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Red Hat Enterprise Linux 7.3: Critical Cache Side-Channel RHSA-2018:3398-01

red hat
Calendar Grey October 30, 2018
Dist Redhat Esm H88
A significant security patch for libvirt in CentOS addresses a severe cache side-channel vulnerability.
An update for libvirt is now available for Red Hat Enterprise Linux 7.3 Extended Update Support

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 the updated packages, libvirtd will be restarted automatically.

Summary

The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.
Security Fix(es):
* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639 virt-ssbd AMD)
Note: This is the libvirt side of the CVE-2018-3639 mitigation.
Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.

Topics%20covered

Topics Covered

security advisory critical Red Hat Enterprise Linux important libvirt update cache side-channel Linux server update

References

https://access.redhat.com/security/cve/CVE-2018-3639 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/security/vulnerabilities/ssbd

Package List

Red Hat Enterprise Linux ComputeNode EUS (v. 7.3):
Source: libvirt-2.0.0-10.el7_3.13.src.rpm
x86_64: libvirt-client-2.0.0-10.el7_3.13.i686.rpm libvirt-client-2.0.0-10.el7_3.13.x86_64.rpm libvirt-debuginfo-2.0.0-10.el7_3.13.i686.rpm libvirt-debuginfo-2.0.0-10.el7_3.13.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3):
x86_64: libvirt-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-config-network-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-config-nwfilter-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-driver-interface-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-driver-lxc-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-driver-network-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-driver-nodedev-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-driver-nwfilter-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-driver-qemu-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-driver-secret-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-driver-storage-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-kvm-2.0.0-10.el7_3.13.x86_64.rpm libvirt-daemon-lxc-2.0.0-10.el7_3.13.x86_64.rpm libvirt-debuginfo-2.0.0-10.el7_3.13.i686.rpm libvirt-debuginfo-2.0.0-10.el7_3.13.x86_64.rpm libvirt-devel-2.0.0-10.el7_3.13.i686.rpm libvirt-devel-2.0.0-10.el7_3.13.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:3398-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:3398
Issue date: 2018-10-30

Topic

An update for libvirt is now available for Red Hat Enterprise Linux 7.3Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory critical Red Hat Enterprise Linux important libvirt update cache side-channel Linux server update

Relevant Releases Architectures

Red Hat Enterprise Linux ComputeNode EUS (v. 7.3) - x86_64

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3) - x86_64

Red Hat Enterprise Linux Server EUS (v. 7.3) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.3) - ppc64, ppc64le, s390x, x86_64

Bugs Fixed

1566890 - CVE-2018-3639 hw: cpu: speculative store bypass

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