USN-3680-1: libvirt vulnerability and update

12 June 2018

Side channel execution mitigations were added to libvirt.

Releases

Packages

  • libvirt - Libvirt virtualization toolkit

Details

Ken Johnson and Jann Horn independently discovered that microprocessors
utilizing speculative execution of a memory read may allow unauthorized
memory reads via sidechannel attacks. An attacker in the guest could use
this to expose sensitive guest information, including kernel memory. This
update allows libvirt to expose new CPU features added by microcode updates
to guests. (CVE-2018-3639)

Daniel P. Berrange discovered that libvirt incorrectly handled the QEMU
guest agent. An attacker could possibly use this issue to consume
resources, leading to a denial of service. (CVE-2018-1064)

Update instructions

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

Ubuntu 18.04
Ubuntu 17.10
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-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-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-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-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-3651-1: qemu-system, qemu, qemu-system-x86
  • 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-3756-1: intel-microcode
  • 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-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