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Sicherheit: Ungeprüfte DHCP-Daten in suseconfig
Aktuelle Meldungen Distributionen
Name: Ungeprüfte DHCP-Daten in suseconfig
ID: SuSE-SA:2002:016
Distribution: SUSE
Plattformen: SUSE Linux 8.0
Datum: Fr, 10. Mai 2002, 13:00
Referenzen: Keine Angabe
Applikationen: sysconfig

Originalnachricht

-----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-dhcp.
problem description, discussion, solution and upgrade information
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 obtained 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 for 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 users using
DHCP should update their sysconfig package.

Please download the update package for your distribution and verify its
integrity by the methods listed in section 3) of this announcement.
Then, install the package using the command "rpm -Fhv file.rpm" to
apply
the update.
Our maintenance customers are being notified individually. The packages
are being offered to install from the maintenance web.

i386 Intel Platform:

SuSE-8.0
sysconfig-0.23.14-60.i386.rpm
4d6a9f1a3e1a461ebbea9a6e98f4e894
source rpm:
sysconfig-0.23.14-60.src.rpm
d0fdfe02cfc9b7fc32fed8da6c16cf9d

______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- mozilla/netscape
The mozilla browser in version 0.9.7 or higher and the netscape browser
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-overflow
which allows remote attackers to execute arbitrary commands as the user
running the server. The overflow has been fixed and new xpilot packages
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 over
the world. While this service is being considered valuable and important
to the free and open source software community, many users wish to be
sure about the origin of the package and its content before installing
the package. There are two verification methods that can be used
independently from each other to prove the authenticity of a downloaded
file or rpm package:
1) md5sums as provided in the (cryptographically signed) announcement.
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 mirrors.
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 authenticity
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 rpm
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 the
key "build@suse.de" upon installation or upgrade, provided
that
the package gpg is installed. The file containing the public key
is placed at the toplevel directory of the first CD (pubring.gpg)
and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de .


- SuSE runs two security mailing lists to which any interested party may
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.

=====================================================================
SuSE's security contact is <security@suse.com> or
<security@suse.de>.
The <security@suse.de> public key is listed below.
=====================================================================
______________________________________________________________________________

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
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~



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