ESB-2017.2548 - [Ubuntu] kernel: Multiple vulnerabilities 2017-10-11

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

                               ESB-2017.2548
                       Linux kernel vulnerabilities
                              11 October 2017

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

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

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise          -- Existing Account
                   Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-14140 CVE-2017-14106 CVE-2017-12134

Reference:         ESB-2017.2544

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3444-1
   http://www.ubuntu.com/usn/usn-3444-2

Comment: This bulletin contains two (2) Ubuntu security advisories.

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

==========================================================================
Ubuntu Security Notice USN-3444-1
October 10, 2017

linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
==========================================================================

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

- - Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- - linux: Linux kernel
- - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- - linux-gke: Linux kernel for Google Container Engine (GKE) systems
- - linux-kvm: Linux kernel for cloud environments
- - linux-raspi2: Linux kernel for Raspberry Pi 2
- - linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Jan H. Schonherr discovered that the Xen subsystem did not properly handle
block IO merges correctly in some situations. An attacker in a guest vm
could use this to cause a denial of service (host crash) or possibly gain
administrative privileges in the host. (CVE-2017-12134)

Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
stack implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-14106)

Otto Ebeling discovered that the memory manager in the Linux kernel did not
properly check the effective UID in some situations. A local attacker could
use this to expose sensitive information. (CVE-2017-14140)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1008-kvm      4.4.0-1008.13
  linux-image-4.4.0-1032-gke      4.4.0-1032.32
  linux-image-4.4.0-1038-aws      4.4.0-1038.47
  linux-image-4.4.0-1075-raspi2   4.4.0-1075.83
  linux-image-4.4.0-1077-snapdragon  4.4.0-1077.82
  linux-image-4.4.0-97-generic    4.4.0-97.120
  linux-image-4.4.0-97-generic-lpae  4.4.0-97.120
  linux-image-4.4.0-97-lowlatency  4.4.0-97.120
  linux-image-4.4.0-97-powerpc-e500mc  4.4.0-97.120
  linux-image-4.4.0-97-powerpc-smp  4.4.0-97.120
  linux-image-4.4.0-97-powerpc64-emb  4.4.0-97.120
  linux-image-4.4.0-97-powerpc64-smp  4.4.0-97.120
  linux-image-aws                 4.4.0.1038.40
  linux-image-generic             4.4.0.97.102
  linux-image-generic-lpae        4.4.0.97.102
  linux-image-gke                 4.4.0.1032.33
  linux-image-kvm                 4.4.0.1008.8
  linux-image-lowlatency          4.4.0.97.102
  linux-image-powerpc-e500mc      4.4.0.97.102
  linux-image-powerpc-smp         4.4.0.97.102
  linux-image-powerpc64-emb       4.4.0.97.102
  linux-image-powerpc64-smp       4.4.0.97.102
  linux-image-raspi2              4.4.0.1075.75
  linux-image-snapdragon          4.4.0.1077.69

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

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  https://www.ubuntu.com/usn/usn-3444-1
  CVE-2017-12134, CVE-2017-14106, CVE-2017-14140

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-97.120
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1038.47
  https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1032.32
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1008.13
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1075.83
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1077.82

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

==========================================================================
Ubuntu Security Notice USN-3444-2
October 10, 2017

linux-lts-xenial vulnerabilities
==========================================================================

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

- - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-3444-1 fixed 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.

Jan H. Schonherr discovered that the Xen subsystem did not properly handle
block IO merges correctly in some situations. An attacker in a guest vm
could use this to cause a denial of service (host crash) or possibly gain
administrative privileges in the host. (CVE-2017-12134)

Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
stack implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-14106)

Otto Ebeling discovered that the memory manager in the Linux kernel did not
properly check the effective UID in some situations. A local attacker could
use this to expose sensitive information. (CVE-2017-14140)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS:
  linux-image-4.4.0-97-generic    4.4.0-97.120~14.04.1
  linux-image-4.4.0-97-generic-lpae  4.4.0-97.120~14.04.1
  linux-image-4.4.0-97-lowlatency  4.4.0-97.120~14.04.1
  linux-image-4.4.0-97-powerpc-e500mc  4.4.0-97.120~14.04.1
  linux-image-4.4.0-97-powerpc-smp  4.4.0-97.120~14.04.1
  linux-image-4.4.0-97-powerpc64-emb  4.4.0-97.120~14.04.1
  linux-image-4.4.0-97-powerpc64-smp  4.4.0-97.120~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.97.81
  linux-image-generic-lts-xenial  4.4.0.97.81
  linux-image-lowlatency-lts-xenial  4.4.0.97.81
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.97.81
  linux-image-powerpc-smp-lts-xenial  4.4.0.97.81
  linux-image-powerpc64-emb-lts-xenial  4.4.0.97.81
  linux-image-powerpc64-smp-lts-xenial  4.4.0.97.81

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

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  https://www.ubuntu.com/usn/usn-3444-2
  https://www.ubuntu.com/usn/usn-3444-1
  CVE-2017-12134, CVE-2017-14106, CVE-2017-14140

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-97.120~14.04.1

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

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