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______________________________________________________________________________
SUSE Security Summary Report
Announcement-ID: SUSE-SR:2004:001
Date: Wednesday, Nov 24th 2004 12:00 MEST
Cross References: CAN-2004-0956
CAN-2004-0835
CAN-2004-0836
CAN-2004-0957
CAN-2004-0837
CAN-2004-0885
CAN-2004-0940
CAN-2004-0942
Content of this advisory:
1) solved security vulnerabilities:
- ImageMagick integer overflow in EXIF handling
- acpid directory world writable problem
- several mysql bugs
- perl-MIME-Tools mime boundary handling
- apache denial of service
- apache1 / mod_include local buffer overflow
- apache2 / mod_SSL cipher suite bypass
- tftp buffer overflows
- xpdf integer overflows
- xine-lib buffer overflows
- gd integer overflows
2) pending vulnerabilities, solutions, workarounds:
- kernel problems
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion
To avoid spamming lists with advisories for every small incident,
we will release weekly summary advisories for issues where we have
released updates without a full advisory.
Fixed packages are available on our FTP server and via
the YaST Online Update.
- ImageMagick
ImageMagick is an collection of command-line tools and libraries
to manipulate images. The EXIF JPEG tag handling routines
had a integer overflow which could lead to memory being
overwritten.
- acpid
acpid is a daemon watching for ACPI status changes and key presses.
A bad umask handling lead to acpid creating a world writable
directory.
- mysql
Several problems were found in the mysql database server.
CAN-2004-0956: Crash with MATCH..AGAINST.
CAN-2004-0835: Privilege escalation in ALTER TABLE RENAME.
CAN-2004-0836: Potential Memory Overrun With Compromised DNS Server.
CAN-2004-0957: Privilege Escalation on GRANT ALL ON `Foo\_Bar`
CAN-2004-0837: Concurrent accesses to MERGE tables can result in crash.
Also, the mysqlhotcopy /tmp file handling fix from the last
security update was broken.
- Apache
Several problems were found in the Apache web servers:
CAN-2004-0885: mod_ssl SSLCipherSuite bypass, where an attacker
could bypass a fixed list of ciphers and use a
less secure one.
CAN-2004-0940: mod_include local buffer overflow, where a local
attacker could execute code in the local apache
process if mod_include is enabled.
CAN-2004-0942: Fix of memory consumption denial of service attack
with HTTP continuation headers.
We are in the process of releasing packages.
- perl-MIME-Tools
The perl-MIME-Tools are perl modules that do parsing of MIME
E-mail bodies. These modules are used for instance by the
amavisd-new and potentially other virus scanners.
Due to an input error handling, some attachments can bypass
the virus scanner.
- tftp
The tftp daemon had several buffer overflows, which could potentially
be used by a remote attacker to gain local access.
- xpdf
We released xpdf buffer and integer overflow patches some weeks
ago. We found that these fixes still have problems on 64 bit
systems.
Additional fixes were done by us and we are in the process of
releasing updates, for xpdf, gpdf, pdftohtml, cups (which
includes pdftops) and tetex (which also contains xpdf code).
- xine-lib
Several string based overflows were found in the XINE libraries.
This is issue is tracked by the Xine security ID XSA-2004-4.
- gd
An integer overflow that might lead to a buffer overflow was
found in the PNG image loader routines of the GD graphics library.
______________________________________________________________________________
2) Pending vulnerabilities in SUSE Distributions and Workarounds:
- kernel
Several problems have been found in the Linux 2.4 and 2.6
kernels:
- Several overflow checks in the smbfs handling of both Linux
2.4 and 2.6 were found missing by Stefan Esser.
- Handcrafted a.out binaries could be used to trigger a local
denial of service condition in both 2.4 and 2.6 Linux kernels.
Fixes for this problem were done by Chris Wright.
- A very small race window was found in the memory management of
the kernel which could be used to show the content of random
physical memory pages potentially leading to information
disclosure.
This bug affects all SUSE distributions.
We are in the process of preparing updated packages.
______________________________________________________________________________
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
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 recommend against subscribing to security lists that cause the
e-mail 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
to verify the signature of the package, where is the
file name of the rpm package that you have downloaded. Of course,
package authenticity verification can only target an uninstalled 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-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
.
For general information or the frequently asked questions (FAQ)
send mail to:
or
respectively.
=====================================================================
SUSE's security contact is or .
The 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
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key
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