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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel Small Stack Guard Page Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1038726
SecurityTracker URL:  http://securitytracker.com/id/1038726
CVE Reference:   CVE-2017-1000364   (Links to External Site)
Date:  Jun 20 2017
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 5, 5.9, 6, 6.4, 6.5, 6.6, 6.7, 7, 7.2
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain elevated privileges on the target system.

A local user can trigger a stack memory allocation flaw in certain cases and execute arbitrary code on the target system with elevated privileges.

The kernel's limited stack guard page memory gap can be "jumped" in cases where heap memory and stack memory are adjacent.

The original advisory is available at:

https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

Qualys Research Labs 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 advisories are available at:

https://access.redhat.com/errata/RHSA-2017:1482
https://access.redhat.com/errata/RHSA-2017:1483
https://access.redhat.com/errata/RHSA-2017:1484
https://access.redhat.com/errata/RHSA-2017:1485
https://access.redhat.com/errata/RHSA-2017:1486
https://access.redhat.com/errata/RHSA-2017:1487
https://access.redhat.com/errata/RHSA-2017:1488
https://access.redhat.com/errata/RHSA-2017:1489
https://access.redhat.com/errata/RHSA-2017:1490

Vendor URL:  access.redhat.com/errata/RHSA-2017:1484 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 20 2017 Linux Kernel Small Stack Guard Page Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2017:1484-01] Important: kernel security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2017:1484-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1484
Issue date:        2017-06-19
CVE Names:         CVE-2017-1000364 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.

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 Client (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

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

Security Fix(es):

* A flaw was found in the way memory was being allocated on the stack for
user space binaries. If heap (or different memory region) and stack memory
regions were adjacent to each other, an attacker could use this flaw to
jump over the stack guard gap, cause controlled memory corruption on
process stack or the adjacent memory region, and thus increase their
privileges on the system. This is a kernel-side mitigation which increases
the stack guard gap size from one page to 1 MiB to make successful
exploitation of this issue more difficult. (CVE-2017-1000364, Important)

Red Hat would like to thank Qualys Research Labs 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/):

1461333 - CVE-2017-1000364 kernel: heap/stack gap jumping via unbounded stack allocations

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
kernel-3.10.0-514.21.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.21.2.el7.noarch.rpm
kernel-doc-3.10.0-514.21.2.el7.noarch.rpm

x86_64:
kernel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.21.2.el7.x86_64.rpm
kernel-devel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-headers-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.21.2.el7.x86_64.rpm
perf-3.10.0-514.21.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.21.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
kernel-3.10.0-514.21.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.21.2.el7.noarch.rpm
kernel-doc-3.10.0-514.21.2.el7.noarch.rpm

x86_64:
kernel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.21.2.el7.x86_64.rpm
kernel-devel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-headers-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.21.2.el7.x86_64.rpm
perf-3.10.0-514.21.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.21.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
kernel-3.10.0-514.21.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.21.2.el7.noarch.rpm
kernel-doc-3.10.0-514.21.2.el7.noarch.rpm

ppc64:
kernel-3.10.0-514.21.2.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-514.21.2.el7.ppc64.rpm
kernel-debug-3.10.0-514.21.2.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm
kernel-debug-devel-3.10.0-514.21.2.el7.ppc64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-514.21.2.el7.ppc64.rpm
kernel-devel-3.10.0-514.21.2.el7.ppc64.rpm
kernel-headers-3.10.0-514.21.2.el7.ppc64.rpm
kernel-tools-3.10.0-514.21.2.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm
kernel-tools-libs-3.10.0-514.21.2.el7.ppc64.rpm
perf-3.10.0-514.21.2.el7.ppc64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm
python-perf-3.10.0-514.21.2.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-debug-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-devel-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-headers-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-tools-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-514.21.2.el7.ppc64le.rpm
perf-3.10.0-514.21.2.el7.ppc64le.rpm
perf-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm
python-perf-3.10.0-514.21.2.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm

s390x:
kernel-3.10.0-514.21.2.el7.s390x.rpm
kernel-debug-3.10.0-514.21.2.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-514.21.2.el7.s390x.rpm
kernel-debug-devel-3.10.0-514.21.2.el7.s390x.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-514.21.2.el7.s390x.rpm
kernel-devel-3.10.0-514.21.2.el7.s390x.rpm
kernel-headers-3.10.0-514.21.2.el7.s390x.rpm
kernel-kdump-3.10.0-514.21.2.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-514.21.2.el7.s390x.rpm
kernel-kdump-devel-3.10.0-514.21.2.el7.s390x.rpm
perf-3.10.0-514.21.2.el7.s390x.rpm
perf-debuginfo-3.10.0-514.21.2.el7.s390x.rpm
python-perf-3.10.0-514.21.2.el7.s390x.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.s390x.rpm

x86_64:
kernel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.21.2.el7.x86_64.rpm
kernel-devel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-headers-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.21.2.el7.x86_64.rpm
perf-3.10.0-514.21.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
kernel-debug-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-514.21.2.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-514.21.2.el7.ppc64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-514.21.2.el7.ppc64le.rpm
perf-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.21.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
kernel-3.10.0-514.21.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.21.2.el7.noarch.rpm
kernel-doc-3.10.0-514.21.2.el7.noarch.rpm

x86_64:
kernel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.21.2.el7.x86_64.rpm
kernel-devel-3.10.0-514.21.2.el7.x86_64.rpm
kernel-headers-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.21.2.el7.x86_64.rpm
perf-3.10.0-514.21.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.21.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.21.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.21.2.el7.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-2017-1000364
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/stackguard

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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