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Sicherheit: Endlosschleife in tcpdump
Aktuelle Meldungen Distributionen
Name: Endlosschleife in tcpdump
ID: SuSE-SA:2004:002
Distribution: SUSE
Plattformen: SUSE eMail Server III, SUSE Linux Enterprise Server 7, SUSE Linux 8.0, SUSE Firewall Adminhost VPN, SUSE Linux Admin-CD for Firewall, SUSE Linux Office Server, SUSE Linux 8.1, SUSE Firewall on CD 2, SUSE Firewall on CD 2 - VPN, SUSE Linux Enterprise Server 8, SUSE UnitedLinux 1.0, SUSE Linux 8.2, SUSE Linux Desktop 1.0, SUSE Linux Standard Server 8, SUSE Linux 9.0, SUSE SLES 8 for IBM iSeries and IBM pSeries, SUSE Linux School Server for i386
Datum: Do, 15. Januar 2004, 12:00
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0989
http://www.tcpdump.org
Applikationen: tcpdump

Originalnachricht

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

______________________________________________________________________________

SUSE Security Announcement

Package: tcpdump
Announcement-ID: SuSE-SA:2004:002
Date: Wed Jan 14 14:00:00 MET 2004
Affected products: 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
UnitedLinux 1.0
Vulnerability Type: remote DoS
Severity (1-10): 3
SUSE default package: yes
Cross References: http://www.tcpdump.org
CAN-2003-0989

Content of this advisory:
1) security vulnerability resolved: remote DoS condition in tcpdumps
ISAKMP handling
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- opera
- mc
- mod_gzip
- tripwire
- cvs
- gnome-filesystem
- XDM (XFree86, xf86)
- inn
- mpg321
- popper
- kdepim3
- pin
- 3ddiag
- mod_auth_shadow
3) standard appendix (further information)

______________________________________________________________________________

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

Tcpdump is a well known tool for administrators to analyze network
traffic.
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:

SuSE-9.0:
tcpdump-3.7.2-72.i586.rpm
a4395d7d819ea8918778f9a3b91c297c
patch rpm(s):
tcpdump-3.7.2-72.i586.patch.rpm
4eae84a6074af7c2386f9145a49f9477
source rpm(s):
tcpdump-3.7.2-72.src.rpm
b32b0e08e9add34b3c42599734723454

SuSE-8.2:
tcpdump-3.7.1-341.i586.rpm
39c8e448e4056111444658ce93281ca3
patch rpm(s):
tcpdump-3.7.1-341.i586.patch.rpm
dfcb12acdad084fcf15508361a3018b5
source rpm(s):
tcpdump-3.7.1-341.src.rpm
b92c579649acc9fb19810bcc7a670d6d

SuSE-8.1:
tcpdump-3.7.1-341.i586.rpm
5527a4823b041894324ae65b02e40011
patch rpm(s):
tcpdump-3.7.1-341.i586.patch.rpm
f4c933fd520dbcab98092e5a2fe8846c
source rpm(s):
tcpdump-3.7.1-341.src.rpm
0b118d8fe78cea0cc2405a934a77b7fd

SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/tcpdump-3.6.2-330.i386.rpm
d77a4e84796cc96be12c97ea19d272bb
patch rpm(s):
tcpdump-3.6.2-330.i386.patch.rpm
74882ed085cc27c938ed5529df8040c4
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/tcpdump-3.6.2-330.src.rpm
51f39911dadd7add63e07a922840314c

Opteron x86_64 Platform:

SuSE-9.0:
tcpdump-3.7.2-68.x86_64.rpm
0278d04abfe2bcffca8f45e711beebd0
patch rpm(s):
tcpdump-3.7.2-68.x86_64.patch.rpm
348b217551a35a6e4f9698e92f3170c8
source rpm(s):
tcpdump-3.7.2-68.src.rpm
2deb0ae848d115e00593a5639ec5b6b8


______________________________________________________________________________

2) Pending vulnerabilities in SUSE Distributions and Workarounds:

- 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 released soon.

- 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 servers.

- 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 FTP servers.

- 3ddiag
Some 3ddiag scripts handle temporary files in an insecure manner.
Thanks to Stefan Nordhausen <nordhaus at informatik.hu-berlin.de>
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 mod_gzip.

______________________________________________________________________________

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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