Synopsis

Important: libvirt security update

Type/Severity

Security Advisory: Important

Topic

An update for libvirt is now available for Red Hat Enterprise Linux 6.5 Advanced Update Support.

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

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.

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.

Affected Products

• Red Hat Enterprise Linux Server - AUS 6.5 x86_64

Fixes

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

CVEs

• CVE-2018-3639

References

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

Red Hat Enterprise Linux Server - AUS 6.5

SRPM
libvirt-0.10.2-29.el6_5.17.src.rpm	SHA-256: 4dfda7ddf5469499b1909600eeca4e4037eff8b2ca783e239f6299d0b3360502
x86_64
libvirt-0.10.2-29.el6_5.17.x86_64.rpm	SHA-256: 2858848a1b5340cd89266422616723fbc173ee16817d451f8123947300abbf1d
libvirt-client-0.10.2-29.el6_5.17.i686.rpm	SHA-256: 8d20e62229cf939fee3fbafd91fcce76bc1e1f0c21beceab11b0acc0c5d63ef9
libvirt-client-0.10.2-29.el6_5.17.x86_64.rpm	SHA-256: 2e3cd862eec8add8b84a8bde25ec605b6c092db3bf1b3ec0ac7f2dc44bf587ac
libvirt-debuginfo-0.10.2-29.el6_5.17.i686.rpm	SHA-256: b62cee6255dc6b0162db81b94e6e9850c2d49604fa81a87cd76af83ece45d749
libvirt-debuginfo-0.10.2-29.el6_5.17.x86_64.rpm	SHA-256: c17ea0dbd2c7d9bd4cc6e5285bfddec51e8b4ed342b326ff126fd95f6141fd59
libvirt-debuginfo-0.10.2-29.el6_5.17.x86_64.rpm	SHA-256: c17ea0dbd2c7d9bd4cc6e5285bfddec51e8b4ed342b326ff126fd95f6141fd59
libvirt-devel-0.10.2-29.el6_5.17.i686.rpm	SHA-256: c98af73beeb40e722944bea3886e5d5af3ccef1954ce72fb40c37ab594df5f20
libvirt-devel-0.10.2-29.el6_5.17.x86_64.rpm	SHA-256: c374fbace2d6a0934edc87c63520c11b5203fdd916403af41317042355a38134
libvirt-lock-sanlock-0.10.2-29.el6_5.17.x86_64.rpm	SHA-256: 40070525e203c6f55216a212f597edd96c8cf276c9a28fa342631985fe766520
libvirt-python-0.10.2-29.el6_5.17.x86_64.rpm	SHA-256: af82aac6936a5fc1da64befca112fddf45a241dfb10e1a8ba794d1bc58909abe