----- Original Message -----
From: "Sebastian Krahmer" <krahmer@suse.de>
To: <bugtraq@securityfocus.com>
Sent: Tuesday, August 12, 2003 8:57 AM
Subject: SuSE Security Announcement: kernel (SuSE-SA:2003:034)
> -----BEGIN PGP SIGNED MESSAGE-----
>
>
____________________________________________________________________________
__
>
> SuSE Security Announcement
>
> Package: kernel
> Announcement-ID: SuSE-SA:2003:034
> Date: Tue Aug 12 18:15:00 CEST 2003
> Affected products: 7.2, 7.3, 8.0, 8.1, 8.2
> SuSE Linux Database Server,
> SuSE eMail Server III, 3.1
> SuSE Linux Enterprise Server 7, 8
> SuSE Linux Firewall on CD/Admin host
> SuSE Linux Connectivity Server
> SuSE Linux Office Server
> SuSE Linux Openexchange Server
> SuSE Linux Desktop 1.0
> United Linux 1.0
> Vulnerability Type: local privilege escalation,
> remote Denial of Service (DoS)
> Severity (1-10): 7
> SuSE default package: yes
> Cross References: CAN-2003-0476
> CAN-2003-0501
> CAN-2003-0464
>
> Content of this advisory:
> 1) security vulnerability resolved: a race condition in the ELF
loader,
> a minor information leakage problem in the proc-fs,
> re-binding problem of UDP port 2049 sockets,
> DoS in netfilter and NFSv3 code
> 2) pending vulnerabilities, solutions, workarounds:
> - xfstt
> - heartbeat
> - KDE config files
> - several minor bug fixes
> 3) standard appendix (further information)
>
>
____________________________________________________________________________
__
>
> 1) problem description, brief discussion, solution, upgrade information
>
> During the last weeks a couple of security relevant fixes have been
> accumulated for the kernel. These fix local vulnerabilities and
> remote DoS conditions. The list of the fixed vulnerabilities is
> as follows:
>
> - fix for a possible denial of service attack (DoS) in the routing
code
> - fix for a possible attack of an unpriviledged user via ioport
> - fix for a re-binding problem of UDP port 2049 (NFS) sockets
> - fix for a kernel panic with pptpd when mss > mtu
> - fix for console redirect bug
> - fix for the execve() file read race vulnerability
> - fix for several race conditions in procfs
> - fix for possible DoS in netfilter code
> - fix for possible DoS in NFSv3 code
>
> Not all kernel-versions are affected by all of these vulnerabilities.
> However, since there is no easy workaround for all of the
vulnerabilities,
> we recommend an update of the kernel package.
>
> Please follow the steps in the "SPECIAL INSTALL INSTRUCTIONS" section
to
> update your system.
>
> Note: Managing the necessary patches, building and mostly testing
> kernel update packages is an extremely worksome and therefore also
> time-consuming process. SuSE wishes to provide the same quality and
> reliability in update packages as customers are used to from the
> shipped original products. Even though our kernel updates are
> thoroughly tested, the numerous possible hardware configurations for
the
> x86 platform give a certain probability for a functional failure of
> parts of the kernel after the update has been performed. Some of the
> possible failures cannot be handled by SuSE by definition. These
> include (and are not limited to) possible problems with NVIDIA chipset
> graphics boards that make use of hardware 3D acceleration.
> SuSE cannot deliver the binary only driver for the NVIDIA graphics
> boards in the kernel RPM. It is known that the NVIDIA hardware
acceleration
> will not continue to work after a reboot, resulting in a failure to
start
> the X-server. Hardware acceleration support for NVIDIA graphics
chipsets on
> SuSE Linux 8.1 and 8.2 will be automatically disabled if the kernel
update
> is performed by YOU (Yast Online Update). If you are committing the
update
> by hand (necessary for SuSE Linux 8.0 and older), you should either
turn
> off hardware acceleration support for your X Server configuration, or
you
> may want to link the acceleration driver with binaries directly from
> nvidia's ftp server yourself, using the provided kernel-source RPM
package.
>
> The kernel of a Linux system is the most critical component with
respect
> to stability, reliability and security. By consequence, an update of
that
> component requires some care and full attention to succeed.
>
> SPECIAL INSTALL INSTRUCTIONS:
> ==============================
> The following paragraphs will guide you through the installation
> process in a step-by-step fashion. The character sequence "****"
> marks the beginning of a new paragraph. In some cases, you decide
> if the paragraph is needed for you or not. Please read through all
> of the steps down to the end. All of the commands that need to be
> executed are required to be run as the superuser (root). Each step
> relies on the steps before to complete successfully.
>
>
> **** Step 1: Determine the needed kernel type
>
> Please use the following command to find the kernel type that is
> installed on your system:
>
> rpm -qf /boot/vmlinuz
>
> The following options are possible (disregarding the version and build
> number following the name, separated by the "-" character):
>
> k_deflt # default kernel, good for most systems.
> k_i386 # kernel for older processors and chipsets
> k_athlon # kernel made specifically for AMD Athlon(tm) family
processors
> k_psmp # kernel for Pentium-I dual processor systems
> k_smp # kernel for SMP systems (Pentium-II and above)
>
> **** Step 2: Download the package for your system
>
> Please download the kernel RPM package for your distribution with the
> name starting as indicated by Step 1. The list of all kernel rpm
> packages is appended below. Note: The kernel-source package does not
> contain any binary kernel in bootable form. Instead, it contains the
> sources that the binary kernel rpm packages are made from. It can be
> used by administrators who have decided to build their own kernel.
> Since the kernel-source.rpm is an installable (compiled) package that
> contains sources for the linux kernel, it is not the source RPM for
> the kernel RPM binary packages.
>
> The kernel RPM binary packages for the distributions can be found at
these
> locations under ftp://ftp.suse.com/pub/suse/i386/update/ :
>
> 7.2/kernel/2.4.18-20030812
> 7.3/kernel/2.4.18-20030812
> 8.0/kernel/2.4.18-20030812
> 8.1/rpm/i586
> 8.2/rpm/i586
>
> After downloading the kernel RPM package for your system, you should
> verify the authenticity of the kernel rpm package using the methods as
> listed in section 3) of each SuSE Security Announcement.
>
>
> **** Step 3: Installing your kernel rpm package
>
> Install the rpm package that you have downloaded in Steps 3 or 4 with
> the command
> rpm -Uhv --nodeps --force <K_FILE.RPM>
> where <K_FILE.RPM> is the name of the rpm package that you downloaded.
>
> Warning: After performing this step, your system will likely not be
> able to boot if the following steps have not been fully
> applied.
>
>
> If you run SuSE Linux 8.1 and use the freeswan package, you also need
> to update the freeswan rpm as a dependency as offered by YOU (Yast
> Online Update). The package can be downloaded from
> ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/
>
> **** Step 4: configuring and creating the initrd
>
> The initrd is a ramdisk that is being loaded into the memory of your
> system together with the kernel boot image by the bootloader. The
> kernel uses the content of this ramdisk to execute commands that must
> be run before the kernel can mount its actual root filesystem. It is
> usually used to initialize scsi drivers or NIC drivers for diskless
> operation.
>
> The variable INITRD_MODULES (set in the files /etc/rc.config up to
> 7.3) or /etc/sysconfig/kernel (after and including 8.0)) determines
> which kernel modules will be loaded in the initrd before the kernel
> has mounted its actual root filesystem. The variable should contain
> your scsi adapter (if any) or filesystem driver modules.
>
> With the installation of the new kernel, the initrd has to be
> re-packed with the update kernel modules. Please run the command
>
> mk_initrd
>
> as root to create a new init rmadisk (initrd) for your system.
>
>
> **** Step 5: bootloader
>
> If you have a 7.x system, you must now run the command
>
> lilo
>
> as root to initialize the lilo bootloader for your system. Then
> proceed to the next step.
>
> If you run a SuSE Linux 8.x or a SLES8 system, there are two options:
> Depending on your software configuration, you have the lilo bootloader
> or the grub bootloader installed and initialized on your system.
> The grub bootloader does not require any further actions to be
> performed after the new kernel images have been moved in place by the
> rpm Update command.
> If you have a lilo bootloader installed and initialized, then the lilo
> program must be run as root. Use the command
>
> grep LOADER_TYPE /etc/sysconfig/bootloader
>
> to find out which boot loader is configured. If it is lilo, then you
> must run the lilo command as root. If grub is listed, then your system
> does not require any bootloader initialization.
>
> Warning: An improperly installed bootloader may render your system
> unbootable.
>
> **** Step 6: reboot
>
> If all of the steps above have been successfully applied to your
> system, then the new kernel including the kernel modules and the
> initrd should be ready to boot. The system needs to be rebooted for
> the changes to become active. Please make sure that all steps are
> complete, then reboot using the command
> shutdown -r now
> or
> init 6
>
> Your system should now shut down and reboot with the new kernel.
>
>
> Download sources for all kernel RPM packages:
> Our maintenance customers are being notified individually. The
packages
> are being offered to install from the maintenance web.
>
> Due to the large amount of package-names you will not find the usual
> list of package-names with the corresponding MD5 sums here. However
the
> integrity of the packages is ensured and can be verified as described
in
> section 3.2.
>
>
____________________________________________________________________________
__
>
> 2) Pending vulnerabilities in SuSE Distributions and Workarounds:
>
> - xfstt
> The X truetype font-server can be crashed my sending
> malicious packets over the network. It may even be
> possible to execute arbitrary commands with the
> privileges of the xfstt server.
> Update packages are available on our FTP servers now.
>
> - heartbeat
> New heartbeat packages which fix an overflow are available on our
> ftp servers.
>
> - KDE config files
> Due to an mistake some files in /etc/opt/kde3/share/config/
> of SuSe Linux 8.2 are world-writeable. Under certain
> circumstances these files can be used to gain higher
> privileges. Please add an entry for each file in your
> /etc/permissions.local file. Example:
> /etc/opt/kde3/share/config/kmailrc root.root 0644
>
> This bug was reported by nordi <nordi@addcom.de>.
>
> - several minor bug fixes
> There are alot more minor security updates in the queue. YOU (Yast
> Online Update) will inform you when they appear. Alternatively you
> may want to monitor the following website:
> http://www.suse.de/de/private/download/updates/index.html
> or:
> http://www.suse.de/en/private/download/updates/index.html
>
>
____________________________________________________________________________
__
>
> 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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