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The Heimdal package is a free Kerberos implementation offering flexible authentication mechanisms based on the Kerberos 5 and Kerberos 4 scheme. The SuSE Security Team has reviewed critical parts of the Heimdal package such as the kadmind and kdc server. While doing so several possible buffer overflows and other bugs have been uncovered and fixed. Remote attackers can probably gain remote root access on unpatched systems. Since these services run usually on authentication servers we consider these bugs to be very serious. An update is strongly recommended if you are using the Heimdal package.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: heimdal
Announcement-ID: SuSE-SA:2002:034
Date: Mon Sep 30 17:00:00 CEST 2002
Affected products: SuSE Linux 7.2, 7.3, 8.0,
SuSE eMail Server,
SuSE Linux Connectivity Server,
SuSE Linux Enterprise Server 7,
SuSE Linux Office Server
Vulnerability Type: remote command execution
Severity (1-10): 8
SuSE default package: Yes
Cross References: http://www.pdc.kth.se/heimdal
Content of this advisory:
1) security vulnerability resolved: Various overflows in heimdal.
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- ghostview/kghostview
- fetchmail
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
The Heimdal package is a free Kerberos implementation offering flexible
authentication mechanisms based on the Kerberos 5 and Kerberos 4 scheme.
The SuSE Security Team has reviewed critical parts of the Heimdal
package such as the kadmind and kdc server. While doing so several
possible buffer overflows and other bugs have been uncovered and fixed.
Remote attackers can probably gain remote root access on unpatched systems.
Since these services run usually on authentication servers we consider
these bugs to be very serious. An update is strongly recommended if you are
using the Heimdal 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.
To be sure the update takes effect you have to restart the services which
belong to the heimdal package. As root execute the command
/etc/rc.d/kdc restart
If you are running other Kerberos based services such as hpropd make sure
you also restart them as well.
i386 Intel Platform:
SuSE-8.0
ftp://ftp.suse.com/pub/suse/i386/update/8.0/d4/heimdal-devel-0.4e-191.i386.rpm
9dcb318864c2ad7c8bb11a51b0c1e12a
ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/heimdal-lib-0.4e-191.i386.rpm
7971b5a482b0f8521c0a8bd07182be36
ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec3/heimdal-0.4e-191.i386.rpm
fb6792204a9ec58f69a9dc7b4bcbed59
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/heimdal-0.4e-191.src.rpm
976383f4b7eeabcfc48ab4360a14586f
SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec2/heimdal-0.4d-132.i386.rpm
d2f174640a8d3b976eef3ff3afb642ee
ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec2/heimdal-devel-0.4d-132.i386.rpm
fad86035d9b94aa50a9225c9e40618da
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/heimdal-0.4d-132.src.rpm
5d3afb07af86563e5eff5f0fad6113d4
SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec1/heimdal-lib-0.3e-83.i386.rpm
7a5f3f3e1c16481b6dea589bedd7ee44
ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec2/heimdal-0.3e-83.i386.rpm
f94d2a88a2100b2b28496b1a8f3030c4
ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec2/heimdal-devel-0.3e-83.i386.rpm
d4fa5f75cb1d422fe439a276fdfe8aca
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/heimdal-0.3e-83.src.rpm
a42a3535e0bd5966eb8b9d017213dfb5
Sparc Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec1/heimdal-lib-0.4d-67.sparc.rpm
c50802492db0e8728d666f3b38b7ca5e
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec2/heimdal-0.4d-67.sparc.rpm
595d21ca05b8c886c0887189bb76487d
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec2/heimdal-devel-0.4d-67.sparc.rpm
1dfe9d49c83303ddf3490497dffce7fa
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/heimdal-0.4d-67.src.rpm
7c61896ca257f79656e35bc59e1de734
PPC Power PC Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec1/heimdal-lib-0.4d-113.ppc.rpm
e905e8c468b9eddef6b8a785d5241914
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec2/heimdal-0.4d-113.ppc.rpm
7b816aa786118e481be811be6974177f
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec2/heimdal-devel-0.4d-113.ppc.rpm
100f9fbe35d82dcf02aed98aa70103b8
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/heimdal-0.4d-113.src.rpm
24467d712a359516ae60462c56dc97df
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- ghostview/kghostview
Bufferoverflows have recently been discovered in these packages. They allow
attackers to execute arbitrary code with the privileges of the user
viewing special crafted documents created by the attacker. New packgaes will
soon be available on our ftp servers.
- fetchmail
Fetchmail contains remotely exploitable overflows in the mail header
parsing functions. In depth discussion of these problems can be found at
http://security.e-matters.de/advisories/032002.html.
New packages will soon be available on our ftp servers.
______________________________________________________________________________
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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