USN-3756-1: Intel Microcode vulnerabilities

27 August 2018

The system could be made to expose sensitive information.

Releases

Packages

  • intel-microcode - Processor microcode for Intel CPUs

Details

It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker in a guest virtual machine could use this to expose sensitive
information (memory from other guests or the host OS). (CVE-2018-3646)

Jann Horn and Ken Johnson discovered that microprocessors utilizing
speculative execution of a memory read may allow unauthorized memory reads
via a sidechannel attack. This flaw is known as Spectre Variant 4. A local
attacker could use this to expose sensitive information, including kernel
memory. (CVE-2018-3639)

Zdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy
discovered that microprocessors that perform speculative reads of
system registers may allow unauthorized disclosure of system parameters
via a sidechannel attack. This vulnerability is also known as Rogue
System Register Read (RSRE). An attacker could use this to expose
sensitive information. (CVE-2018-3640)

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

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

Related notices

  • USN-3742-2: linux-lts-trusty, linux-image-3.13.0-155-generic-lpae, linux-image-generic-lts-trusty, linux-image-3.13.0-155-generic, linux-image-generic-lpae-lts-trusty
  • USN-3654-1: linux-image-4.4.0-127-lowlatency, linux, linux-image-aws, linux-image-4.4.0-127-powerpc-smp, linux-image-4.4.0-127-powerpc64-emb, linux-aws, linux-image-powerpc-e500mc, linux-image-4.4.0-127-powerpc-e500mc, linux-image-generic, linux-image-lowlatency, linux-image-4.4.0-127-generic, linux-image-powerpc64-emb, linux-image-generic-lpae, linux-image-powerpc-smp, linux-image-4.4.0-127-generic-lpae, linux-image-4.4.0-1060-aws, linux-image-4.4.0-1026-kvm, linux-kvm, linux-image-4.4.0-127-powerpc64-smp, linux-image-kvm, linux-image-powerpc64-smp
  • USN-3653-1: linux-image-generic, linux-image-lowlatency, linux-image-4.13.0-43-generic-lpae, linux-image-4.13.0-43-lowlatency, linux, linux-image-4.13.0-43-generic, linux-image-generic-lpae
  • USN-3654-2: linux-image-4.4.0-127-generic-lpae, linux-image-4.4.0-127-lowlatency, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-127-generic, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-127-powerpc64-smp, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-lts-xenial, linux-image-aws, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-127-powerpc-smp, linux-image-4.4.0-1022-aws, linux-image-4.4.0-127-powerpc-e500mc, linux-image-generic-lts-xenial, linux-image-4.4.0-127-powerpc64-emb, linux-aws, linux-image-lowlatency-lts-xenial
  • USN-3680-1: libvirt-bin, libvirt0, libvirt
  • USN-3655-1: linux-image-generic, linux-image-lowlatency, linux-image-3.13.0-149-powerpc-e500mc, linux-image-3.13.0-149-powerpc64-smp, linux-image-3.13.0-149-powerpc-e500, linux-image-powerpc-e500mc, linux-image-3.13.0-149-generic, linux-image-3.13.0-149-powerpc-smp, linux, linux-image-powerpc64-emb, linux-image-3.13.0-149-lowlatency, linux-image-powerpc-e500, linux-image-generic-lpae, linux-image-powerpc-smp, linux-image-powerpc64-smp, linux-image-3.13.0-149-powerpc64-emb, linux-image-3.13.0-149-generic-lpae
  • USN-3740-2: linux-image-4.15.0-1017-gcp, linux-image-4.15.0-32-generic, linux-azure, linux-image-generic-lpae-hwe-16.04, linux-image-gke, linux-hwe, linux-image-lowlatency-hwe-16.04, linux-gcp, linux-image-azure, linux-image-4.15.0-32-lowlatency, linux-image-virtual-hwe-16.04, linux-image-4.15.0-32-generic-lpae, linux-image-gcp, linux-image-generic-hwe-16.04, linux-image-4.15.0-1021-azure
  • USN-3679-1: qemu-system, qemu, qemu-system-x86
  • USN-3653-2: linux-azure, linux-image-generic-lpae-hwe-16.04, linux-image-gke, linux-image-4.13.0-43-generic-lpae, linux-hwe, linux-image-4.13.0-43-lowlatency, linux-gcp, linux-image-lowlatency-hwe-16.04, linux-image-azure, linux-image-oem, linux-oem, linux-image-4.13.0-43-generic, linux-image-4.13.0-1017-gcp, linux-image-4.13.0-1028-oem, linux-image-generic-hwe-16.04, linux-image-gcp, linux-image-4.13.0-1018-azure
  • USN-3742-1: linux-image-generic, linux-image-lowlatency, linux-image-3.13.0-155-powerpc-e500mc, linux-image-3.13.0-155-powerpc64-emb, linux-image-3.13.0-155-generic-lpae, linux-image-powerpc-e500mc, linux, linux-image-powerpc64-emb, linux-image-3.13.0-155-generic, linux-image-3.13.0-155-powerpc-smp, linux-image-3.13.0-155-powerpc64-smp, linux-image-3.13.0-155-lowlatency, linux-image-powerpc-e500, linux-image-generic-lpae, linux-image-powerpc-smp, linux-image-powerpc64-smp, linux-image-3.13.0-155-powerpc-e500
  • USN-3777-3: linux-image-azure, linux-image-4.15.0-1025-azure, linux-azure
  • USN-3652-1: linux, linux-image-aws, linux-aws, linux-image-azure-edge, linux-image-gke, linux-image-4.15.0-22-generic, linux-image-generic, linux-image-lowlatency, linux-image-oem, linux-gcp, linux-image-4.15.0-1008-gcp, linux-image-4.15.0-22-lowlatency, linux-image-4.15.0-1009-aws, linux-image-4.15.0-22-generic-lpae, linux-image-generic-lpae, linux-azure, linux-kvm, linux-oem, linux-image-azure, linux-image-kvm, linux-image-gcp, linux-image-4.15.0-1010-kvm
  • USN-3740-1: linux-image-4.15.0-1019-kvm, linux-image-snapdragon, linux, linux-image-aws, linux-image-4.15.0-32-generic-lpae, linux-image-4.15.0-1020-raspi2, linux-aws, linux-image-azure-edge, linux-image-gke, linux-image-4.15.0-32-snapdragon, linux-image-4.15.0-32-lowlatency, linux-image-4.15.0-1015-oem, linux-image-generic, linux-image-lowlatency, linux-image-oem, linux-gcp, linux-image-raspi2, linux-image-4.15.0-1021-azure, linux-image-generic-lpae, linux-image-4.15.0-1019-aws, linux-raspi2, linux-image-4.15.0-1017-gcp, linux-image-4.15.0-32-generic, linux-azure, linux-kvm, linux-oem, linux-image-azure, linux-image-kvm, linux-image-gcp
  • USN-3741-2: linux-image-4.4.0-133-powerpc-smp, linux-image-4.4.0-133-powerpc64-emb, linux-image-4.4.0-133-powerpc-e500mc, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-1027-aws, linux-image-powerpc-e500mc-lts-xenial, linux-lts-xenial, linux-image-4.4.0-133-generic, linux-aws, linux-image-aws, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-133-powerpc64-smp, linux-image-generic-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-133-lowlatency, linux-image-4.4.0-133-generic-lpae
  • USN-3823-1: linux-image-generic, linux-image-virtual, linux-image-3.2.0-137-highbank, linux-image-3.2.0-137-powerpc-smp, linux-image-3.2.0-137-virtual, linux-image-3.2.0-137-generic, linux-image-highbank, linux, linux-image-3.2.0-137-generic-pae, linux-image-3.2.0-137-omap, linux-image-3.2.0-137-powerpc64-smp, linux-image-omap, linux-image-generic-pae, linux-image-powerpc, linux-image-powerpc-smp, linux-image-powerpc64-smp
  • USN-3655-2: linux-lts-trusty, linux-image-3.13.0-149-generic, linux-image-generic-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-149-generic-lpae
  • USN-3741-1: linux-image-4.4.0-1094-raspi2, linux-image-4.4.0-133-powerpc-e500mc, linux-snapdragon, linux-image-snapdragon, linux, linux-image-4.4.0-133-generic, linux-image-aws, linux-aws, linux-image-powerpc64-smp, linux-image-powerpc-e500mc, linux-image-4.4.0-1098-snapdragon, linux-image-4.4.0-133-powerpc64-smp, linux-image-generic, linux-image-lowlatency, linux-image-powerpc64-emb, linux-image-raspi2, linux-image-4.4.0-1065-aws, linux-image-generic-lpae, linux-image-4.4.0-133-lowlatency, linux-image-powerpc-smp, linux-raspi2, linux-image-4.4.0-133-powerpc-smp, linux-image-4.4.0-133-powerpc64-emb, linux-kvm, linux-image-4.4.0-1031-kvm, linux-image-kvm, linux-image-4.4.0-133-generic-lpae
  • USN-3651-1: qemu-system, qemu, qemu-system-x86