SUSE Linux Advisory: tcpdump
Jan 14, 2004, 21:56 (0 Talkback[s])
SUSE Security Announcement
||Wed Jan 14 14:00:00 MET 2004
||8.0, 8.1, 8.2, 9.0
SuSE eMail Server III
SuSE Firewall Adminhost VPN
SuSE Linux Admin-CD for Firewall
SuSE Firewall on CD 2 - VPN
SuSE Firewall on CD 2
SuSE Linux Enterprise Server 7
SLES 8 for IBM iSeries and IBM pSeries
SuSE Linux Enterprise Server 8
SuSE Linux Desktop 1.0
SuSE Linux School Server for i386
SuSE Linux Standard Server 8
SuSE Linux Office Server
|SUSE default package:
Content of this advisory:
- security vulnerability resolved: remote DoS condition in
tcpdumps ISAKMP handling problem description, discussion, solution
and upgrade information
- pending vulnerabilities, solutions, workarounds:
- XDM (XFree86, xf86)
- standard appendix (further information)
1) problem description, brief discussion, solution, upgrade
Tcpdump is a well known tool for administrators to analyze
There is a bug in the tcpdump code responsible for handling ISAKMP
messages. This bug allows remote attackers to destroy a current
tcpdump session by tricking the tcpdump program with evil ISAKMP
messages to enter an endless loop.
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:
Opteron x86_64 Platform:
2) Pending vulnerabilities in SUSE Distributions and
- Opera web browser The SuSE Security Team has discovered a flaw
in the Opera web browsers X.509 certificate handling during the SSL
handshake. It allows attackers to prompt the Opera web browser with
invalid certificates containing the public key of the attacker.
Thus, he can read or modify the HTTPS traffic without notification
by the user. New packages fixing this problem will be available
soon on our ftp servers.
- mc By using a special combination of links in archive-files it
is possible to execute arbitrary commands while mc tries to open it
in its VFS. The packages will be released soon.
- mod_gzip (apache-contrib) The apache module mod_gzip is
vulnerable to remote code execution while running in debug-mode. We
do not ship this module in debug-mode but future versions will
include the fix. Additionally the mod_gzip code was audited to fix
more possible security related bugs. After more testing a new
apache-contrib RPM package will be released.
- tripwire Tripwire is a file integrity checker. The tripwire
version on SuSE Linux 8.2 and 9.0 do crash when a requested file
does not exists. New packages will be available soon.
- cvs The cvs server-side can be tricked to create files in the
root filesystem of the server by requesting malformed modules. The
permissions on the root filesystem normally prevent this
malfunction. Additionally the package will include a fix for a
format-string bug. New packages will be available soon.
- gnome-filesystem A script included in the gnome-filesystem
package handles temporary files insecurely. This script is called
by YaST2 with root privileges. The bug can be exploited locally to
create or overwrite arbitrary files in the filesystem. The bug is
fixed in our current source-tree since November 2003 but
nevertheless update packages for older SuSE Linux versions will be
- XDM (XFree86, xf86) A missing check for failure conditions in
the PAM code of XDM can lead to local root access in conjunction
with Kerberos and alike. New packages will be released soon.
- inn A buffer overflow in the code for handling control messages
can be exploited remotely. New packages are available on our FTP
- mpg321 A format-bug in mpg321 can be exploited (even remotely
by HTTP streaming) to execute code with the permissions of the user
running mpg321 on special MP3 files. New packages are available on
our FTP servers.
- popper Popper handles temporary files in an insecure manner.
New packages are available on our FTP servers.
- kdepim3 It was possible to use a buffer overflow via a special
crafted vcard file to run code during generating previews. By
default it was only possible on local filesystems, but the user can
enable this also for remote file systems. New packages are
available on our FTP servers.
- pin Pin handles local temporary files in an insecure manner
which may lead to local privilege escalation. Thanks to Stefan
Nordhausen <nordhaus at informatik.hu-berlin.de/>
for reporting one of the issues. New packages are available on our
- 3ddiag Some 3ddiag scripts handle temporary files in an
insecure manner. Thanks to Stefan Nordhausen <nordhaus at
for reporting some of the issues. New packages will be available on
our FTP servers soon.
- mod_auth_shadow (apache-contrib) This apache module ignores
account expiration dates. The update will be released together with
3) standard appendix: authenticity verification, additional
- 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:
- md5sums as provided in the (cryptographically signed)
- using the internal gpg signatures of the rpm package.
- 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 firstname.lastname@example.org), 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.
- 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:
- gpg is installed
- 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 "email@example.com"
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's security contact is <firstname.lastname@example.org
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.
||SuSE Security Team <email@example.com>
||SuSE Package Signing Key <firstname.lastname@example.org>