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______________________________________________________________________________

SUSE Security Announcement

Package: kernel
Announcement ID: SUSE-SA:2006:064
Date: Fri, 10 Nov 2006 10:00:00 +0000
Affected Products: SuSE Linux Desktop 1.0
SuSE Linux Enterprise Server 8
SuSE Linux Openexchange Server 4
SUSE LINUX Retail Solution 8
SuSE Linux School Server
SuSE Linux Standard Server 8
UnitedLinux 1.0
Vulnerability Type: local privilege escalation
Severity (1-10): 6
SUSE Default Package: yes
Cross-References: CVE-2006-2444, CVE-2006-2935, CVE-2006-3468

Content of This Advisory:
1) Security Vulnerability Resolved:
various Linux 2.4 kernel security problems
Problem Description
2) Solution or Work-Around
3) Special Instructions and Notes
4) Package Location and Checksums
5) Pending Vulnerabilities, Solutions, and Work-Arounds:
none
6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

The Linux kernel in our old Linux 2.4 kernel based distributions have
been updated to fix various security issues and bugs.

The bugs tracked by CVE-2006-3468, CVE-2006-2935, and CVE-2006-2444 were
already fixed for all other products and announced in SUSE-SA:2006:057
and SUSE-SA:2006:047 respectively.

- CVE-2006-3468: Remote attackers able to access an NFS of a ext2 or
ext3 filesystem can cause a denial of service (file
system panic) via a crafted UDP packet with a V2
look-up procedure that specifies a bad file handle
(inode number), which triggers an error and causes
an exported directory to be remounted read-only.
This requires attackers with local network access.

- CVE-2006-2935: A stack based buffer overflow in CDROM / DVD
handling was fixed which could be used by a physical
local attacker to crash the kernel or execute code
within kernel context, depending on presence of
automatic DVD handling in the system. By default
our systems do not have automatic DVD handling.

- CVE-2006-2444: The snmp_trap_decode function in the SNMP NAT helper
allows remote attackers to cause a denial of
service (crash) via unspecified remote attack
vectors that cause failures in snmp_trap_decode
that trigger (1) frees of random memory or (2)
frees of previously-freed memory (double-free) by
snmp_trap_decode as well as its calling function,
as demonstrated via certain test cases of the PROTOS
SNMP test suite.

Also the following non-security bugs were fixed:
- If the IPX network protocol was active, it was theoretically possible
to remotely crash the machine by special crafted IPX network packets.
The Linux kernel developers consider this problem not exploitable,
so no CVE was assigned.
- Fix dumps with DUMP_LEVEL=2.
- Fixed some server crashes with "__alloc_pages: 1-order allocation failed
(gfp=0x1f0/0)" errors.

Fixes for the S/390:
- This update contains the following Code Drops from Developerworks:

Patchcluster 36
- Problem-ID: 26014 qeth: stack trace with msg "inconsistent lock state"
- Problem-ID: 27706 kernel: user readable uninitialized kernel memory.

For further description of the named Problem-IDs, please look to
http://www-128.ibm.com/developerworks/linux/linux390/june2003_recommended.html

2) Solution or Work-Around

There is no known workaround, please install the update packages.

3) Special Instructions and Notes

None.

4) Package Location and Checksums

The preferred method for installing security updates is to use the YaST
Online Update (YOU) tool. YOU detects which updates are required and
automatically performs the necessary steps to verify and install them.
Alternatively, download the update packages for your distribution manually
and verify their integrity by the methods listed in Section 6 of this
announcement. Then install the packages using the command

rpm -Fhv <file.rpm>

to apply the update, replacing <file.rpm> with the filename of the
downloaded RPM package.

Our maintenance customers are notified individually. The packages are
offered for installation from the maintenance web:

SuSE Linux Enterprise Server 8 for IBM zSeries
http://support.novell.com/techcenter/psdb/aabad90e230984722c9884260efe69ee.html

SuSE Linux Enterprise Server 8 for IBM S/390 and IBM zSeries
http://support.novell.com/techcenter/psdb/d90b894a706940fd53a7fb1d73dfc9d4.html

SuSE Linux Enterprise Server 8 for IBM iSeries and IBM pSeries
http://support.novell.com/techcenter/psdb/ab257334465861fd968252a7b2bc1f3d.html

SuSE Linux Enterprise Server 8 for IPF
http://support.novell.com/techcenter/psdb/85e547a01d9aab2432eaa26b0163cda9.html

SuSE Linux Enterprise Server 8 for AMD64
http://support.novell.com/techcenter/psdb/953fbe496665b510e79cafb4d6f28837.html

SuSE Linux Desktop 1.0
http://support.novell.com/techcenter/psdb/7464b65661cf57554b4ee821ea0bbf40.html

UnitedLinux 1.0
http://support.novell.com/techcenter/psdb/85e547a01d9aab2432eaa26b0163cda9.html
http://support.novell.com/techcenter/psdb/953fbe496665b510e79cafb4d6f28837.html
http://support.novell.com/techcenter/psdb/09c539304999e790397997e9b73bc166.html

SuSE Linux Openexchange Server 4
http://support.novell.com/techcenter/psdb/09c539304999e790397997e9b73bc166.html

SuSE Linux Enterprise Server 8
http://support.novell.com/techcenter/psdb/aabad90e230984722c9884260efe69ee.html
http://support.novell.com/techcenter/psdb/d90b894a706940fd53a7fb1d73dfc9d4.html
http://support.novell.com/techcenter/psdb/ab257334465861fd968252a7b2bc1f3d.html
http://support.novell.com/techcenter/psdb/85e547a01d9aab2432eaa26b0163cda9.html
http://support.novell.com/techcenter/psdb/953fbe496665b510e79cafb4d6f28837.html
http://support.novell.com/techcenter/psdb/09c539304999e790397997e9b73bc166.html

SuSE Linux Standard Server 8
http://support.novell.com/techcenter/psdb/09c539304999e790397997e9b73bc166.html

SuSE Linux School Server
http://support.novell.com/techcenter/psdb/09c539304999e790397997e9b73bc166.html

SUSE LINUX Retail Solution 8
http://support.novell.com/techcenter/psdb/09c539304999e790397997e9b73bc166.html

______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

none
______________________________________________________________________________

6) Authenticity Verification and Additional Information

- Announcement authenticity verification:

SUSE security announcements are published via mailing lists and on Web
sites. The authenticity and integrity of a SUSE security announcement is
guaranteed by a cryptographic signature in each announcement. All SUSE
security announcements are published with a valid signature.

To verify the signature of the announcement, save it as text into a file
and run the command

gpg --verify <file>

replacing <file> with the name of the file where you saved the
announcement. The output for a valid signature looks like:

gpg: Signature made <DATE> using RSA key ID 3D25D3D9
gpg: Good signature from "SuSE Security Team <security@suse.de>"

where <DATE> is replaced by the date the document was signed.

If the security team's key is not contained in your key ring, you can
import it from the first installation CD. To import the key, use the
command

gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

- Package authenticity verification:

SUSE update packages are available on many mirror FTP servers all over the
world. While this service is considered valuable and important to the free
and open source software community, the authenticity and the integrity of
a package needs to be verified to ensure that it has not been tampered
with.

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) Using the internal gpg signatures of the rpm package
2) MD5 checksums as provided in this announcement

1) The internal 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, replacing <file.rpm> with the
filename of the RPM package downloaded. The package is unmodified if it
contains a valid signature from build@suse.de with the key ID 9C800ACA.

This key is automatically imported into the RPM database (on
RPMv4-based distributions) and the gpg key ring of 'root' during
installation. You can also find it on the first installation CD and at
the end of this announcement.

2) If you need an alternative means of verification, use the md5sum
command to verify the authenticity of the packages. Execute the command

md5sum <filename.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
SUSE security announcement. Because the announcement containing the
checksums is cryptographically signed (by security@suse.de), the
checksums show proof of the authenticity of the package if the
signature of the announcement is valid. Note that the md5 sums
published in the SUSE Security Announcements are valid for the
respective packages only. Newer versions of these packages cannot be
verified.

- SUSE runs two security mailing lists to which any interested party may
subscribe:

suse-security@suse.com
- General Linux and SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an e-mail 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 e-mail 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>.

=====================================================================
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, the
clear text signature should show proof of the authenticity of the text.

SUSE Linux Products GmbH provides 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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