Date: Fri, 21 Jan 2005 16:11:27 +0100
From: Marcus Meissner <meissner@suse.de.>
To: [email protected]Subject: SUSE Security Announcement: kernel local privilege escalation
(SUSE-SA:2005:003)
Message-ID: <41F11B9F.mailOXD11GEML@suse.de.>
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______________________________________________________________________________
SUSE Security Announcement
Package: kernel
Announcement-ID: SUSE-SA:2005:003
Date: Friday, Jan 21st 2005 16:00 MET
Affected products: 8.1, 8.2, 9.0, 9.1, 9.2
SUSE Linux Enterprise Server 8, 9
SUSE Linux Desktop 1.0
Novell Linux Desktop 9
Vulnerability Type: local privilege escalation
Severity (1-10): 7
SUSE default package: yes
Cross References: CAN-2004-1235
CAN-2005-0001
Content of this advisory:
1) security vulnerability resolved:
- local privilege escalation
- local denial of service attacks
problem description
2) solution/workaround
3) special instructions and notes
4) package location and checksums
5) pending vulnerabilities, solutions, workarounds:
- see summary report
6) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion
Several exploitable security problems were identified and fixed in
the Linux kernel, the core of every SUSE Linux product.
- Due to missing locking in the sys_uselib system call a local attacker
can gain root access. This was found by Paul Starzetz and is tracked
by the Mitre CVE ID CAN-2004-1235.
- Paul Starzetz also found a race condition in SMP page table handling
which could lead to a local attacker gaining root access on SMP
machines. This is tracked by the Mitre CVE ID CAN-2005-0001.
- A local denial of service was found in the auditing subsystem which
have lead a local attacker crashing the machine. This was reported
and fixed by Redhat.
- The sendmsg / cmsg fix from the previous kernel update was faulty
on 64bit systems with 32bit compatibility layer and could lead to
32bit applications not working correctly on those 64bit systems.
- The smbfs security fixes from a before-previous kernel update were
faulty for some file write cases.
- A local denial of service with Direct I/O access to NFS file systems
could lead a local attacker to crash a machine with NFS mounts.
- grsecurity reported a signed integer problem in the SCSI ioctl
handling which had a missing boundary check.
Due to C language specifics, this evaluation was not correct and
there actually is no problem in this code.
The signed / unsigned mismatch was fixed nevertheless.
- Several more small non security problems were fixed.
NOTE: Two days ago we released the Service Pack 1 for the SUSE Linux
Enterprise Server 9. This kernel update contains fixes for the SUSE
Linux Enterprise Server 9 GA version kernel line.
A fix for the Service Pack 1 version line will be available shortly.
2) solution/workaround
There is no workaround. Please install the provided update packages.
3) special instructions and notes
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, 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 (root). 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 (disregard 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 chip sets
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
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 (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 the
locations below ftp://ftp.suse.com/pub/suse/i386/update/.
8.1/rpm/i586
8.2/rpm/i586
9.0/rpm/i586
9.1/rpm/i586
9.2/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
followed.
If you run SUSE LINUX 8.1 and haven't applied the kernel update
(SUSE-SA:2003:034), AND you are using 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 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 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.
4) package location and checksums
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.
x86 Platform:
SUSE Linux 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/kernel-source-2.6.8-24.11.i586.rpm
e335f4e401034f79bce9bcef3b6c19e0
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/kernel-bigsmp-2.6.8-24.11.i586.rpm
848b85f02abd3d2877b04f10aa875689
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/kernel-smp-2.6.8-24.11.i586.rpm
f103cd395e9d6e4418cb8cf91c09147d
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/kernel-default-2.6.8-24.11.i586.rpm
374dc207a2b3e81e04cdad2e3d6c0333
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/kernel-um-2.6.8-24.11.i586.rpm
379085daf7dc1e1df0ce5c246c26caf4
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/kernel-source-2.6.8-24.11.src.rpm
bbfdc289c2d1f1a73ac6fa759ecfaf87
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/kernel-bigsmp-2.6.8-24.11.nosrc.rpm
c999bd4ff601c34edc6322fc43caf1a5
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/kernel-smp-2.6.8-24.11.nosrc.rpm
9539d6093144fbbd066681f61c9aa07d
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/kernel-default-2.6.8-24.11.nosrc.rpm
eeeebf4ea4942f6093b56f7a3d7a7de3
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/kernel-um-2.6.8-24.11.nosrc.rpm
93953b908c54f19d4d30816b4eae2dc9
SUSE Linux 9.1:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-source-2.6.5-7.111.30.i586.rpm
b84574947de5c47a2bcca43525e1fc4d
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-bigsmp-2.6.5-7.111.30.i586.rpm
5346f03accd80530ef1dd870a069dc11
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-smp-2.6.5-7.111.30.i586.rpm
dba08e4e49dbf1f32988152956448ab3
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-default-2.6.5-7.111.30.i586.rpm
231eb3350db6a02b621731790f3b6d37
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-source-2.6.5-7.111.30.src.rpm
8cd984fa2f4607ff75b0ff79a82090e0
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-bigsmp-2.6.5-7.111.30.nosrc.rpm
a64279aae3382a1647f594e59ea321fe
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-smp-2.6.5-7.111.30.nosrc.rpm
653925384a7e887fb59b58a432a86968
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-default-2.6.5-7.111.30.nosrc.rpm
f01bbb3541bb8197c36757c9ac554ba9
SUSE Linux 9.0:
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/kernel-source-2.4.21-273.i586.rpm
c577564f2588a0f23b2bdf6c53622c88
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_deflt-2.4.21-273.i586.rpm
e1826b653a6dc121bc09af292469ca60
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_athlon-2.4.21-273.i586.rpm
4f6f2c3181e9ffa3665b078b56263b5f
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp-2.4.21-273.i586.rpm
93d0f1ac7d07d8965fd995755ced96d8
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp4G-2.4.21-273.i586.rpm
dc55afa79f48b332802fcf8c957f4fb1
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_um-2.4.21-273.i586.rpm
aafbe34c9623ed1558cba1334d9cefb2
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/kernel-source-2.4.21-273.src.rpm
23d2ec2beb60fe87971679ffcd7aa43b
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_deflt-2.4.21-273.src.rpm
d4570f75c0706913ab28ab591669a09f
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_athlon-2.4.21-273.src.rpm
5c9f06dab451c493ea3805c7c25b5e0e
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp-2.4.21-273.src.rpm
4f9d9932f848a81681d97b2121b95cfc
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp4G-2.4.21-273.src.rpm
595c9d12751dc3ed7911a0c839aa3798
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_um-2.4.21-273.src.rpm
3d2030e1fe01309363a62269544d4ecf
SUSE Linux 8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/kernel-source-2.4.20.SuSE-129.i586.rpm
5929f89029262db0f26f7839cae0144c
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_deflt-2.4.20-129.i586.rpm
1287e9445cf09947056f8330fad24417
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_athlon-2.4.20-129.i586.rpm
9e69c44a2d13d57388272f1991e2c549
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_smp-2.4.20-129.i586.rpm
345fdb85a6e39f15cd37cecafc8af4c5
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_psmp-2.4.20-129.i586.rpm
0964a18c464c9fd905b8c1efa2cd5ba1
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/kernel-source-2.4.20.SuSE-129.src.rpm
38e1780995f9b8463bb80d8337e9447a
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_deflt-2.4.20-129.src.rpm
449c13bd8b922c45233df240bb4b02ad
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_athlon-2.4.20-129.src.rpm
05ab0427675e9aba88460e016dbbd601
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_smp-2.4.20-129.src.rpm
86c6b0ae5616e0a72396fb19b3fbf172
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_psmp-2.4.20-129.src.rpm
eb488e7c3169936131ff6bac76862fb4
SUSE Linux 8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/kernel-source-2.4.21-273.i586.rpm
d2c2fae409431dc9380b1e230359ed56
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_deflt-2.4.21-273.i586.rpm
503e57660b3b5f6c1eadf60a54e90508
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_athlon-2.4.21-273.i586.rpm
2c5a8cb80db649a50fc64a6a37dd0230
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_smp-2.4.21-273.i586.rpm
14b2e9a7783986b9293f0561729a5216
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_psmp-2.4.21-273.i586.rpm
36930ea9a97e420b67137143bc3fbd06
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/kernel-source-2.4.21-273.src.rpm
70862f0bae01c0003b3cd48c9161c137
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_deflt-2.4.21-273.src.rpm
ef2e870d10237d85d3be66a12371cfe2
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_athlon-2.4.21-273.src.rpm
87551521c8e569351d47d9c0e097550b
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_smp-2.4.21-273.src.rpm
5062c220dd0ebe012e9f2f71137458ea
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_psmp-2.4.21-273.src.rpm
f6e881395e1d069e2dee910cdb311964
x86-64 Platform:
SUSE Linux 9.2:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/kernel-source-2.6.8-24.11.x86_64.rpm
d8d5dfd431c9b989195f94d3d3c1ea64
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/kernel-smp-2.6.8-24.11.x86_64.rpm
3a16e2109a1dbf177500430213e45b69
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/kernel-default-2.6.8-24.11.x86_64.rpm
51213878a7116455b9443688d0b39aa0
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/kernel-source-2.6.8-24.11.src.rpm
bbfdc289c2d1f1a73ac6fa759ecfaf87
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/kernel-smp-2.6.8-24.11.nosrc.rpm
9539d6093144fbbd066681f61c9aa07d
ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/kernel-default-2.6.8-24.11.nosrc.rpm
eeeebf4ea4942f6093b56f7a3d7a7de3
SUSE Linux 9.1:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-source-2.6.5-7.111.30.x86_64.rpm
44996d9e1da1df537cb1b2100553d2af
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-smp-2.6.5-7.111.30.x86_64.rpm
11ad693478569dd691d237679328bd1b
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-default-2.6.5-7.111.30.x86_64.rpm
deaeb48a6815587535b1adddf68131ef
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-source-2.6.5-7.111.30.src.rpm
fdef7eaed76e07a85ebbba9323b64f8d
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-smp-2.6.5-7.111.30.nosrc.rpm
3605a6f50f0d799c73849cb382d786ac
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-default-2.6.5-7.111.30.nosrc.rpm
d0410d0e5c32cd44bae3da7b42cac23a
SUSE Linux 9.0:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/kernel-source-2.4.21-273.x86_64.rpm
ed6c099957a83fc87abd74e3549e9799
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_deflt-2.4.21-273.x86_64.rpm
18226b51d911e09cd83657c99dd4506f
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_smp-2.4.21-273.x86_64.rpm
0489274cc30666eeec2be0127a669530
source rpm(s):
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/kernel-source-2.4.21-273.src.rpm
792149722a14f021aa095ec4fcc33976
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_deflt-2.4.21-273.src.rpm
9279c9a0613473a71057e76ab4b5a0e5
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_smp-2.4.21-273.src.rpm
3bbd006852b9b8aab8a2868d922451d5
______________________________________________________________________________
5) pending vulnerabilities in SUSE Distributions and Workarounds:
Please refer to our SUSE Security Summary report.
______________________________________________________________________________
6) 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 [email protected]),
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 "[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
<suse-security-subscribe@suse.com.>.
[email protected]
- 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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