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Ubuntu Security Notice USN-3641-1

Ubuntu Security Notice USN-3641-1
Posted May 8, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3641-1 - Nick Peterson discovered that the Linux kernel did not properly handle debug exceptions following a MOV/POP to SS instruction. A local attacker could use this to cause a denial of service. This issue only affected the amd64 architecture. Andy Lutomirski discovered that the KVM subsystem of the Linux kernel did not properly emulate the ICEBP instruction following a MOV/POP to SS instruction. A local attacker in a KVM virtual machine could use this to cause a denial of service or possibly escalate privileges inside of the virtual machine. This issue only affected the i386 and amd64 architectures. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-1000199, CVE-2018-1087, CVE-2018-8897
MD5 | 3eb5f495f79959cc7295104509cb457e

Ubuntu Security Notice USN-3641-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3641-1
May 08, 2018

linux, linux-aws, linux-azure, linux-euclid, linux-gcp, linux-hwe,
linux-kvm, linux-lts-xenial, linux-oem, linux-raspi2, and
linux-snapdragon vulnerabilities
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-euclid: Linux kernel for Intel Euclid systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-kvm: Linux kernel for cloud environments
- linux-oem: Linux kernel for OEM processors
- linux-snapdragon: Linux kernel for Snapdragon processors
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Nick Peterson discovered that the Linux kernel did not
properly handle debug exceptions following a MOV/POP to SS
instruction. A local attacker could use this to cause a denial
of service (system crash). This issue only affected the amd64
architecture. (CVE-2018-8897)

Andy Lutomirski discovered that the KVM subsystem of the Linux kernel
did not properly emulate the ICEBP instruction following a MOV/POP
to SS instruction. A local attacker in a KVM virtual machine could
use this to cause a denial of service (guest VM crash) or possibly
escalate privileges inside of the virtual machine. This issue only
affected the i386 and amd64 architectures. (CVE-2018-1087)

Andy Lutomirski discovered that the Linux kernel did not properly
perform error handling on virtualized debug registers. A local
attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2018-1000199)

Update instructions:

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

Ubuntu 17.10:
linux-image-4.13.0-1019-raspi2 4.13.0-1019.20
linux-image-4.13.0-41-generic 4.13.0-41.46
linux-image-4.13.0-41-generic-lpae 4.13.0-41.46
linux-image-4.13.0-41-lowlatency 4.13.0-41.46
linux-image-generic 4.13.0.41.44
linux-image-generic-lpae 4.13.0.41.44
linux-image-lowlatency 4.13.0.41.44
linux-image-raspi2 4.13.0.1019.17

Ubuntu 16.04 LTS:
linux-image-4.13.0-1015-gcp 4.13.0-1015.19
linux-image-4.13.0-1016-azure 4.13.0-1016.19
linux-image-4.13.0-1026-oem 4.13.0-1026.29
linux-image-4.13.0-41-generic 4.13.0-41.46~16.04.1
linux-image-4.13.0-41-generic-lpae 4.13.0-41.46~16.04.1
linux-image-4.13.0-41-lowlatency 4.13.0-41.46~16.04.1
linux-image-4.4.0-1023-kvm 4.4.0-1023.28
linux-image-4.4.0-1057-aws 4.4.0-1057.66
linux-image-4.4.0-1089-raspi2 4.4.0-1089.97
linux-image-4.4.0-1092-snapdragon 4.4.0-1092.97
linux-image-4.4.0-124-generic 4.4.0-124.148
linux-image-4.4.0-124-generic-lpae 4.4.0-124.148
linux-image-4.4.0-124-lowlatency 4.4.0-124.148
linux-image-4.4.0-124-powerpc-e500mc 4.4.0-124.148
linux-image-4.4.0-124-powerpc-smp 4.4.0-124.148
linux-image-4.4.0-124-powerpc64-emb 4.4.0-124.148
linux-image-4.4.0-124-powerpc64-smp 4.4.0-124.148
linux-image-4.4.0-9027-euclid 4.4.0-9027.29
linux-image-aws 4.4.0.1057.59
linux-image-azure 4.13.0.1016.17
linux-image-euclid 4.4.0.9027.28
linux-image-gcp 4.13.0.1015.17
linux-image-generic 4.4.0.124.130
linux-image-generic-hwe-16.04 4.13.0.41.60
linux-image-generic-lpae 4.4.0.124.130
linux-image-generic-lpae-hwe-16.04 4.13.0.41.60
linux-image-gke 4.13.0.1015.17
linux-image-kvm 4.4.0.1023.22
linux-image-lowlatency 4.4.0.124.130
linux-image-lowlatency-hwe-16.04 4.13.0.41.60
linux-image-oem 4.13.0.1026.30
linux-image-powerpc-e500mc 4.4.0.124.130
linux-image-powerpc-smp 4.4.0.124.130
linux-image-powerpc64-emb 4.4.0.124.130
linux-image-powerpc64-smp 4.4.0.124.130
linux-image-raspi2 4.4.0.1089.89
linux-image-snapdragon 4.4.0.1092.84

Ubuntu 14.04 LTS:
linux-image-3.13.0-147-generic 3.13.0-147.196
linux-image-3.13.0-147-generic-lpae 3.13.0-147.196
linux-image-3.13.0-147-lowlatency 3.13.0-147.196
linux-image-3.13.0-147-powerpc-e500 3.13.0-147.196
linux-image-3.13.0-147-powerpc-e500mc 3.13.0-147.196
linux-image-3.13.0-147-powerpc-smp 3.13.0-147.196
linux-image-3.13.0-147-powerpc64-emb 3.13.0-147.196
linux-image-3.13.0-147-powerpc64-smp 3.13.0-147.196
linux-image-4.4.0-1019-aws 4.4.0-1019.19
linux-image-4.4.0-124-generic 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-generic-lpae 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-lowlatency 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-powerpc-e500mc 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-powerpc-smp 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-powerpc64-emb 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-powerpc64-smp 4.4.0-124.148~14.04.1
linux-image-aws 4.4.0.1019.19
linux-image-generic 3.13.0.147.157
linux-image-generic-lpae 3.13.0.147.157
linux-image-generic-lpae-lts-xenial 4.4.0.124.104
linux-image-generic-lts-xenial 4.4.0.124.104
linux-image-generic-pae 3.13.0.147.157
linux-image-lowlatency 3.13.0.147.157
linux-image-lowlatency-lts-xenial 4.4.0.124.104
linux-image-powerpc-e500 3.13.0.147.157
linux-image-powerpc-e500mc 3.13.0.147.157
linux-image-powerpc-e500mc-lts-xenial 4.4.0.124.104
linux-image-powerpc-smp 3.13.0.147.157
linux-image-powerpc-smp-lts-xenial 4.4.0.124.104
linux-image-powerpc64-emb 3.13.0.147.157
linux-image-powerpc64-emb-lts-xenial 4.4.0.124.104
linux-image-powerpc64-smp 3.13.0.147.157
linux-image-powerpc64-smp-lts-xenial 4.4.0.124.104

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://usn.ubuntu.com/usn/usn-3641-1
CVE-2018-1000199, CVE-2018-1087, CVE-2018-8897

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.13.0-41.46
https://launchpad.net/ubuntu/+source/linux-raspi2/4.13.0-1019.20
https://launchpad.net/ubuntu/+source/linux/4.4.0-124.148
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1057.66
https://launchpad.net/ubuntu/+source/linux-azure/4.13.0-1016.19
https://launchpad.net/ubuntu/+source/linux-euclid/4.4.0-9027.29
https://launchpad.net/ubuntu/+source/linux-gcp/4.13.0-1015.19
https://launchpad.net/ubuntu/+source/linux-hwe/4.13.0-41.46~16.04.1
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1023.28
https://launchpad.net/ubuntu/+source/linux-oem/4.13.0-1026.29
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1089.97
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1092.97
https://launchpad.net/ubuntu/+source/linux/3.13.0-147.196
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1019.19
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-124.148~14.04.1

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