81169 2002-10-15 02:55 /310 rader/ Olaf Kirch <okir@suse.de>
Importerad: 2002-10-15 02:55 av Brevbäraren
Extern mottagare: bugtraq@securityfocus.com
Mottagare: Bugtraq (import) <1926>
Ärende: SuSE Security Announcement: Heartbeat (SuSE-SA:2002:037)
------------------------------------------------------------
-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: heartbeat
Announcement-ID: SuSE-SA:2002:037
Date: Monday, Oct 14, 12:00 UTC
Affected products: 8.0, 8.1
Vulnerability Type: remote root
Severity (1-10): 7
SuSE default package: yes
Cross References: http://linux-ha.org/security/sec01.txt
Content of this advisory:
1) security vulnerability resolved: format string bug in heartbeat
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- util-linux
- dhcpcd
- heimdal
- logsurfer
- ghostscript
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade
information
Heartbeat is a monitoring service that is used to implement
failover in high-availablity environments. It can be configured to
monitor other systems via serial connections, or via UDP/IP.
Several format string bugs have been discovered in the heartbeat
package. One of these format string bugs is in the normal path
of execution, all the remaining ones can only be triggered if
heartbeat is running in debug mode. Since heartbeat is running
with root privilege, this problem can possibly be exploited by
remote attackers, provided they are able to send packets to the
UDP port heartbeat is listening on (port 694 by default).
Vulnerable versions of heartbeat are included in SuSE Linux 8.0
and SuSE Linux 8.1.
As a workaround, make sure that your firewall blocks all traffic
to the heartbeat UDP port.
The proper fix is to upgrade to the packages provided by SuSE.
In addition to fixing the format string bug, this update also
changes heartbeat to perform processing of network packets as
user "nobody" instead of root. The update package for SuSE Linux
8.1 also fixes a boot time problem with heartbeat.
SuSE wishes to thank Nathan Wallwork for reporting the bug, and
Alan Robertson for his assistance in dealing with this
problem. For more information on this vulnerability, please refer
to http://linux-ha.org/security/sec01.txt
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.
i386 Intel Platform:
SuSE-8.1
- being rebuilt
SuSE-8.0
ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap5/heartbeat-0.4.9.1-159.i386.rpm
510f5a4c4c094ef0a98d46c53deae660
ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap5/heartbeat-ldirectd-0.4.9.1-159.i386.rpm
86e1d5ae00efedfeb7e29e47cec973f6
ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap5/heartbeat-stonith-0.4.9.1-159.i386.rpm
3067c26bd4a861e255b8e9dc74aad050
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/heartbeat-0.4.9.1-159.src.rpm
e1df88a1af12d5e13cabc2662248f2c2
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- util/util-linux The mount and umount program did not set their
umask properly before creating the mtab file. Local attackers
could abuse the mount program to put arbitrary content into the
/etc/mtab file. New packages are available on our ftp servers
which fix this problem. An update is recommended.
- dhcpcd
The dhcpcd DHCP client daemon has the ability to execute an
external script named /sbin/dhcpcd-<interface>.exe when assigning
a new IP address. It is not installed by default, however.
The script obtains the DHCP information by sourcing a file named
/var/lib/dhcpcd/dhcpcd-<interface>.info, containing a list
of shell variable assignments. Insufficient quoting of these
assignments allowed malicious DHCP servers (or attackers able
to spoof DHCP responses) to execute arbitrary shell commands on
the DHCP client if the user had installed the script.
- heimdal Within the SuSE Advisory SuSE-SA:2002:034 regarding the
Heimdal packages, the following rpm was missing in the list:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec1/heimdal-lib-0.4d-132.i386.rpm
7356a6c07dfe91d968939f6f52a5879d
If you updated the Heimdal packgages for SuSE 7.3-i386, make sure
you also update this package.
- logsurfer
New logsurfer (logsurf in SuSE-7.0) packages are available for
download. These packages fix two errors (off-by-one overflow,
uninitialized memory) in the logsurfer package that can lead to
a crash of the program, resulting in a denial of service. It is
unknown if the two bugs can be used to execute arbitrary code in
the context of the logsurfer program.
- ghostscript (CVE CAN-2002-0363) In ghostscript 6.50, setting
the interpreter to SAFE mode was reversible. This could be
exploited to subvert the accounts of users viewing malicious
PostScript[tm], as well as the lp acount if the print system was
enabled. SuSE has released updated RPMs for SuSE Linux 7.3 and
SuSE Linux Enterprise Server 7 for PowerPC. No other SuSE
platform is affected.
- gv/ggv/kghostview (CVE CAN-2002-0832) The ghostview (gv) code
had several buffer overflows when handling PostScript[tm]
structural comments. These were also present in the GNOME and KDE
PostScript viewers derived from it. SuSE has released fixed
packages for these vulnerabilities.
______________________________________________________________________________
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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(81169) /Olaf Kirch <okir@suse.de>/-------(Ombruten)