SUSE Security Announcement: Linux kernel (SUSE-SA:2007:043)

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SUSE Security Announcement

Package: kernel
Announcement ID: SUSE-SA:2007:043
Date: Mon, 09 Jul 2007 13:00:00 +0000
Affected Products: SUSE LINUX 10.0
openSUSE 10.2
SUSE SLES 9
Novell Linux Desktop 9
Enterprise Server
Novell Linux PS 9
Vulnerability Type: remote denial of service
Severity (1-10): 7
SUSE Default Package: yes
Cross-References: CVE-2006-7203, CVE-2007-1357, CVE-2007-1496
CVE-2007-1497, CVE-2007-1592, CVE-2007-1861
CVE-2007-2453, CVE-2007-2876

Content of This Advisory:
1) Security Vulnerability Resolved:
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:
See SUSE Security Summary Report.
6) Authenticity Verification and Additional Information



1) Problem Description and Brief Discussion

The SUSE Linux 10.0 and openSUSE 10.2 have been updated to fix various
security problems.

Please note that the SUSE Linux 10.0 has been released some weeks ago.

The SUSE Linux 10.1 is affected by some of those problems but will
be updated in some weeks to merge back with the SLE10 Service Pack
1 kernel.

- CVE-2007-1357: A denial of service problem against the AppleTalk
protocol was fixed. A remote attacker in the same AppleTalk
network segment could cause the machine to crash if it has AppleTalk
protocol loaded.

- CVE-2007-1861: The nl_fib_lookup function in net/ipv4/fib_frontend.c
allows attackers to cause a denial of service (kernel panic) via
NETLINK_FIB_LKUP replies, which trigger infinite recursion and
a stack overflow.

- CVE-2007-1496: nfnetlink_log in netfilter allows attackers to cause
a denial of service (crash) via unspecified vectors involving the
(1) nfulnl_recv_config function, (2) using "multiple packets per
netlink message", and (3) bridged packets, which trigger a NULL
pointer dereference.

- CVE-2007-1497: nf_conntrack in netfilter does not set nfctinfo
during reassembly of fragmented packets, which leaves the default
value as IP_CT_ESTABLISHED and might allow remote attackers to
bypass certain rulesets using IPv6 fragments.

Please note that the connection tracking option for IPv6 is not
enabled in any currently shipping SUSE Linux kernel, so it does
not affect SUSE Linux default kernels.

- CVE-2007-1592: A local user could affect a double-free of a ipv6
structure potentially causing a local denial of service attack.

- CVE-2006-7203: The compat_sys_mount function in fs/compat.c allows
local users to cause a denial of service (NULL pointer dereference
and oops) by mounting a smbfs file system in compatibility mode
("mount -t smbfs").

- CVE-2007-2453: Seeding of the kernel random generator on boot did
not work correctly due to a programming mistake and so the kernel
might have more predictable random numbers than assured.

- CVE-2007-2876: A NULL pointer dereference in SCTP connection
tracking could be caused by a remote attacker by sending specially
crafted packets.

Note that this requires SCTP set-up and active to be exploitable.

Also some non-security bugs were fixed.

2) Solution or Work-Around

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

3) Special Instructions and Notes

Please reboot the machine after update.

openSUSE 10.2 this update will trigger installation of new NVIDIA
kernel drivers if you have the NVIDIA repository added.

This addition will leave the old versions present, they need to be
removed manually.

Run:
rpm -qa |grep nvidia-gfx

If you have a new "nvidia-gfxG01-" package in this list, you can
remove the left over nvidia-gfx- package.

4) Package Location and Checksums

The preferred method for installing security updates is to use the YaST
Update (YU) tool. YU 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.rpmwith the filename of the
downloaded RPM package.


x86 Platform:

openSUSE 10.2:













SUSE LINUX 10.0:





























Power PC Platform:

openSUSE 10.2:











SUSE LINUX 10.0:











x86-64 Platform:

openSUSE 10.2:









SUSE LINUX 10.0:

















Sources:

openSUSE 10.2:

















SUSE LINUX 10.0:

























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

See SUSE Security Summary Report.


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 <file>

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

gpg: Signature made <DATEusing RSA key ID 3D25D3D9
gpg: Good signature from "SuSE Security Team <security (AT) suse (DOT) de>"

where <DATEis 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

- 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 <file.rpm>

to verify the signature of the package, replacing <file.rpmwith the
filename of the RPM package downloaded. The package is unmodified if it
contains a valid signature from build (AT) suse (DOT) 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 (AT) suse (DOT) 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:

opensuse-security (AT) opensuse (DOT) org
- General Linux and SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an e-mail to
<opensuse-security+subscribe (AT) opensuse (DOT) org>.

opensuse-security-announce (AT) opensuse (DOT) org
- SUSE's announce-only mailing list.
SUSE's security announcements are sent to this list.
To subscribe, send an e-mail to
<@opensuse.org>.


SUSE's security contact is <security (AT) suse (DOT) comor <security (AT) suse (DOT) de>.
The <security (AT) suse (DOT) depublic 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 (AT) suse (DOT) de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build (AT) suse (DOT) de>

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