ESB-2018.0233 - [Ubuntu] Linux kernel: Access privileged data - Existing account 2018-01-23

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

                               ESB-2018.0233
         Multiple vulnerabilities have been addressed in security
                       updates for the Linux kernel
                              23 January 2018

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

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

Product:           Linux kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-5754 CVE-2017-5753 CVE-2017-5715

Reference:         ASB-2018.0033
                   ASB-2018.0030
                   ASB-2018.0009
                   ESB-2018.0119
                   ASB-2018.0002.4
                   ESB-2018.0137.2

Original Bulletin: 
   https://usn.ubuntu.com/usn/usn-3540-1/
   https://usn.ubuntu.com/usn/usn-3540-2/
   http://www.ubuntu.com/usn/usn-3541-1
   https://usn.ubuntu.com/usn/usn-3541-2/
   https://usn.ubuntu.com/usn/usn-3542-1/
   https://usn.ubuntu.com/usn/usn-3542-2/

Comment: This bulletin contains six (6) Ubuntu security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

Ubuntu Security Notice USN-3540-1
22nd January, 2018

linux, linux-aws, linux-euclid vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 16.04 LTS
Summary
Several security issues were addressed in the Linux kernel.

Software description
linux - Linux kernel
linux-aws - Linux kernel for Amazon Web Services (AWS) systems
linux-euclid - Linux kernel for Intel Euclid systems
Details
Jann Horn discovered that microprocessors utilizing speculative
execution and branch prediction may allow unauthorized memory
reads via sidechannel attacks. This flaw is known as Spectre. A
local attacker could use this to expose sensitive information,
including kernel memory. This update provides mitigations for the
i386 (CVE-2017-5753 only), amd64, ppc64el, and s390x architectures.
(CVE-2017-5715, CVE-2017-5753)

USN-3522-1 mitigated CVE-2017-5754 (Meltdown) for the amd64
architecture in Ubuntu 16.04 LTS. This update provides the
corresponding mitigations for the ppc64el architecture. Original
advisory details:

Jann Horn discovered that microprocessors utilizing speculative
execution and indirect branch prediction may allow unauthorized memory
reads via sidechannel attacks. This flaw is known as Meltdown. A local
attacker could use this to expose sensitive information, including
kernel memory. (CVE-2017-5754)

Update instructions
The problem can be corrected by updating your system to the following package version:

Ubuntu 16.04 LTS:
linux-image-powerpc-smp 4.4.0.112.118
linux-image-powerpc-e500mc 4.4.0.112.118
linux-image-4.4.0-112-generic-lpae 4.4.0-112.135
linux-image-generic 4.4.0.112.118
linux-image-4.4.0-112-powerpc-smp 4.4.0-112.135
linux-image-euclid 4.4.0.9023.24
linux-image-4.4.0-112-generic 4.4.0-112.135
linux-image-4.4.0-9023-euclid 4.4.0-9023.24
linux-image-powerpc64-emb 4.4.0.112.118
linux-image-4.4.0-1049-aws 4.4.0-1049.58
linux-image-generic-lpae 4.4.0.112.118
linux-image-powerpc64-smp 4.4.0.112.118
linux-image-4.4.0-112-powerpc64-emb 4.4.0-112.135
linux-image-aws 4.4.0.1049.51
linux-image-4.4.0-112-powerpc-e500mc 4.4.0-112.135
linux-image-4.4.0-112-lowlatency 4.4.0-112.135
linux-image-lowlatency 4.4.0.112.118
linux-image-4.4.0-112-powerpc64-smp 4.4.0-112.135
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Please note that fully mitigating CVE-2017-5715 (Spectre Variant 2)
requires corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the IBRS and IBPB features are required to enable the
kernel mitigations. Ubuntu is working with Intel and AMD to provide
future microcode updates that implement IBRS and IBPB as they are made
available. Ubuntu users with a processor from a different vendor should
contact the vendor to identify necessary firmware updates. Ubuntu
will provide corresponding QEMU updates in the future for users of
self-hosted virtual environments in coordination with upstream QEMU.
Ubuntu users in cloud environments should contact the cloud provider
to confirm that the hypervisor has been updated to expose the new
CPU features to virtual machines.

After a standard system update you need to reboot your computer to
make the necessary changes.

References
CVE-2017-5715, CVE-2017-5753, CVE-2017-5754, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown

- ---

USN-3540-2: Linux kernel (Xenial HWE) vulnerabilities
Ubuntu Security Notice USN-3540-2
22nd January, 2018

linux-lts-xenial, linux-aws vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 14.04 LTS
Summary
Several security issues were addressed in the Linux kernel.

Software description
linux-aws - Linux kernel for Amazon Web Services (AWS) systems
linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
Details
USN-3540-1 addressed vulnerabilities in the Linux kernel for Ubuntu
16.04 LTS. This update provides the corresponding updates for the
Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for
Ubuntu 14.04 LTS.

Jann Horn discovered that microprocessors utilizing speculative
execution and branch prediction may allow unauthorized memory
reads via sidechannel attacks. This flaw is known as Spectre. A
local attacker could use this to expose sensitive information,
including kernel memory. This update provides mitigations for the
i386 (CVE-2017-5753 only), amd64, ppc64el, and s390x architectures.
(CVE-2017-5715, CVE-2017-5753)

USN-3522-2 mitigated CVE-2017-5754 (Meltdown) for the amd64
architecture in the Linux Hardware Enablement (HWE) kernel from Ubuntu
16.04 LTS for Ubuntu 14.04 LTS. This update provides the corresponding
mitigations for the ppc64el architecture. Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative
execution and indirect branch prediction may allow unauthorized memory
reads via sidechannel attacks. This flaw is known as Meltdown. A local
attacker could use this to expose sensitive information, including
kernel memory. (CVE-2017-5754)

Update instructions
The problem can be corrected by updating your system to the following package version:

Ubuntu 14.04 LTS:
linux-image-4.4.0-111-powerpc-smp 4.4.0-111.134~14.04.1
linux-image-powerpc-smp-lts-xenial 4.4.0.111.95
linux-image-4.4.0-111-powerpc64-smp 4.4.0-111.134~14.04.1
linux-image-4.4.0-111-powerpc64-emb 4.4.0-111.134~14.04.1
linux-image-4.4.0-1011-aws 4.4.0-1011.11
linux-image-4.4.0-111-powerpc-e500mc 4.4.0-111.134~14.04.1
linux-image-lowlatency-lts-xenial 4.4.0.111.95
linux-image-generic-lts-xenial 4.4.0.111.95
linux-image-4.4.0-111-lowlatency 4.4.0-111.134~14.04.1
linux-image-aws 4.4.0.1011.11
linux-image-powerpc64-smp-lts-xenial 4.4.0.111.95
linux-image-powerpc64-emb-lts-xenial 4.4.0.111.95
linux-image-4.4.0-111-generic 4.4.0-111.134~14.04.1
linux-image-powerpc-e500mc-lts-xenial 4.4.0.111.95
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Please note that fully mitigating CVE-2017-5715 (Spectre Variant 2)
requires corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the IBRS and IBPB features are required to enable the
kernel mitigations. Ubuntu is working with Intel and AMD to provide
future microcode updates that implement IBRS and IBPB as they are made
available. Ubuntu users with a processor from a different vendor should
contact the vendor to identify necessary firmware updates. Ubuntu
will provide corresponding QEMU updates in the future for users of
self-hosted virtual environments in coordination with upstream QEMU.
Ubuntu users in cloud environments should contact the cloud provider
to confirm that the hypervisor has been updated to expose the new
CPU features to virtual machines.

After a standard system update you need to reboot your computer to
apply the necessary changes.

References
CVE-2017-5715, CVE-2017-5753, CVE-2017-5754, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown

- ---

USN-3541-1: Linux kernel vulnerabilities
Ubuntu Security Notice USN-3541-1
22nd January, 2018

linux vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 17.10
Summary
Several security issues were addressed in the Linux kernel.

Software description
linux - Linux kernel
Details
Jann Horn discovered that microprocessors utilizing speculative
execution and branch prediction may allow unauthorized memory
reads via sidechannel attacks. This flaw is known as Spectre. A
local attacker could use this to expose sensitive information,
including kernel memory. This update provides mitigations for the
i386 (CVE-2017-5753 only), amd64, ppc64el, and s390x architectures.
(CVE-2017-5715, CVE-2017-5753)

USN-3523-1 mitigated CVE-2017-5754 (Meltdown) for the amd64
architecture in Ubuntu 17.10. This update provides the corresponding
mitigations for the ppc64el architecture. Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative
execution and indirect branch prediction may allow unauthorized memory
reads via sidechannel attacks. This flaw is known as Meltdown. A local
attacker could use this to expose sensitive information, including
kernel memory. (CVE-2017-5754)

Update instructions
The problem can be corrected by updating your system to the following package version:

Ubuntu 17.10:
linux-image-4.13.0-31-generic 4.13.0-31.34
linux-image-lowlatency 4.13.0.31.33
linux-image-generic 4.13.0.31.33
linux-image-4.13.0-31-lowlatency 4.13.0-31.34
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Please note that fully mitigating CVE-2017-5715 (Spectre Variant 2)
requires corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the IBRS and IBPB features are required to enable the
kernel mitigations. Ubuntu is working with Intel and AMD to provide
future microcode updates that implement IBRS and IBPB as they are made
available. Ubuntu users with a processor from a different vendor should
contact the vendor to identify necessary firmware updates. Ubuntu
will provide corresponding QEMU updates in the future for users of
self-hosted virtual environments in coordination with upstream QEMU.
Ubuntu users in cloud environments should contact the cloud provider
to confirm that the hypervisor has been updated to expose the new
CPU features to virtual machines.

After a standard system update you need to reboot your computer to
apply the necessary changes.

References
CVE-2017-5715, CVE-2017-5753, CVE-2017-5754, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown

- ---

USN-3541-2: Linux kernel (HWE) vulnerabilities
Ubuntu Security Notice USN-3541-2
22nd January, 2018

linux-hwe, linux-azure, linux-gcp, linux-oem vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 16.04 LTS
Summary
Several security issues were addressed in the Linux kernel.

Software description
linux-azure - Linux kernel for Microsoft Azure Cloud systems
linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
linux-hwe - Linux hardware enablement (HWE) kernel
linux-oem - Linux kernel for OEM processors
Details
USN-3541-1 addressed vulnerabilities in the Linux kernel for Ubuntu
17.10. This update provides the corresponding updates for the
Linux Hardware Enablement (HWE) kernel from Ubuntu 17.10 for Ubuntu
16.04 LTS.

Jann Horn discovered that microprocessors utilizing speculative
execution and branch prediction may allow unauthorized memory
reads via sidechannel attacks. This flaw is known as Spectre. A
local attacker could use this to expose sensitive information,
including kernel memory. This update provides mitigations for the
i386 (CVE-2017-5753 only), amd64, ppc64el, and s390x architectures.
(CVE-2017-5715, CVE-2017-5753)

USN-3523-2 mitigated CVE-2017-5754 (Meltdown) for the amd64
architecture in the Linux Hardware Enablement (HWE) kernel from Ubuntu
17.10 for Ubuntu 16.04 LTS. This update provides the corresponding
mitigations for the ppc64el architecture. Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative
execution and indirect branch prediction may allow unauthorized memory
reads via sidechannel attacks. This flaw is known as Meltdown. A local
attacker could use this to expose sensitive information, including
kernel memory. (CVE-2017-5754)

Update instructions
The problem can be corrected by updating your system to the following package version:

Ubuntu 16.04 LTS:
linux-image-gke 4.13.0.1007.9
linux-image-4.13.0-31-generic 4.13.0-31.34~16.04.1
linux-image-4.13.0-1006-azure 4.13.0-1006.8
linux-image-gcp 4.13.0.1007.9
linux-image-lowlatency-hwe-16.04 4.13.0.31.51
linux-image-oem 4.13.0.1017.21
linux-image-4.13.0-31-lowlatency 4.13.0-31.34~16.04.1
linux-image-generic-hwe-16.04 4.13.0.31.51
linux-image-azure 4.13.0.1006.7
linux-image-4.13.0-1007-gcp 4.13.0-1007.10
linux-image-4.13.0-1017-oem 4.13.0-1017.18
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Please note that fully mitigating CVE-2017-5715 (Spectre Variant 2)
requires corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the IBRS and IBPB features are required to enable the
kernel mitigations. Ubuntu is working with Intel and AMD to provide
future microcode updates that implement IBRS and IBPB as they are made
available. Ubuntu users with a processor from a different vendor should
contact the vendor to identify necessary firmware updates. Ubuntu
will provide corresponding QEMU updates in the future for users of
self-hosted virtual environments in coordination with upstream QEMU.
Ubuntu users in cloud environments should contact the cloud provider
to confirm that the hypervisor has been updated to expose the new
CPU features to virtual machines.

After a standard system update you need to reboot your computer to
apply the necessary changes.

References
CVE-2017-5715, CVE-2017-5753, CVE-2017-5754, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown

- ---

USN-3542-1: Linux kernel vulnerabilities
Ubuntu Security Notice USN-3542-1
22nd January, 2018

linux vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 14.04 LTS
Summary
Several security issues were addressed in the Linux kernel.

Software description
linux - Linux kernel
Details
Jann Horn discovered that microprocessors utilizing speculative
execution and branch prediction may allow unauthorized memory reads via
sidechannel attacks. This flaw is known as Spectre. A local attacker
could use this to expose sensitive information, including kernel
memory. This update provides mitigations for the i386 (CVE-2017-5753
only) and amd64 architectures.

Update instructions
The problem can be corrected by updating your system to the following package version:

Ubuntu 14.04 LTS:
linux-image-generic 3.13.0.141.151
linux-image-3.13.0-141-generic 3.13.0-141.190
linux-image-lowlatency 3.13.0.141.151
linux-image-3.13.0-141-lowlatency 3.13.0-141.190
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Please note that fully mitigating CVE-2017-5715 (Spectre Variant 2)
requires corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the IBRS and IBPB features are required to enable the
kernel mitigations. Ubuntu is working with Intel and AMD to provide
future microcode updates that implement IBRS and IBPB as they are made
available. Ubuntu users with a processor from a different vendor should
contact the vendor to identify necessary firmware updates. Ubuntu
will provide corresponding QEMU updates in the future for users of
self-hosted virtual environments in coordination with upstream QEMU.
Ubuntu users in cloud environments should contact the cloud provider
to confirm that the hypervisor has been updated to expose the new
CPU features to virtual machines.

After a standard system update you need to reboot your computer to
apply the necessary changes.

References
CVE-2017-5715, CVE-2017-5753, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown

- ---

USN-3542-2: Linux kernel (Trusty HWE) vulnerabilities
Ubuntu Security Notice USN-3542-2
22nd January, 2018

linux-lts-trusty vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 12.04 LTS
Summary
Several security issues were addressed in the Linux kernel.

Software description
linux-lts-trusty - Linux hardware enablement kernel from Trusty for Precise ESM
Details
USN-3542-1 addressed vulnerabilities in the Linux kernel for Ubuntu
14.04 LTS. This update provides the corresponding updates for the
Linux Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for
Ubuntu 12.04 ESM.

Jann Horn discovered that microprocessors utilizing speculative
execution and branch prediction may allow unauthorized memory reads via
sidechannel attacks. This flaw is known as Spectre. A local attacker
could use this to expose sensitive information, including kernel
memory. This update provides mitigations for the i386 (CVE-2017-5753
only) and amd64 architectures.

Update instructions
The problem can be corrected by updating your system to the following package version:

Ubuntu 12.04 LTS:
linux-image-3.13.0-140-generic 3.13.0-140.189~precise1
linux-image-generic-lts-trusty 3.13.0.140.131
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

Please note that fully mitigating CVE-2017-5715 (Spectre Variant 2)
requires corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the IBRS and IBPB features are required to enable the
kernel mitigations. Ubuntu is working with Intel and AMD to provide
future microcode updates that implement IBRS and IBPB as they are made
available. Ubuntu users with a processor from a different vendor should
contact the vendor to identify necessary firmware updates. Ubuntu
will provide corresponding QEMU updates in the future for users of
self-hosted virtual environments in coordination with upstream QEMU.
Ubuntu users in cloud environments should contact the cloud provider
to confirm that the hypervisor has been updated to expose the new
CPU features to virtual machines.

After a standard system update you need to reboot your computer to
apply the necessary changes.

References
CVE-2017-5715, CVE-2017-5753, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown

- --------------------------END INCLUDED TEXT--------------------

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