SUSE Security Announcement: Linux Kernel (SuSE-SA:2004:001)
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______________________________________________________________________________
SUSE Security Announcement
Package: Linux Kernel
Announcement-ID: SuSE-SA:2004:001
Date: Monday, Jan 5th 2004 20:27 MET
Affected products: 8.0, 8.1, 8.2, 9.0
SuSE Linux Enterprise Server 7,
SuSE Linux Database Server,
SuSE eMail Server III, 3.1
SuSE Linux Firewall on CD/Admin host
SuSE Linux Office Server
SuSE Linux Desktop 1.0
SuSE Linux School Server
Vulnerability Type: local system compromise
Severity (1-10): 6
SUSE default package: yes
Cross References:
Content of this advisory:
1) security vulnerability resolved:
- incorrect bounds checking
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- mc
- mod_gzip
- tripwire
- cvs
- irssi
- atftp
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
The do_mremap() function of the Linux Kernel is used to manage
(move, resize) Virtual Memory Areas (VMAs). By exploiting an incorrect
bounds check in do_mremap() during the remapping of memory it is
possible to create a VMA with the size of 0.
In normal operation do_mremap() leaves a memory hole of one page and
creates an additional VMA of two pages. In case of exploitation no
hole is created but the new VMA has a 0 bytes length.
The Linux Kernel's memory management is corrupted from this point
and can be abused by local users to gain root privileges.
There is no temporary workaround for this bug.
Please note that on 8.1, the kernel-source package may not be
installable through rpm, because of a bug in RPM (update of
the kernel source RPM may take 30 minutes or more, or fail
entirely). Owing to this problem, the kernel source is not
available as a regular YOU update.
However, recognizing our obligation to publish the source along
with the binary packages, we are making the source available as
a compressed tar archive, downloadable from the normal FTP
locations
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)
k_smp4G # kernel for SMP systems which supports a maximum of 4G of RAM
**** 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 below ftp://ftp.suse.com/pub/suse/i386/update/.
8.0/images/
8.1/rpm/i586
8.2/rpm/i586
9.0/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 haven't applied the previous
kernel update (SUSE-SA:2003:034), 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 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 (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 ramdisk (initrd) for your system.
On SuSE Linux 8.1 and later, this is done automatically when the
RPM is installed.
**** 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.
Our maintenance customers are being notified individually. The packages
are being offered to install from the maintenance web.
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.
Missing packages will be published later.
Intel i386 Platform:
SuSE-9.0:
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_athlon-2.4.21-166.i586.rpm
0bbda4a9166edcdd4444fa43a5b37f10
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_athlon-2.4.21-166.src.rpm
3cce21862c2d54a82742c74557dcc7fa
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_deflt-2.4.21-166.i586.rpm
6df247b9f114e8636de2c673747ef6ea
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_deflt-2.4.21-166.src.rpm
c06a81d1e7912db429df25e8e8d754b7
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp-2.4.21-166.i586.rpm
0da9470eb573ecb5c801bedbd5dbf666
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp-2.4.21-166.src.rpm
34393ea6b46a8b8859d51020e1dc275e
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp4G-2.4.21-166.i586.rpm
0b0d23a4a6918e57a1e7c45504a50df7
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp4G-2.4.21-166.src.rpm
26cadc4c9d77dc6e433bedc458166236
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_um-2.4.21-166.i586.rpm
7e18d9b0b89ef72bee40bbf150dd0470
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_um-2.4.21-166.src.rpm
ad8c357792c0d34570c9ba54a579d867
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/kernel-source-2.4.21-166.i586.rpm
48b46c943cc15aacfba0ec68090de1f6
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/kernel-source-2.4.21-166.src.rpm
ef71c55f61b595edc24be7c318237432
SuSE-8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_athlon-2.4.20-102.i586.rpm
61de636fab3149ee5d45d16dccf8d0e8
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_athlon-2.4.20-102.src.rpm
80b8f44b6f8f4d039b8954c709b457b0
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_deflt-2.4.20-102.i586.rpm
c25b57bc5d67d87177abf7953f022331
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_deflt-2.4.20-102.src.rpm
29d014e79a3ee0b14a23cb0e4bdd0f0e
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_smp-2.4.20-102.i586.rpm
d42041b08cdee2d9959a4a6dad8b6e9d
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_smp-2.4.20-102.src.rpm
22e598ebf546cd9378c852042b602f2f
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_psmp-2.4.20-102.i586.rpm
c2e0455b45eac55c97e13322ab40e4bc
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_psmp-2.4.20-102.src.rpm
68b2d35ae0de009ac3fbc6ee9a0bb3fd
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/kernel-source-2.4.20.SuSE-102.i586.rpm
0f539af39523fd27232289014db36202
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/kernel-source-2.4.20.SuSE-102.src.rpm
14c238bbbd7758abc2b4113a7297f2b5
SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_athlon-2.4.21-168.i586.rpm
8299b1153d3d9d81236e4e77f3ae66e2
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_athlon-2.4.21-168.src.rpm
0705e6bb739aaec77bc9801760e60051
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_deflt-2.4.21-168.i586.rpm
fea1ffe95acdbc5c00d3272b3867bd39
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_deflt-2.4.21-168.src.rpm
aeff9339c71c275fd3c7e9ebcf49cc4f
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_smp-2.4.21-168.i586.rpm
f4e41bdd0806673d82dc0971e36da0e1
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_smp-2.4.21-168.src.rpm
f352afbf4c6d679fd4bf40347bd7989c
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_debug-2.4.21-168.i586.rpm
81e9a2516e7b9a8d0234f2d6ee9e4444
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_debug-2.4.21-168.src.rpm
8b6c8e51c93c9dcbf5d34587de722a4a
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_psmp-2.4.21-168.i586.rpm
9961f14d44c40a83be800ad463e17e51
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_psmp-2.4.21-168.src.rpm
f3caa2e715d24a2987408e29e0623737
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_deflt-2.4.18-282.i386.rpm
62ae55de1c6abbe821b99165cbccdce7
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_deflt-2.4.18-282.src.rpm
c65eadb1dd7225463f7a29979ab43dd8
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_smp-2.4.18-282.i386.rpm
7fdec3995171a6d88f293c10c41e6991
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_smp-2.4.18-282.src.rpm
08a2cba4382f4bb8adfc5cb8f80677d1
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_psmp-2.4.18-282.i386.rpm
955386318df968aac6c66b6071eb466a
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_psmp-2.4.18-282.src.rpm
fe87f59c3e818fbb9eedcb211f9d0bf4
ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/kernel-source-2.4.18.SuSE-282.i386.rpm
249a3cd1dcc1edaabf00d72874ba4aa2
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/kernel-source-2.4.18.SuSE-282.nosrc.rpm
7e5cbc3af87fdedbd8b6dc829e038d63
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_i386-2.4.18-282.i386.rpm
bd80346beef2e459009584065fccc7eb
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_i386-2.4.18-282.src.rpm
ce704a3481d8b84f9fdd0b83784e74a6
Opteron x86_64 Platform:
SuSE-9.0:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_deflt-2.4.21-171.x86_64.rpm
3dd54a4105bad6c4f3084e70aaa45410
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_deflt-2.4.21-171.src.rpm
d88ca0142409a98a7e4e9f4f7b2e9bf8
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_smp-2.4.21-171.x86_64.rpm
b97e9d91ef710b0b801536294d99ba1a
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_smp-2.4.21-171.src.rpm
6221b0f5893499f5926c9dd529fceb5c
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/kernel-source-2.4.21-171.x86_64.rpm
1a27668dff4ae3c405f18399432a326e
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/kernel-source-2.4.21-171.src.rpm
301e1d8ac232d3a000f373a928deee5f
______________________________________________________________________________
2) Pending vulnerabilities in SUSE Distributions and Workarounds:
- 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 release as soon.
- mod_gzip
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.
- 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.
New packages will be available soon.
- irssi
Under special circumstances the the irc-client irssi can be crashed
remotely by other irc-clients.
New packages are available on our FTP servers.
- atftp
A buffer overflow vulnerability discovered by Rick Patel has been
fixed in the atftpd (trivial file transfer protocol, UDP oriented)
daemon, contained in the atftp package. Update packages for the
affected SUSE Linux distributions 8.1 and 8.2 have been published on
our ftp server today.
We explicitly thank Dirk Mueller, KDE developer, for notifying SUSE
Security about the pending treatment of this incident.
New packages are available on our FTP servers.
______________________________________________________________________________
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@xxxxxxx),
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@xxxxxxx" 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@xxxxxxxx
- general/linux/SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an email to
<suse-security-subscribe@xxxxxxxx>.
suse-security-announce@xxxxxxxx
- 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@xxxxxxxx>.
For general information or the frequently asked questions (faq)
send mail to:
<suse-security-info@xxxxxxxx> or
<suse-security-faq@xxxxxxxx> respectively.
=====================================================================
SUSE's security contact is <security@xxxxxxxx> or <security@xxxxxxx>.
The <security@xxxxxxx> 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@xxxxxxx>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@xxxxxxx>
- -----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org
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