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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0083
                   Important: kernel-rt security update
                              25 January 2012

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

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

Product:          Red Hat Enterprise MRG
Publisher:        Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Impact/Access:    Root Compromise -- Existing Account
Resolution:       Patch/Upgrade
CVE Names:        CVE-2012-0056  

Reference:        ESB-2012.0079

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                   Red Hat Security Advisory

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2012:0061-01
Product:           Red Hat Enterprise MRG for RHEL-6
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-0061.html
Issue date:        2012-01-24
CVE Names:         CVE-2012-0056 
=====================================================================

1. Summary:

Updated kernel-rt packages that fix one security issue are now available
for Red Hat Enterprise MRG 2.1.

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:

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

3. Description:

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

This update fixes the following security issue:

* It was found that permissions were not checked properly in the Linux
kernel when handling the /proc/[pid]/mem writing functionality. A local,
unprivileged user could use this flaw to escalate their privileges. Refer
to Red Hat Knowledgebase article DOC-69129, linked to in the References,
for further information. (CVE-2012-0056, Important)

Red Hat would like to thank Jüri Aedla for reporting this issue.

Users should upgrade to these updated packages, which correct this issue.
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/kb/docs/DOC-11259

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/):

782642 - CVE-2012-0056 kernel: proc: /proc/<pid>/mem mem_write insufficient permission checking

6. Package List:

MRG Realtime for RHEL 6 Server v.2:

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/RHEMRG-RHEL6/SRPMS/kernel-rt-3.0.9-rt26.46.el6rt.src.rpm

noarch:
kernel-rt-doc-3.0.9-rt26.46.el6rt.noarch.rpm
kernel-rt-firmware-3.0.9-rt26.46.el6rt.noarch.rpm

x86_64:
kernel-rt-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-debug-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-devel-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-trace-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-vanilla-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.0.9-rt26.46.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.0.9-rt26.46.el6rt.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-2012-0056.html
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/kb/docs/DOC-69129

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.
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