Synopsis

Important: qemu-kvm-rhev security update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm-rhev is now available for Red Hat OpenStack Platform 13.0 (Queens).

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-rhev packages provide the user-space component for running virtual machines that use KVM in environments managed by Red Hat products.

Security Fix(es):

• A flaw was found in the implementation of the "fill buffer", a mechanism used by modern CPUs when a cache-miss is made on L1 CPU cache. If an attacker can generate a load operation that would create a page fault, the execution will continue speculatively with incorrect data from the fill buffer while the data is fetched from higher level caches. This response time can be measured to infer data in the fill buffer. (CVE-2018-12130)
  
• Modern Intel microprocessors implement hardware-level micro-optimizations to improve the performance of writing data back to CPU caches. The write operation is split into STA (STore Address) and STD (STore Data) sub-operations. These sub-operations allow the processor to hand-off address generation logic into these sub-operations for optimized writes. Both of these sub-operations write to a shared distributed processor structure called the 'processor store buffer'. As a result, an unprivileged attacker could use this flaw to read private data resident within the CPU's processor store buffer. (CVE-2018-12126)
  
• Microprocessors use a ‘load port’ subcomponent to perform load operations from memory or IO. During a load operation, the load port receives data from the memory or IO subsystem and then provides the data to the CPU registers and operations in the CPU’s pipelines. Stale load operations results are stored in the 'load port' table until overwritten by newer operations. Certain load-port operations triggered by an attacker can be used to reveal data about previous stale requests leaking data back to the attacker via a timing side-channel. (CVE-2018-12127)
  
• Uncacheable memory on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access. (CVE-2019-11091)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Affected Products

• Red Hat OpenStack 13 x86_64
• Red Hat OpenStack for IBM Power 13 ppc64le

Fixes

• BZ - 1646781 - CVE-2018-12126 hardware: Microarchitectural Store Buffer Data Sampling (MSBDS)
• BZ - 1646784 - CVE-2018-12130 hardware: Microarchitectural Fill Buffer Data Sampling (MFBDS)
• BZ - 1667782 - CVE-2018-12127 hardware: Micro-architectural Load Port Data Sampling - Information Leak (MLPDS)
• BZ - 1705312 - CVE-2019-11091 hardware: Microarchitectural Data Sampling Uncacheable Memory (MDSUM)

CVEs

• CVE-2018-12126
• CVE-2018-12127
• CVE-2018-12130
• CVE-2019-11091

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/mds

Red Hat OpenStack 13

SRPM
qemu-kvm-rhev-2.12.0-18.el7_6.5.src.rpm	SHA-256: d18197e649d033efe09fa35b3a9da16730fe5aa42475c54f7696601386f3ff2a
x86_64
qemu-img-rhev-2.12.0-18.el7_6.5.x86_64.rpm	SHA-256: b55e2fa190cacf9754785c5761d40aa31619f1cdfbd5f59d10b9c230251f23c0
qemu-kvm-common-rhev-2.12.0-18.el7_6.5.x86_64.rpm	SHA-256: 565b5deb605feb4f287ddcd8a48feb7be8f56e9d16b249ce0306078cd3e6e18b
qemu-kvm-rhev-2.12.0-18.el7_6.5.x86_64.rpm	SHA-256: cfca03e785d5f96050facd8d44846bed4cbb81875bdf03113cec3e34a8b95468
qemu-kvm-rhev-debuginfo-2.12.0-18.el7_6.5.x86_64.rpm	SHA-256: 3a48210351d498e42f39620596f499dbf1c1657fe0a8c24ed77cc1ae9defe04a
qemu-kvm-tools-rhev-2.12.0-18.el7_6.5.x86_64.rpm	SHA-256: b5fe79812f2620db306736662446134616c18f6bd130e9e0479ab04b0ad6d1f5

Red Hat OpenStack for IBM Power 13

SRPM
qemu-kvm-rhev-2.12.0-18.el7_6.5.src.rpm	SHA-256: d18197e649d033efe09fa35b3a9da16730fe5aa42475c54f7696601386f3ff2a
ppc64le
qemu-img-rhev-2.12.0-18.el7_6.5.ppc64le.rpm	SHA-256: 8e4367c41a698e9fb3ff39f7c21a8b1d82dbdc1ef9ae48d8c01b2db6f3b872fb
qemu-kvm-common-rhev-2.12.0-18.el7_6.5.ppc64le.rpm	SHA-256: 9d6bf4604d044ee2440faf2b2e9358891a4e8925b4eafed1587d8fb4d0caffcd
qemu-kvm-rhev-2.12.0-18.el7_6.5.ppc64le.rpm	SHA-256: 5584a052ed65f0011427ecd56bffa4b39b045d15cb58e31f29894d921e59a821
qemu-kvm-rhev-debuginfo-2.12.0-18.el7_6.5.ppc64le.rpm	SHA-256: f048c98590408c48b8777c075f1377324771965aeeed01a8b965fc79856ac46a
qemu-kvm-tools-rhev-2.12.0-18.el7_6.5.ppc64le.rpm	SHA-256: 956ae79e54db572174de1578f8eea33fa51999d94893c5c8f1b3e91af42a53a8