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Red Hat Security Advisory 2017-2760-01

Red Hat Security Advisory 2017-2760-01
Posted Sep 19, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-2760-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: It was found that stacking a file system over procfs in the Linux kernel could lead to a kernel stack overflow due to deep nesting, as demonstrated by mounting ecryptfs over procfs and creating a recursion by mapping /proc/environ. An unprivileged, local user could potentially use this flaw to escalate their privileges on the system.

tags | advisory, overflow, kernel, local
systems | linux, redhat
advisories | CVE-2016-1583
SHA-256 | 63f5ba90523673c11c99253e704d39c3afc183161c91cfb839cfbf9db858fc32
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Red Hat Security Advisory 2017-2760-01

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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2017:2760-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2760
Issue date:        2017-09-19
CVE Names:         CVE-2016-1583 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.7
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 HPC Node EUS (v. 6.7) - noarch, x86_64
Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7) - x86_64
Red Hat Enterprise Linux Server EUS (v. 6.7) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 6.7) - i386, ppc64, s390x, x86_64

3. Description:

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

Security Fix(es):

* It was found that stacking a file system over procfs in the Linux kernel
could lead to a kernel stack overflow due to deep nesting, as demonstrated
by mounting ecryptfs over procfs and creating a recursion by mapping
/proc/environ. An unprivileged, local user could potentially use this flaw
to escalate their privileges on the system. (CVE-2016-1583, Important)

Bug Fix(es):

* Previously, while the MAP_GROWSDOWN flag was set, writing to the memory
which was mapped with the mmap system call failed with the SIGBUS signal.
This update fixes memory management in the Linux kernel by backporting an
upstream patch that enlarges the stack guard page gap. As a result, mmap
now works as expected under the described circumstances. (BZ#1474721)

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/):

1344721 - CVE-2016-1583 kernel: Stack overflow via ecryptfs and /proc/$pid/environ

6. Package List:

Red Hat Enterprise Linux HPC Node EUS (v. 6.7):

Source:
kernel-2.6.32-573.47.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-573.47.1.el6.noarch.rpm
kernel-doc-2.6.32-573.47.1.el6.noarch.rpm
kernel-firmware-2.6.32-573.47.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debug-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-573.47.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-573.47.1.el6.i686.rpm
kernel-debug-devel-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.i686.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-573.47.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-573.47.1.el6.x86_64.rpm
kernel-devel-2.6.32-573.47.1.el6.x86_64.rpm
kernel-headers-2.6.32-573.47.1.el6.x86_64.rpm
perf-2.6.32-573.47.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm
perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7):

x86_64:
kernel-debug-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-573.47.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
python-perf-2.6.32-573.47.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.7):

Source:
kernel-2.6.32-573.47.1.el6.src.rpm

i386:
kernel-2.6.32-573.47.1.el6.i686.rpm
kernel-debug-2.6.32-573.47.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-573.47.1.el6.i686.rpm
kernel-debug-devel-2.6.32-573.47.1.el6.i686.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-573.47.1.el6.i686.rpm
kernel-devel-2.6.32-573.47.1.el6.i686.rpm
kernel-headers-2.6.32-573.47.1.el6.i686.rpm
perf-2.6.32-573.47.1.el6.i686.rpm
perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-573.47.1.el6.noarch.rpm
kernel-doc-2.6.32-573.47.1.el6.noarch.rpm
kernel-firmware-2.6.32-573.47.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-573.47.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-573.47.1.el6.ppc64.rpm
kernel-debug-2.6.32-573.47.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-573.47.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-573.47.1.el6.ppc64.rpm
kernel-devel-2.6.32-573.47.1.el6.ppc64.rpm
kernel-headers-2.6.32-573.47.1.el6.ppc64.rpm
perf-2.6.32-573.47.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-573.47.1.el6.s390x.rpm
kernel-debug-2.6.32-573.47.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-573.47.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-573.47.1.el6.s390x.rpm
kernel-devel-2.6.32-573.47.1.el6.s390x.rpm
kernel-headers-2.6.32-573.47.1.el6.s390x.rpm
kernel-kdump-2.6.32-573.47.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-573.47.1.el6.s390x.rpm
perf-2.6.32-573.47.1.el6.s390x.rpm
perf-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.s390x.rpm

x86_64:
kernel-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debug-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-573.47.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-573.47.1.el6.i686.rpm
kernel-debug-devel-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.i686.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-573.47.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-573.47.1.el6.x86_64.rpm
kernel-devel-2.6.32-573.47.1.el6.x86_64.rpm
kernel-headers-2.6.32-573.47.1.el6.x86_64.rpm
perf-2.6.32-573.47.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm
perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 6.7):

i386:
kernel-debug-debuginfo-2.6.32-573.47.1.el6.i686.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-573.47.1.el6.i686.rpm
perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm
python-perf-2.6.32-573.47.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-573.47.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
python-perf-2.6.32-573.47.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-573.47.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
perf-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
python-perf-2.6.32-573.47.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-573.47.1.el6.s390x.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-573.47.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
python-perf-2.6.32-573.47.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-573.47.1.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-2016-1583
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 2017 Red Hat, Inc.
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