ESB-2017.2317 - [RedHat] kernel-rt: Execute arbitrary code/commands - Remote/unauthenticated 2017-09-14

Printable version
PGP/GPG verifiable version

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2317
                   Important: kernel-rt security update
                             14 September 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel-rt
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 7
                   Red Hat Enterprise Linux Server 6
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-1000251  

Reference:         ESB-2017.2298

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2017:2704
   https://access.redhat.com/errata/RHSA-2017:2705
   https://access.redhat.com/errata/RHSA-2017:2706
   https://access.redhat.com/errata/RHSA-2017:2707

Comment: This bulletin contains four (4) Red Hat security advisories.

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

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2017:2704-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2704
Issue date:        2017-09-13
CVE Names:         CVE-2017-1000251 
=====================================================================

1. Summary:

An update for kernel-rt 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 Realtime (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* A stack buffer overflow flaw was found in the way the Bluetooth subsystem
of the Linux kernel processed pending L2CAP configuration responses from a
client. On systems with the stack protection feature enabled in the kernel
(CONFIG_CC_STACKPROTECTOR=y, which is enabled on all architectures other
than s390x and ppc64[le]), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to crash the
system. Due to the nature of the stack protection feature, code execution
cannot be fully ruled out, although we believe it is unlikely. On systems
without the stack protection feature (ppc64[le]; the Bluetooth modules are
not built on s390x), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to remotely
execute arbitrary code on the system with ring 0 (kernel) privileges.
(CVE-2017-1000251, Important)

Red Hat would like to thank Armis 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/):

1489716 - CVE-2017-1000251 kernel: stack buffer overflow in the native Bluetooth stack

6. Package List:

Red Hat Enterprise Linux for Real Time for NFV (v. 7):

Source:
kernel-rt-3.10.0-693.2.2.rt56.623.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-693.2.2.rt56.623.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-693.2.2.rt56.623.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-693.2.2.rt56.623.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.2.2.rt56.623.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-2017-1000251
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/CVE-2017-1000251

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

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2017:2705-01
Product:           Red Hat Enterprise MRG for RHEL-6
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2705
Issue date:        2017-09-13
CVE Names:         CVE-2017-1000251 
=====================================================================

1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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:

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* A stack buffer overflow flaw was found in the way the Bluetooth subsystem
of the Linux kernel processed pending L2CAP configuration responses from a
client. On systems with the stack protection feature enabled in the kernel
(CONFIG_CC_STACKPROTECTOR=y, which is enabled on all architectures other
than s390x and ppc64[le]), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to crash the
system. Due to the nature of the stack protection feature, code execution
cannot be fully ruled out, although we believe it is unlikely. On systems
without the stack protection feature (ppc64[le]; the Bluetooth modules are
not built on s390x), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to remotely
execute arbitrary code on the system with ring 0 (kernel) privileges.
(CVE-2017-1000251, Important)

Red Hat would like to thank Armis 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/):

1489716 - CVE-2017-1000251 kernel: stack buffer overflow in the native Bluetooth stack

6. Package List:

MRG Realtime for RHEL 6 Server v.2:

Source:
kernel-rt-3.10.0-693.2.2.rt56.588.el6rt.src.rpm

noarch:
kernel-rt-doc-3.10.0-693.2.2.rt56.588.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-693.2.2.rt56.588.el6rt.noarch.rpm

x86_64:
kernel-rt-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-693.2.2.rt56.588.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-693.2.2.rt56.588.el6rt.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-2017-1000251
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/CVE-2017-1000251

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

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2017:2706-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2706
Issue date:        2017-09-13
CVE Names:         CVE-2017-1000251 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.2
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 ComputeNode EUS (v. 7.2) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) - x86_64
Red Hat Enterprise Linux Server EUS (v. 7.2) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.2) - ppc64, ppc64le, x86_64

3. Description:

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

Security Fix(es):

* A stack buffer overflow flaw was found in the way the Bluetooth subsystem
of the Linux kernel processed pending L2CAP configuration responses from a
client. On systems with the stack protection feature enabled in the kernel
(CONFIG_CC_STACKPROTECTOR=y, which is enabled on all architectures other
than s390x and ppc64[le]), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to crash the
system. Due to the nature of the stack protection feature, code execution
cannot be fully ruled out, although we believe it is unlikely. On systems
without the stack protection feature (ppc64[le]; the Bluetooth modules are
not built on s390x), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to remotely
execute arbitrary code on the system with ring 0 (kernel) privileges.
(CVE-2017-1000251, Important)

Red Hat would like to thank Armis 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/):

1489716 - CVE-2017-1000251 kernel: stack buffer overflow in the native Bluetooth stack

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.2):

Source:
kernel-3.10.0-327.59.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.59.2.el7.noarch.rpm
kernel-doc-3.10.0-327.59.2.el7.noarch.rpm

x86_64:
kernel-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debug-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.59.2.el7.x86_64.rpm
kernel-devel-3.10.0-327.59.2.el7.x86_64.rpm
kernel-headers-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.59.2.el7.x86_64.rpm
perf-3.10.0-327.59.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
python-perf-3.10.0-327.59.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2):

x86_64:
kernel-debug-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.59.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.2):

Source:
kernel-3.10.0-327.59.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.59.2.el7.noarch.rpm
kernel-doc-3.10.0-327.59.2.el7.noarch.rpm

ppc64:
kernel-3.10.0-327.59.2.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-327.59.2.el7.ppc64.rpm
kernel-debug-3.10.0-327.59.2.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm
kernel-debug-devel-3.10.0-327.59.2.el7.ppc64.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-327.59.2.el7.ppc64.rpm
kernel-devel-3.10.0-327.59.2.el7.ppc64.rpm
kernel-headers-3.10.0-327.59.2.el7.ppc64.rpm
kernel-tools-3.10.0-327.59.2.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm
kernel-tools-libs-3.10.0-327.59.2.el7.ppc64.rpm
perf-3.10.0-327.59.2.el7.ppc64.rpm
perf-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm
python-perf-3.10.0-327.59.2.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-debug-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-devel-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-headers-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-tools-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-327.59.2.el7.ppc64le.rpm
perf-3.10.0-327.59.2.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm
python-perf-3.10.0-327.59.2.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm

s390x:
kernel-3.10.0-327.59.2.el7.s390x.rpm
kernel-debug-3.10.0-327.59.2.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-327.59.2.el7.s390x.rpm
kernel-debug-devel-3.10.0-327.59.2.el7.s390x.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-327.59.2.el7.s390x.rpm
kernel-devel-3.10.0-327.59.2.el7.s390x.rpm
kernel-headers-3.10.0-327.59.2.el7.s390x.rpm
kernel-kdump-3.10.0-327.59.2.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-327.59.2.el7.s390x.rpm
kernel-kdump-devel-3.10.0-327.59.2.el7.s390x.rpm
perf-3.10.0-327.59.2.el7.s390x.rpm
perf-debuginfo-3.10.0-327.59.2.el7.s390x.rpm
python-perf-3.10.0-327.59.2.el7.s390x.rpm
python-perf-debuginfo-3.10.0-327.59.2.el7.s390x.rpm

x86_64:
kernel-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debug-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.59.2.el7.x86_64.rpm
kernel-devel-3.10.0-327.59.2.el7.x86_64.rpm
kernel-headers-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.59.2.el7.x86_64.rpm
perf-3.10.0-327.59.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
python-perf-3.10.0-327.59.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.2):

ppc64:
kernel-debug-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-327.59.2.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-327.59.2.el7.ppc64.rpm
perf-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-327.59.2.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-327.59.2.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.59.2.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.59.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.59.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.59.2.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-2017-1000251
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/CVE-2017-1000251

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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2017:2707-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2707
Issue date:        2017-09-13
CVE Names:         CVE-2017-1000251 
=====================================================================

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 stack buffer overflow flaw was found in the way the Bluetooth subsystem
of the Linux kernel processed pending L2CAP configuration responses from a
client. On systems with the stack protection feature enabled in the kernel
(CONFIG_CC_STACKPROTECTOR=y, which is enabled on all architectures other
than s390x and ppc64[le]), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to crash the
system. Due to the nature of the stack protection feature, code execution
cannot be fully ruled out, although we believe it is unlikely. On systems
without the stack protection feature (ppc64[le]; the Bluetooth modules are
not built on s390x), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to remotely
execute arbitrary code on the system with ring 0 (kernel) privileges.
(CVE-2017-1000251, Important)

Red Hat would like to thank Armis Labs for reporting this issue.

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#1474723)

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/):

1489716 - CVE-2017-1000251 kernel: stack buffer overflow in the native Bluetooth stack

6. Package List:

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

Source:
kernel-2.6.32-431.84.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-431.84.1.el6.noarch.rpm
kernel-doc-2.6.32-431.84.1.el6.noarch.rpm
kernel-firmware-2.6.32-431.84.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debug-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.84.1.el6.x86_64.rpm
kernel-devel-2.6.32-431.84.1.el6.x86_64.rpm
kernel-headers-2.6.32-431.84.1.el6.x86_64.rpm
perf-2.6.32-431.84.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm

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

Source:
kernel-2.6.32-431.84.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-431.84.1.el6.noarch.rpm
kernel-doc-2.6.32-431.84.1.el6.noarch.rpm
kernel-firmware-2.6.32-431.84.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debug-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.84.1.el6.x86_64.rpm
kernel-devel-2.6.32-431.84.1.el6.x86_64.rpm
kernel-headers-2.6.32-431.84.1.el6.x86_64.rpm
perf-2.6.32-431.84.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm

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

Source:
kernel-2.6.32-431.84.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.84.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
python-perf-2.6.32-431.84.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm

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

Source:
kernel-2.6.32-431.84.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.84.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.84.1.el6.x86_64.rpm
python-perf-2.6.32-431.84.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.84.1.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-2017-1000251
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/CVE-2017-1000251

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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