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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
SecurityTracker Alert ID:  1037134
SecurityTracker URL:  http://securitytracker.com/id/1037134
CVE Reference:   CVE-2016-5195   (Links to External Site)
Date:  Oct 27 2016
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 6.5
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain root privileges on the target system.

A local user can a race condition in the kernel memory subsystem in the management of copy-on-write operations on read-only memory mappings to overwrite kernel memory and gain kernel-level privileges.

This vulnerability is being actively exploited.

Some demonstration exploit code is listed at:

https://github.com/dirtycow/dirtycow.github.io/wiki/PoCs

Impact:   A local user can obtain root 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-2016-2120.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-2120.html (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Oct 22 2016 Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2016:2120-01] Important: kernel security update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2016:2120-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-2120.html
Issue date:        2016-10-27
CVE Names:         CVE-2016-5195 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.5
Advanced Update Support and Red Hat Enterprise Linux 6.5 Telco Extended
Update Support.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server AUS (v. 6.5) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.5) - x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 6.5) - x86_64
Red Hat Enterprise Linux Server TUS (v. 6.5) - noarch, x86_64

3. Description:

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

Security Fix(es):

* A race condition was found in the way the Linux kernel's memory subsystem
handled the copy-on-write (COW) breakage of private read-only memory
mappings. An unprivileged, local user could use this flaw to gain write
access to otherwise read-only memory mappings and thus increase their
privileges on the system. (CVE-2016-5195, Important)

Red Hat would like to thank Phil Oester for reporting this issue.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

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

1384344 - CVE-2016-5195 kernel: mm: privilege escalation via MAP_PRIVATE COW breakage

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 6.5):

Source:
kernel-2.6.32-431.75.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-431.75.1.el6.noarch.rpm
kernel-doc-2.6.32-431.75.1.el6.noarch.rpm
kernel-firmware-2.6.32-431.75.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debug-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.75.1.el6.x86_64.rpm
kernel-devel-2.6.32-431.75.1.el6.x86_64.rpm
kernel-headers-2.6.32-431.75.1.el6.x86_64.rpm
perf-2.6.32-431.75.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server TUS (v. 6.5):

Source:
kernel-2.6.32-431.75.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-431.75.1.el6.noarch.rpm
kernel-doc-2.6.32-431.75.1.el6.noarch.rpm
kernel-firmware-2.6.32-431.75.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debug-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.75.1.el6.x86_64.rpm
kernel-devel-2.6.32-431.75.1.el6.x86_64.rpm
kernel-headers-2.6.32-431.75.1.el6.x86_64.rpm
perf-2.6.32-431.75.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.5):

Source:
kernel-2.6.32-431.75.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.75.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
python-perf-2.6.32-431.75.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 6.5):

Source:
kernel-2.6.32-431.75.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.75.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.75.1.el6.x86_64.rpm
python-perf-2.6.32-431.75.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.75.1.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/

7. References:

https://access.redhat.com/security/cve/CVE-2016-5195
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/2706661

8. Contact:

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

Copyright 2016 Red Hat, Inc.
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