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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel PI Futex Requeuing Bug Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1030477
SecurityTracker URL:  http://securitytracker.com/id/1030477
CVE Reference:   CVE-2014-3153   (Links to External Site)
Date:  Jun 27 2014
Impact:   Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 6.2
Description:   A vulnerability was reported in the Linux Kernel. A local user can obtain elevated privileges on the target system.

A local user can can exploit a flaw in the requeuing of Priority Inheritance (PI) to PI futexes to gain elevated privileges on the target system.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2014-0800.html

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 19 2014 Linux Kernel PI Futex Requeuing Bug Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2014:0800-01] Important: kernel security update

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

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2014:0800-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-0800.html
Issue date:        2014-06-26
CVE Names:         CVE-2014-1737 CVE-2014-1738 CVE-2014-3153 
=====================================================================

1. Summary:

Updated kernel packages that fix three security issues are now available
for Red Hat Enterprise Linux 6.2 Extended Update Support.

The Red Hat Security Response Team has rated this update as having
Important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AUS (v. 6.2 server) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.2) - x86_64

3. Description:

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

* A flaw was found in the way the Linux kernel's futex subsystem handled
the requeuing of certain Priority Inheritance (PI) futexes. A local,
unprivileged user could use this flaw to escalate their privileges on the
system. (CVE-2014-3153, Important)

* A flaw was found in the way the Linux kernel's floppy driver handled user
space provided data in certain error code paths while processing FDRAWCMD
IOCTL commands. A local user with write access to /dev/fdX could use this
flaw to free (using the kfree() function) arbitrary kernel memory.
(CVE-2014-1737, Important)

* It was found that the Linux kernel's floppy driver leaked internal kernel
memory addresses to user space during the processing of the FDRAWCMD IOCTL
command. A local user with write access to /dev/fdX could use this flaw to
obtain information about the kernel heap arrangement. (CVE-2014-1738, Low)

Note: A local user with write access to /dev/fdX could use these two flaws
(CVE-2014-1737 in combination with CVE-2014-1738) to escalate their
privileges on the system.

Red Hat would like to thank Kees Cook of Google for reporting
CVE-2014-3153, and Matthew Daley for reporting CVE-2014-1737 and
CVE-2014-1738. Google acknowledges Pinkie Pie as the original reporter of
CVE-2014-3153.

All kernel users are advised to 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/site/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 (https://bugzilla.redhat.com/):

1094299 - CVE-2014-1737 CVE-2014-1738 kernel: block: floppy: privilege escalation via FDRAWCMD floppy ioctl command
1103626 - CVE-2014-3153 kernel: futex: pi futexes requeue issue

6. Package List:

Red Hat Enterprise Linux AUS (v. 6.2 server):

Source:
kernel-2.6.32-220.52.1.el6.src.rpm

noarch:
kernel-doc-2.6.32-220.52.1.el6.noarch.rpm
kernel-firmware-2.6.32-220.52.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-220.52.1.el6.x86_64.rpm
kernel-debug-2.6.32-220.52.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-220.52.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-220.52.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.52.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.52.1.el6.x86_64.rpm
kernel-devel-2.6.32-220.52.1.el6.x86_64.rpm
kernel-headers-2.6.32-220.52.1.el6.x86_64.rpm
perf-2.6.32-220.52.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.52.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.52.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.2):

Source:
kernel-2.6.32-220.52.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-220.52.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.52.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.52.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.52.1.el6.x86_64.rpm
python-perf-2.6.32-220.52.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.52.1.el6.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-2014-1737.html
https://www.redhat.com/security/data/cve/CVE-2014-1738.html
https://www.redhat.com/security/data/cve/CVE-2014-3153.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 2014 Red Hat, Inc.
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