-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0683
               Important: kernel security and bug fix update
                               18 July 2012

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 5
Impact/Access:     Increased Privileges -- Existing Account
                   Denial of Service    -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-2136  

Reference:         ESB-2012.0562
                   ESB-2012.0501

Original Bulletin: 
   https://rhn.redhat.com/errata/RHSA-2012-1087.html

Comment: Note: Unprivileged users cannot access TUN/TAP devices until the root 
         user grants them access.

- --------------------------BEGIN INCLUDED TEXT--------------------

- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2012:1087-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1087.html
Issue date:        2012-07-17
CVE Names:         CVE-2012-2136 
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue and multiple bugs are
now available for Red Hat Enterprise Linux 5.6 Extended Update Support.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux EUS (v. 5.6 server) - i386, ia64, noarch, ppc, s390x, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issue:

* It was found that the data_len parameter of the sock_alloc_send_pskb()
function in the Linux kernel's networking implementation was not validated
before use. A local user with access to a TUN/TAP virtual interface could
use this flaw to crash the system or, potentially, escalate their
privileges. Note that unprivileged users cannot access TUN/TAP devices
until the root user grants them access. (CVE-2012-2136, Important)

This update also fixes the following bugs:

* An insufficiently designed calculation in the CPU accelerator in the
previous kernel caused an arithmetic overflow in the sched_clock() function
when system uptime exceeded 208.5 days. This overflow led to a kernel panic
on the systems using the Time Stamp Counter (TSC) or Virtual Machine
Interface (VMI) clock source. This update corrects the described
calculation so that this arithmetic overflow and kernel panic can no longer
occur under these circumstances. (BZ#825981, BZ#835449)

* Previously, a race condition between the journal_write_metadata_buffer()
and jbd_unlock_bh_state() functions could occur. Consequently, another
thread could call the get_write_access() function on the buffer head and
cause the wrong data to be written into the journal. If the system
terminated unexpectedly or was shut down incorrectly, subsequent file
system journal replay could result in file system corruption. This update
fixes the race condition and the file system corruption no longer occurs in
the described scenario. (BZ#833764)

* When the kvmclock initialization was used in a guest, it could write to
the Time Stamp Counter (TSC) and, under certain circumstances, could cause
the kernel to become unresponsive on boot. With this update, TSC
synchronization, which is unnecessary due to kvmclock, has been disabled,
thus fixing this bug. (BZ#834557)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

To install kernel packages manually, use "rpm -ivh [package]". Do not
use "rpm -Uvh" as that will remove the running kernel binaries from
your system. You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.

5. Bugs fixed (http://bugzilla.redhat.com/):

816289 - CVE-2012-2136 kernel: net: insufficient data_len validation in sock_alloc_send_pskb()

6. Package List:

Red Hat Enterprise Linux EUS (v. 5.6 server):

Source:
kernel-2.6.18-238.40.1.el5.src.rpm

i386:
kernel-2.6.18-238.40.1.el5.i686.rpm
kernel-PAE-2.6.18-238.40.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-238.40.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-238.40.1.el5.i686.rpm
kernel-debug-2.6.18-238.40.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-238.40.1.el5.i686.rpm
kernel-debug-devel-2.6.18-238.40.1.el5.i686.rpm
kernel-debuginfo-2.6.18-238.40.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-238.40.1.el5.i686.rpm
kernel-devel-2.6.18-238.40.1.el5.i686.rpm
kernel-headers-2.6.18-238.40.1.el5.i386.rpm
kernel-xen-2.6.18-238.40.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-238.40.1.el5.i686.rpm
kernel-xen-devel-2.6.18-238.40.1.el5.i686.rpm

ia64:
kernel-2.6.18-238.40.1.el5.ia64.rpm
kernel-debug-2.6.18-238.40.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-238.40.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-238.40.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-238.40.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-238.40.1.el5.ia64.rpm
kernel-devel-2.6.18-238.40.1.el5.ia64.rpm
kernel-headers-2.6.18-238.40.1.el5.ia64.rpm
kernel-xen-2.6.18-238.40.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-238.40.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-238.40.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-238.40.1.el5.noarch.rpm

ppc:
kernel-2.6.18-238.40.1.el5.ppc64.rpm
kernel-debug-2.6.18-238.40.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-238.40.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-238.40.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-238.40.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-238.40.1.el5.ppc64.rpm
kernel-devel-2.6.18-238.40.1.el5.ppc64.rpm
kernel-headers-2.6.18-238.40.1.el5.ppc.rpm
kernel-headers-2.6.18-238.40.1.el5.ppc64.rpm
kernel-kdump-2.6.18-238.40.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-238.40.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-238.40.1.el5.ppc64.rpm

s390x:
kernel-2.6.18-238.40.1.el5.s390x.rpm
kernel-debug-2.6.18-238.40.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-238.40.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-238.40.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-238.40.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-238.40.1.el5.s390x.rpm
kernel-devel-2.6.18-238.40.1.el5.s390x.rpm
kernel-headers-2.6.18-238.40.1.el5.s390x.rpm
kernel-kdump-2.6.18-238.40.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-238.40.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-238.40.1.el5.s390x.rpm

x86_64:
kernel-2.6.18-238.40.1.el5.x86_64.rpm
kernel-debug-2.6.18-238.40.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-238.40.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-238.40.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-238.40.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-238.40.1.el5.x86_64.rpm
kernel-devel-2.6.18-238.40.1.el5.x86_64.rpm
kernel-headers-2.6.18-238.40.1.el5.x86_64.rpm
kernel-xen-2.6.18-238.40.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-238.40.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-238.40.1.el5.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-2136.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.4 (GNU/Linux)

iD8DBQFQBb0QXlSAg2UNWIIRAq4XAJ9y1hbIeSgsIZ9Eb1CmobsTaFfG0wCguO40
0Al/6v77xyPQOCKAmeWkFaw=
=97g3
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=e9sC
-----END PGP SIGNATURE-----