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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel Flaw in PPP over L2TP Sockets Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1030689
SecurityTracker URL:  http://securitytracker.com/id/1030689
CVE Reference:   CVE-2014-4943   (Links to External Site)
Date:  Aug 7 2014
Impact:   Root 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.

On systems with CONFIG_PPPOL2TP enabled, a local user can exploit a flaw in the pppol2tp_setsockopt() and pppol2tp_getsockopt() functions to gain kernel-level privileges.

Sasha Levin reported this vulnerability.

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-2014-1025.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.
Jul 19 2014 Linux Kernel Flaw in PPP over L2TP Sockets Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2014:1025-01] Important: kernel security and bug fix update

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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2014:1025-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-1025.html
Issue date:        2014-08-06
CVE Names:         CVE-2014-4943 
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue and one bug are now
available for Red Hat Enterprise Linux 6.2 Advanced 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 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 pppol2tp_setsockopt() and
pppol2tp_getsockopt() functions in the Linux kernel's PPP over L2TP
implementation handled requests with a non-SOL_PPPOL2TP socket option
level. A local, unprivileged user could use this flaw to escalate their
privileges on the system. (CVE-2014-4943, Important)

Red Hat would like to thank Sasha Levin for reporting this issue.

This update also fixes the following bug:

* When a device was registered to a bus, a race condition could occur
between the device being added to the list of devices of the bus and
binding the device to a driver. As a result, the device could already be
bound to a driver which led to a warning and incorrect reference counting,
and consequently to a kernel panic on device removal. To avoid the race
condition, this update adds a check to identify an already bound device.
(BZ#1114409)

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/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/):

1119458 - CVE-2014-4943 kernel: net: pppol2tp: level handling in pppol2tp_[s,g]etsockopt()

6. Package List:

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

Source:
kernel-2.6.32-220.54.1.el6.src.rpm

noarch:
kernel-doc-2.6.32-220.54.1.el6.noarch.rpm
kernel-firmware-2.6.32-220.54.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-220.54.1.el6.x86_64.rpm
kernel-debug-2.6.32-220.54.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-220.54.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-220.54.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.54.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.54.1.el6.x86_64.rpm
kernel-devel-2.6.32-220.54.1.el6.x86_64.rpm
kernel-headers-2.6.32-220.54.1.el6.x86_64.rpm
perf-2.6.32-220.54.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.54.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.54.1.el6.x86_64.rpm

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

Source:
kernel-2.6.32-220.54.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-220.54.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.54.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.54.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.54.1.el6.x86_64.rpm
python-perf-2.6.32-220.54.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.54.1.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-2014-4943.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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