SUSE-SU-2018:1386-1: important: Security update for qemu

[sle-security-updates at lists.suse.com]

   SUSE Security Update: Security update for qemu
______________________________________________________________________________

Announcement ID:    SUSE-SU-2018:1386-1
Rating:             important
References:         #1068032 #1082276 #1092885 
Cross-References:   CVE-2017-5715 CVE-2018-3639
Affected Products:
                    SUSE Linux Enterprise Server 12-LTSS
______________________________________________________________________________

   An update that solves two vulnerabilities and has one
   errata is now available.

Description:

   This update for qemu fixes several issues.

   This security issue was fixed:

   - CVE-2018-3639: Spectre v4 vulnerability mitigation support for KVM
     guests (bsc#1092885).

     Systems with microprocessors utilizing speculative execution and
   speculative execution of memory reads before the addresses of all prior
   memory writes are known may allow unauthorized disclosure of information
   to an attacker with local user access via a side-channel analysis.

     This patch permits the new x86 cpu feature flag named "ssbd" to be
   presented to the guest, given that the host has this feature, and KVM
   exposes it to the guest as well.

     For this feature to be enabled please use the qemu commandline
     -cpu $MODEL,+spec-ctrl,+ssbd so the guest OS can take advantage of the
      feature.

     spec-ctrl and ssbd support is also required in the host.
   - CVE-2017-5715: This update has the next round of Spectre v2 related
     patches, which now integrates with corresponding changes in libvirt. A
     January 2018 release of qemu initially addressed the Spectre v2
     vulnerability for KVM guests by exposing the spec-ctrl feature for all
     x86 vcpu types. We remove that initial patch and now rely on patches
     from upstream (bsc#1068032).

     This update defines spec_ctrl and ibpb cpu feature flags as well as new
   cpu models which are clones of existing models with either -IBRS or -IBPB
   added to the end of the model name. These new vcpu models explicitly
   include the new feature(s), whereas the feature flags can be added to the
   cpu parameter as with
     other features. In short, for continued Spectre v2 protection, ensure
      that either the appropriate cpu feature flag is added to the QEMU
      command-line, or
     one of the new cpu models is used. Although migration from older
      versions is supported, the new cpu features won't be properly exposed
      to the guest until it is restarted with the cpu features explicitly
      added. A reboot is insufficient.
   - A patch is added to continue to detect Spectre v2 mitigation features
     (as shown by cpuid), and if found provide that feature to guests, even
     if running
     on older KVM (kernel) versions which do not yet expose that feature to
      QEMU. (bsc#1082276)


Patch Instructions:

   To install this SUSE Security Update use the SUSE recommended installation methods
   like YaST online_update or "zypper patch".

   Alternatively you can run the command listed for your product:

   - SUSE Linux Enterprise Server 12-LTSS:

      zypper in -t patch SUSE-SLE-SERVER-12-2018-968=1



Package List:

   - SUSE Linux Enterprise Server 12-LTSS (ppc64le s390x x86_64):

      qemu-2.0.2-48.40.2
      qemu-block-curl-2.0.2-48.40.2
      qemu-block-curl-debuginfo-2.0.2-48.40.2
      qemu-debugsource-2.0.2-48.40.2
      qemu-guest-agent-2.0.2-48.40.2
      qemu-guest-agent-debuginfo-2.0.2-48.40.2
      qemu-lang-2.0.2-48.40.2
      qemu-tools-2.0.2-48.40.2
      qemu-tools-debuginfo-2.0.2-48.40.2

   - SUSE Linux Enterprise Server 12-LTSS (s390x x86_64):

      qemu-kvm-2.0.2-48.40.2

   - SUSE Linux Enterprise Server 12-LTSS (ppc64le):

      qemu-ppc-2.0.2-48.40.2
      qemu-ppc-debuginfo-2.0.2-48.40.2

   - SUSE Linux Enterprise Server 12-LTSS (x86_64):

      qemu-block-rbd-2.0.2-48.40.2
      qemu-block-rbd-debuginfo-2.0.2-48.40.2
      qemu-x86-2.0.2-48.40.2
      qemu-x86-debuginfo-2.0.2-48.40.2

   - SUSE Linux Enterprise Server 12-LTSS (noarch):

      qemu-ipxe-1.0.0-48.40.2
      qemu-seabios-1.7.4-48.40.2
      qemu-sgabios-8-48.40.2
      qemu-vgabios-1.7.4-48.40.2

   - SUSE Linux Enterprise Server 12-LTSS (s390x):

      qemu-s390-2.0.2-48.40.2
      qemu-s390-debuginfo-2.0.2-48.40.2


References:

   https://www.suse.com/security/cve/CVE-2017-5715.html
   https://www.suse.com/security/cve/CVE-2018-3639.html
   https://bugzilla.suse.com/1068032
   https://bugzilla.suse.com/1082276
   https://bugzilla.suse.com/1092885