum with the one that is listed in =
the
announcement. Since the announcement containing the checksums is
cryptographically signed (usually using the key security@suse.de),
the checksums show proof of the authenticity of the package.
We disrecommend to subscribe to security lists which cause the
email message containing the announcement to be modified so that
the signature does not match after transport through the mailing
list software.
Downsides: You must be able to verify the authenticity of the
announcement in the first place. If RPM packages are being rebuilt
and a new version of a package is published on the ftp server, all
md5 sums for the files are useless.
2) rpm package signatures provide an easy way to verify the authentic=
ity
of an rpm package. Use the command
rpm -v --checksig <file.rpm>
to verify the signature of the package, where <file.rpm> is the
filename of the rpm package that you have downloaded. Of course,
package authenticity verification can only target an uninstalled r=
pm
package file.
Prerequisites:
a) gpg is installed
b) The package is signed using a certain key. The public part of =
this
key must be installed by the gpg program in the directory
~/.gnupg/ under the user's home directory who performs the
signature verification (usually root). You can import the key
that is used by SuSE in rpm packages for SuSE Linux by saving
this announcement to a file ("announcement.txt") and
running the command (do "su -" to be root):
gpg --batch; gpg < announcement.txt | gpg --import
SuSE Linux distributions version 7.1 and thereafter install th=
e
key "build@suse.de" upon installation or upgrade, provided tha=
t
the package gpg is installed. The file containing the public k=
ey
is placed at the toplevel directory of the first CD (pubring.g=
pg)
and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de .
- SuSE runs two security mailing lists to which any interested party ma=
y
subscribe:
suse-security@suse.com
- general/linux/SuSE security discussion.
All SuSE security announcements are sent to this list.
To subscribe, send an email to
<suse-security-subscribe@suse.com>.
suse-security-announce@suse.com
- SuSE's announce-only mailing list.
Only SuSE's security annoucements are sent to this list.
To subscribe, send an email to
<suse-security-announce-subscribe@suse.com>.
For general information or the frequently asked questions (faq)
send mail to:
<suse-security-info@suse.com> or
<suse-security-faq@suse.com> respectively.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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SuSE's security contact is <security@suse.com> or <security@suse.de>.
The <security@suse.de> public key is listed below.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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_________________________________________________________________________=
____
_
The information in this advisory may be distributed or reproduced,
provided that the advisory is not modified in any way. In particular,
it is desired that the cleartext signature shows proof of the
authenticity of the text.
SuSE GmbH makes no warranties of any kind whatsoever with respect
to the information contained in this security advisory.
Type Bits/KeyID Date User ID
pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>
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--
~
~ perl self.pl
~ $_=3D'print"\$_=3D\47$_\47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
-------------------------------------------------------
--=20
e-Mail: like a letter, text only is better.
* | k | b | s | * kbs at linux.nu *