ESB-2018.0119 - [Ubuntu] kernel: Access privileged data - Existing account 2018-01-11

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

                               ESB-2018.0119
                         Linux kernel regressions
                              11 January 2018

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

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

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-17864 CVE-2017-17863 CVE-2017-17862
                   CVE-2017-16995 CVE-2017-5754 

Reference:         ASB-2018.0009
                   ASB-2018.0002.4
                   ESB-2018.0118

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3522-4
   http://www.ubuntu.com/usn/usn-3523-3
   http://www.ubuntu.com/usn/usn-3524-2
   http://www.ubuntu.com/usn/usn-3525-1

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

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

==========================================================================
Ubuntu Security Notice USN-3522-4
January 10, 2018

linux-lts-xenial regression
==========================================================================

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

- - Ubuntu 14.04 LTS

Summary:

USN-3522-2 introduced a regression in the Linux Hardware Enablement kernel.

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

Details:

USN-3522-2 fixed a vulnerability in the Linux Hardware Enablement
kernel for Ubuntu 14.04 LTS to address Meltdown (CVE-2017-5754).
Unfortunately, that update introduced a regression where a few systems
failed to boot successfully. This update fixes the problem.

We apologize for the inconvenience.

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.

Update instructions:

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-109-generic   4.4.0-109.132~14.04.1
  linux-image-4.4.0-109-lowlatency  4.4.0-109.132~14.04.1
  linux-image-generic-lts-xenial  4.4.0.109.92
  linux-image-lowlatency-lts-xenial  4.4.0.109.92

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-3522-4
  https://www.ubuntu.com/usn/usn-3522-1
  https://launchpad.net/bugs/1741934, https://usn.ubuntu.com/usn/usn-3522-2

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-109.132~14.04.1

==========================================================================
Ubuntu Security Notice USN-3523-3
January 10, 2018

linux-raspi2 vulnerabilities
==========================================================================

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

- - Ubuntu 17.10

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- - linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel did not properly check the relationship between pointer
values and the BPF stack. A local attacker could use this to cause a denial
of service (system crash) or possibly execute arbitrary code.
(CVE-2017-17863)

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel improperly performed sign extension in some situations.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2017-16995)

Alexei Starovoitov discovered that the Berkeley Packet Filter (BPF)
implementation in the Linux kernel contained a branch-pruning logic issue
around unreachable code. A local attacker could use this to cause a denial
of service. (CVE-2017-17862)

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel mishandled pointer data values in some situations. A
local attacker could use this to to expose sensitive information (kernel
memory). (CVE-2017-17864)

Update instructions:

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

Ubuntu 17.10:
  linux-image-4.13.0-1011-raspi2  4.13.0-1011.11
  linux-image-raspi2              4.13.0.1011.9

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-3523-3
  https://www.ubuntu.com/usn/usn-3523-1
  CVE-2017-16995, CVE-2017-17862, CVE-2017-17863, CVE-2017-17864

Package Information:
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.13.0-1011.11

==========================================================================
Ubuntu Security Notice USN-3524-2
January 10, 2018

linux-lts-trusty vulnerability
==========================================================================

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

- - Ubuntu 12.04 ESM

Summary:

The system could be made to expose sensitive information.

Software Description:
- - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM

Details:

USN-3524-1 fixed 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 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.

Update instructions:

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

Ubuntu 12.04 ESM:
  linux-image-3.13.0-139-generic  3.13.0-139.188~precise1
  linux-image-3.13.0-139-generic-lpae  3.13.0-139.188~precise1
  linux-image-generic-lpae-lts-trusty  3.13.0.139.129
  linux-image-generic-lts-trusty  3.13.0.139.129

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-3524-2
  https://www.ubuntu.com/usn/usn-3524-1
  CVE-2017-5754


==========================================================================
Ubuntu Security Notice USN-3525-1
January 10, 2018

linux vulnerability
==========================================================================

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

- - Ubuntu 12.04 ESM

Summary:

The system could be made to expose sensitive information.

Software Description:
- - linux: Linux kernel

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.

Update instructions:

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

Ubuntu 12.04 ESM:
  linux-image-3.2.0-132-generic   3.2.0-132.178
  linux-image-3.2.0-132-generic-pae  3.2.0-132.178
  linux-image-generic             3.2.0.132.146
  linux-image-generic-pae         3.2.0.132.146

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-3525-1
  CVE-2017-5754

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