SUSE Security Announcement: kernel (SUSE-SA:2004:020)

2004-07-0300:00:00

vulners.com

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                    SUSE Security Announcement

    Package:                kernel
    Announcement-ID:        SUSE-SA:2004:020
    Date:                   Tuesday, Jul 2nd 2004 18:00 MEST
    Affected products:      8.0, 8.1, 8.2, 9.0, 9.1
                            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
    Vulnerability Type:     local privilege escalation
    Severity &#40;1-10&#41;:        6
    SUSE default package:   yes
    Cross References:       CAN-2004-0495
                            CAN-2004-0496
                            CAN-2004-0497
                            CAN-2004-0535
                            CAN-2004-0626


Content of this advisory:
    1&#41; security vulnerability resolved:
            - chown: users can change the group affiliation of arbitrary
              files to the group they belong to
            - missing DAC check in chown&#40;2&#41;: local privilege escalation
            - overflow with signals: local denial-of-service
            - pss, mpu401 sound driver: read/write to complete memory
            - airo driver: read/write to complete memory
            - ALSA: copy_from_user/copy_to_user confused
            - acpi_asus: read from random memory
            - decnet: write to memory without checking
            - e1000 driver: read complete memory
       problem description, discussion, solution and upgrade information
    2&#41; pending vulnerabilities, solutions, workarounds:
            - icecast
            - sitecopy
            - cadaver
            - OpenOffice_org
            - tripwire
            - postgresql*
            - mod_proxy
            - freeswan
            - ipsec-tools
            - less
            - libpng
            - pavuk
            - XFree86*
            - kdebase3
    3&#41; standard appendix &#40;further information&#41;

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

Multiple security vulnerabilities are being addressed with this security
update of the Linux kernel.

Kernel memory access vulnerabilities are fixed in the e1000, decnet, 
acpi_asus, alsa, airo/WLAN, pss and mpu401 drivers. These 
vulnerabilities can lead to kernel memory read access, write access 
and local denial of service conditions, resulting in access to the 
root account for an attacker with a local account on the affected 
system.

Missing Discretionary Access Control &#40;DAC&#41; checks in the chown&#40;2&#41; system
call allow an attacker with a local account to change the group
ownership of arbitrary files, which leads to root privileges on affected
systems. It is specific to kernel version 2.6 based systems such as 
the SUSE Linux 9.1 product, that only local shell access is needed to 
exploit this vulnerability. An interesting variant of the missing 
checks is that the ownership of files in the /proc filesystem can be 
altered, while the changed ownership still does not allow the files to 
be accessed as a non-root user for to be able to exploit the 
vulnerability. Systems that are based on a version 2.4 kernel are not 
vulnerable to the /proc weakness, and exploitation of the weakness 
requires the use of the kernel NFS server &#40;knfsd&#41;. If the knfsd NFS 
server is not activated &#40;it is off by default&#41;, the vulnerability is 
not exposed. These issues related to the chown&#40;2&#41; system call have been 
discovered by Michael Schroeder and Ruediger Oertel, both SUSE LINUX.

The only network-related vulnerability fixed with the kernel updates
that are subject to this announcement affect the SUSE Linux 9.1 
distribution only, as it is based on a 2.6 kernel. Found and reported 
to bugtraq by Adam Osuchowski and Tomasz Dubinski, the vulnerability 
allows a remote attacker to send a specially crafted TCP packet to a 
vulnerable system, causing that system to stall if it makes use of 
TCP option matching netfilter rules.

In some rare configurations of the SUSE Linux 9.1 distribution, some 
users have experienced stalling systems during system startup. These 
problems are fixed with this kernel update.



SPECIAL INSTALL INSTRUCTIONS:
==============================
For the impatient: Run YOU &#40;Yast2 Online Update, command 
&quot;yast2 online_update&quot; as root&#41; to install the updates &#40;semi&#41; 
automatically, if you have a SUSE Linux 8.1 and newer system.

For those who wish to install their kernel updates manually and for 
those who use a SUSE Linux 8.0 system:

The following paragraphs will guide you through the installation
process in a step-by-step fashion. The character sequence &quot;****&quot;
marks the beginning of a new paragraph. In some cases, the steps
outlined in a particular paragraph may or may not be applicable
to your situation.
Therefore, please make sure to read through all of the steps below
before attempting any of these procedures.
All of the commands that need to be executed are required to be
run as the superuser &#40;root&#41;. Each step relies on the steps before
it 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

Following are the possible kernel types &#40;disregard the version and
build number following the name separated by the &quot;-&quot; character&#41;

  k_deflt   # default kernel, good for most systems.
  k_i386    # kernel for older processors and chipsets
  k_athlon  # kernel made specifically for AMD Athlon&#40;tm&#41; family processors
  k_psmp    # kernel for Pentium-I dual processor systems
  k_smp     # kernel for SMP systems &#40;Pentium-II and above&#41;
  k_smp4G   # kernel for SMP systems which supports a maximum of 4G of RAM
  kernel-64k-pagesize
  kernel-bigsmp
  kernel-default
  kernel-smp

**** Step 2: Download the package for your system

Please download the kernel RPM package for your distribution with the
name as indicated by Step 1. The list of all kernel rpm packages is
appended below. Note: The kernel-source package does not
contain a binary kernel in bootable form. Instead, it contains the
sources that the binary kernel rpm packages are created from. It can be
used by administrators who have decided to build their own kernel.
Since the kernel-source.rpm is an installable &#40;compiled&#41; 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 the
locations below ftp://ftp.suse.com/pub/suse/i386/update/.

  8.0/images/
  8.1/rpm/i586
  8.2/rpm/i586
  9.0/rpm/i586
  9.1/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&#41; 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 &lt;K_FILE.RPM&gt;
where &lt;K_FILE.RPM&gt; 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
         followed.


If you run SUSE LINUX 8.1 and haven&#39;t applied the kernel update
&#40;SUSE-SA:2003:034&#41;, AND you are using the freeswan package, you also
need to update the freeswan rpm as a dependency as offered
by YOU &#40;YaST Online Update&#41;. 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 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 in /etc/sysconfig/kernel 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 &#40;if any&#41; 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 ramdisk &#40;initrd&#41; for your system.
On SuSE Linux 8.1 and later, this is done automatically when the
RPM is installed.

**** Step 5: bootloader

If you run a SUSE LINUX 8.x, SLES8, or SUSE LINUX 9.x system, there
are two options:
Depending on your software configuration, you have either 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 completed on 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 have
completed, then reboot using the command
    shutdown -r now
or
    init 6

Your system should now shut down and reboot with the new kernel.


There is no workaround known.


Please download the update package for your distribution and verify its
integrity by the methods listed in section 3&#41; of this announcement.
Then, install the package using the command &quot;rpm -Fhv file.rpm&quot; to apply
the update.
Our maintenance customers are being notified individually. The packages
are being offered to install from the maintenance web.





x86 Platform:

SUSE Linux 9.1:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-default-2.6.5-7.95.i586.rpm
  800418d3dddf6d3b83925f562842205a
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-smp-2.6.5-7.95.i586.rpm
  0cb990b159e10685bb29b76d312ddd25
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-bigsmp-2.6.5-7.95.i586.rpm
  7446bb70f52bce57a914066be4ed8e45
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-bigsmp-2.6.5-7.95.i586.rpm
  7446bb70f52bce57a914066be4ed8e45
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-source-2.6.5-7.95.i586.rpm
  ede031495ee19d8b6eca1873e7155332
source rpm&#40;s&#41;:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-default-2.6.5-7.95.nosrc.rpm
  620ef40226fec31a773397cf3051bf36
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-smp-2.6.5-7.95.nosrc.rpm
  9b61b5a70b304f5554cb18a6bae5b5fd
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-bigsmp-2.6.5-7.95.nosrc.rpm
  227c85280ee17a66c8590fe1bb14c596
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-source-2.6.5-7.95.src.rpm
  895fee3033de0810ff1173ce8ee87936

SUSE Linux 9.0:
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_deflt-2.4.21-231.i586.rpm
  48be395b96329909486ae3a5152348fa
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_athlon-2.4.21-231.i586.rpm
  4cd322b4f511d5fe4c483ed28a82097e
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp-2.4.21-231.i586.rpm
  262e33cebf1b0d35fb6d3235c9ab8815
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp4G-2.4.21-231.i586.rpm
  8d81370f90736b12aa71b9c744f6e0e2
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_um-2.4.21-231.i586.rpm
  bc59c838c84ba318dc4d24da08a3022e
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/kernel-source-2.4.21-231.i586.rpm
  f9586ba982e0398c3e48871955b661aa
source rpm&#40;s&#41;:
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_deflt-2.4.21-231.src.rpm
  18673b0bf347fe9557d4e67ca02000c0
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_athlon-2.4.21-231.src.rpm
  71496daac44196b0e0a3836ee6a3b4ed
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp-2.4.21-231.src.rpm
  7c208e9e3f7be1a68c3c8457eb2cafc4
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp4G-2.4.21-231.src.rpm
  b77863c863aaf4b931bff263220e6ec9
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_um-2.4.21-231.src.rpm
  bed7e964e22c5e5d2f5e7a5e3816dde4
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/kernel-source-2.4.21-231.src.rpm
  6b5137bf379fbfc861441151039575da

SUSE Linux 8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_deflt-2.4.20-115.i586.rpm
  50d261b44616f9145a0dc16df501a504
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_athlon-2.4.20-115.i586.rpm
  10095854c0bdae20991d90b822352e14
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_smp-2.4.20-115.i586.rpm
  a2ef7cfb0e62ad955dda2b0574eb3150
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_psmp-2.4.20-115.i586.rpm
  1d2b0d0e2c7998685ed04c24e593b196
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/kernel-source-2.4.20.SuSE-115.i586.rpm
  d8bf98c46ba5313db286d5706f7fb3b8
source rpm&#40;s&#41;:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_deflt-2.4.20-115.src.rpm
  e13a7b4c2b185cfeb991c31607f79ccb
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_athlon-2.4.20-115.src.rpm
  0e2f2cf20e7d7a20f3e50b245105df61
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_smp-2.4.20-115.src.rpm
  6cfac2914d3827ec562ff9d6be29c566
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_psmp-2.4.20-115.src.rpm
  afd29843aa69d805ef5f25d39ecd0e7f
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/kernel-source-2.4.20.SuSE-115.src.rpm
  098a1400a48404931acb8b3eb2e821fb

SUSE Linux 8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_deflt-2.4.21-231.i586.rpm
  3bdaa593d09a7cbff632a2c4446d5603
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_athlon-2.4.21-231.i586.rpm
  ba60d0b2b6d3bc9c38b4e8b3859e1586
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_smp-2.4.21-231.i586.rpm
  ffa8983669004826a0cbedbe34dced76
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_psmp-2.4.21-231.i586.rpm
  25174fd007f5a39ee0342dd6f18f2eaa
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/kernel-source-2.4.21-231.i586.rpm
  10837fa561cd5104e55d48e46c837764
source rpm&#40;s&#41;:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_deflt-2.4.21-231.src.rpm
  c37e8b87819602e77b14206affef00fa
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_athlon-2.4.21-231.src.rpm
  7be68a677db5a65be1a46ec194b35497
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_smp-2.4.21-231.src.rpm
  8e4b7d5a6bb81da5a00971cdcc4ec641
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_psmp-2.4.21-231.src.rpm
  d8ba1db81a9b517f867c970e4fc443a7
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/kernel-source-2.4.21-231.src.rpm
  96a0a9242d066083c7bff8e0f70b7bbe

SUSE Linux 8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_deflt-2.4.18-303.i386.rpm
  ec1e53b3812c0c0bd3681435d69fb134
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_smp-2.4.18-303.i386.rpm
  583164e52019ae090fd47e425c2a933e
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_psmp-2.4.18-303.i386.rpm
  9ac8983abef05697d75f3117e37e5f18
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_i386-2.4.18-303.i386.rpm
  4932c4d6a42fc9be02013f398ab5bb96
ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/kernel-source-2.4.18.SuSE-303.i386.rpm
  b9de0731f9bbc4b016455a6d52cd8296
source rpm&#40;s&#41;:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_deflt-2.4.18-303.src.rpm
  a73bacad80432c26e856c41338b154bd
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_smp-2.4.18-303.src.rpm
  782902cd14e7776db66bd61a12beee03
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_psmp-2.4.18-303.src.rpm
  d71fa5cda488ae18f8d023cd8f28bb73
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_i386-2.4.18-303.src.rpm
  a360a9e6ed2db54f69e17db36f02614f
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/kernel-source-2.4.18.SuSE-303.nosrc.rpm
  8017fd6ff8a6fc1a0660ab35ad174388



x86-64 Platform:

SUSE Linux 9.1:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-default-2.6.5-7.95.x86_64.rpm
  e2c53fd24991f739fd754c07f7aa8293
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-smp-2.6.5-7.95.x86_64.rpm
  f4a69622b7628cdd662a4e39aa59b60e
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-source-2.6.5-7.95.x86_64.rpm
  e71adfb1fc662600eb11d3acf67c3dc3
source rpm&#40;s&#41;:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-default-2.6.5-7.95.nosrc.rpm
  f6a364879d1f2ae2cf854810d61be3ac
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-smp-2.6.5-7.95.nosrc.rpm
  a0096d1fc067d89c9200ea3904713d59
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-source-2.6.5-7.95.src.rpm
  bf6d0439cfc37b50b4f6822c3403a74f

SUSE Linux 9.0:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_deflt-2.4.21-231.x86_64.rpm
  17e008a737e5e95e71335e34fa7f86cf
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_smp-2.4.21-231.x86_64.rpm
  ca742b550b1a503595b02cbfc9e0e481
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/kernel-source-2.4.21-231.x86_64.rpm
  8e0c16c42d1a89aa6a09be1dd575de47
source rpm&#40;s&#41;:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_deflt-2.4.21-231.src.rpm
  58b1bf42b5661119d06a04888144707a
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_smp-2.4.21-231.src.rpm
  5103001136e39fca5a59f4cbde82822b
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/kernel-source-2.4.21-231.src.rpm
  231c9e5e00f17df8cfd72d6c8a68d9cf

2) Pending vulnerabilities in SUSE Distributions and Workarounds:

- icecast
The icecast service is vulnerable to a remote denial-of-service
attack. Update packages will be available soon.

- sitecopy
The sitecopy package includes a vulnerable version of the
neon library &#40;CAN-2004-0179, CAN-2004-0398&#41;. Update packages will be
available soon.

- cadaver
The cadaver package includes a vulnerable version of the
neon library &#40;CAN-2004-0179, CAN-2004-0398&#41;. Update packages will be
available soon.

- OpenOffice_org
The OpenOffice_org package includes a vulnerable version
of the neon library &#40;CAN-2004-0179, CAN-2004-0398&#41;. Update packages
will be available soon.

- tripwire
A format string bug in tripwire can be exploited locally
to gain root permissions.
New packages are available.

- postgresql
A buffer overflow in psqlODBC could be exploited to crash the
application using it. E.g. a PHP script that uses ODBC to access a
PostgreSQL database can be utilized to crash the surrounding Apache
web-server. Other parts of PostgreSQL are not affected.
New packages are available.

- XDM/XFree86
This update resolves random listening to ports by XDM
that allows to connect via the XDMCP. SUSE LINUX 9.1
is affected only.
New packages are available.

- mod_proxy
A buffer overflow can be triggered by malicious remote
servers that return a negative Content-Length value.
This vulnerability can be used to execute commands remotely
New packages are available.

- freeswan
A bug in the certificate chain authentication code could allow an
attacker to authenticate any host against a FreeS/WAN server by
presenting specially crafted certificates wrapped in a PKCS#7 file.
The packages are currently being tested and will be available soon.

- ipsec-tools
The racoon daemon which is responsible for handling IKE messages
fails to reject invalid or self-signed X.509 certificates which
allows for man-in-the-middle attacks on IPsec tunnels established
via racoon.
The packages are currently being tested and will be available soon.

- less
This update fixes a possible symlink attack in lessopen.sh. The
attack can be executed by local users to overwrite arbitrary files
with the privileges of the user running less.
New packages are available.

- libpng
This update adds a missing fix for CAN-2002-1363.
New packages are available.

- pavuk
This update fixes a remotely exploitable buffer overflow in pavuk.
Thanks to Ulf Harnhammar for reporting this to us.
New packages are available.

- kdebase3
This update fixes a possible attack on tmp files created at the
first login of a user using KDE or at the first time running a
KDE application. This bug can be exploited locally to overwrite
arbitrary files with the privilege of the victim user.
Just affects SUSE LINUX 9.1
New packages are available.

3) standard appendix: authenticity verification, additional information

Package authenticity verification:

SUSE update packages are available on many mirror ftp servers around
the world. While this service is considered valuable and important
to the free and open source software community, many users wish to be
certain as to be the origin of the package and its content before
installing the package. There are two independent verification methods
that can be used 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 have 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
[email protected]), the checksums offer proof of the authenticity
of the package.
We recommend against subscribing 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 "[email protected]" 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:

[email protected]
- general/linux/SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an email to
<[email protected]>.

[email protected]
- SUSE's announce-only mailing list.
Only SUSE's security announcements are sent to this list.
To subscribe, send an email to
<[email protected]>.

For general information or the frequently asked questions (faq)
send mail to:
<[email protected]> or
<[email protected]> respectively.

=====================================================================
SUSE's security contact is <[email protected]> or <[email protected]>.
The <[email protected]> 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 must show 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 <[email protected]>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <[email protected]>

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| Roman Drahtmüller <[email protected]> // "You don't need eyes to see, |
SUSE Linux AG - Security Phone: // you need vision!"
| Nürnberg, Germany +49-911-740530 // Maxi Jazz, Faithless |

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