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Sicherheit: Ausführen beliebigen Codes in xfree86
Aktuelle Meldungen Distributionen
Name: Ausführen beliebigen Codes in xfree86
ID: SuSE-SA:2002:032
Distribution: SUSE
Plattformen: Keine Angabe
Datum: Do, 19. September 2002, 13:00
Referenzen: http://www.xfree.org/security
Applikationen: XFree86

Originalnachricht

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

SuSE Security Announcement

Package: xf86
Announcement-ID: SuSE-SA:2002:032
Date: Wed Sep 18 12:00:00 MEST 2002
Affecte products: SuSE Linux 8.0
Vulnerability Type: local privilege escalation
Severity (1-10): 5
SuSE default package: yes
Cross References: http://www.xfree.org/security

Content of this advisory:
1) security vulnerability resolved: LD_PRELOAD vulnerability in the X11
library
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- Perl 5.6.1 glob overflow fix
- new OpenSSH packages
- sparc info
3) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion, solution, upgrade information

The xf86 package contains various libraries and programs which are
fundamental for the X server to function.
The libX11.so library from this package dynamically loads other libraries
where the pathname is controlled by the user invoking the program linked
against libX11.so. Unfortunately, libX11.so also behaves the same way when
linked against setuid programs. This behavior allows local users to
execute arbitrary code under a different UID which can be the root-UID in
the worst case.
libX11.so has been fixed to check for calls from setuid programs. It
denies loading of user controlled libraries in this case.
We recommend an update in any case since there is no easy workaround
possible except removing the setuid bit from any program linked against
libX11.so.

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
ftp://ftp.suse.com/pub/suse/i386/update/8.0/x1/xshared-4.2.0-174.i386.rpm
2a515055a811de5b465d016ffa77a09c
ftp://ftp.suse.com/pub/suse/i386/update/8.0/x2/xdevel-4.2.0-174.i386.rpm
67ddeb24b04b8c2badb7a039d9ea270e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/xf86-4.2.0-174.src.rpm
e44b3f6dd4a406bd422adc4f7fac63f2

______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- perl
New Perl 5.6.1 packages will soon be available which fix overflows
in the globbing code of the Perl interpreter. Although we believe
that there is not much impact by this bug, we recommend an update
especially on systems offering remote services based on Perl.

- openssh
New openssh packages are available for the SuSE Linux distributions
7.0 - 7.3 (version 2.9.9p2). These packages have been rebuilt to
contain the fixes in the openssl library, which is used by openssh.
It is possible but not proven that the weaknesses in the openssl code
(fixed and announced by SuSE-SA:2002:027) can be exploited in any way.
We release the packages to prevent the possibility that the
vulnerability exists. It is recommended to install the updates.

- sparc
Due to a lack of build power on the sparc architecture, we will
discontinue providing security updates for the SuSE Linux 7.0 and 7.1
distributions for sparc. We estimate that more than 95% of all SuSE
Linux for sparc users use the most recent version 7.3 so that the loss
should be considerably small.
In addition to the update directories on ftp.suse.com, we will also
move the directories containing the distributions themselves into the
discontinued/ tree on ftp.suse.com/pub/suse/discontinued/. By
consequence, all updates will continue to be available, but the path
indicates that these directories and files will remain there for
archiving purposes only.
Please note that mirrors of the SuSE ftp server ftp.suse.com might not
contain the discontinued/ directory tree.

______________________________________________________________________________

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 un-installed 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 top-level 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 announcements 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 clear-text signature shows proof of the
authenticity of the text.
SuSE Linux AG 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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