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)
  

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_5.16.src.rpm	SHA-256: bcad6ca4c2ef69d92d5e1062414b46bd33a64a11becb232d345fc96954530266
x86_64
libvirt-0.10.2-29.el6_5.16.x86_64.rpm	SHA-256: 8ee725daf506b882f8a45afdd93564e323717d5d8ff2baef8e1ff278bfd01ddf
libvirt-client-0.10.2-29.el6_5.16.i686.rpm	SHA-256: 5537e86289a5c926483480584ab01bd1b707bf5aab9ed5a1510b8c78229747f0
libvirt-client-0.10.2-29.el6_5.16.x86_64.rpm	SHA-256: 22c5b7b38ce79ec7ea4025b97d52aab2c6e4def3fd5dd98178eddecd23c78351
libvirt-debuginfo-0.10.2-29.el6_5.16.i686.rpm	SHA-256: 5da502dedef0197685763e00995267dbfef8a5284f244cffc382e0d58e844d83
libvirt-debuginfo-0.10.2-29.el6_5.16.x86_64.rpm	SHA-256: def7a4f3df168e1ae96dd4f0991f2851a5c3a877beb376d4fffb253fb2d9866b
libvirt-debuginfo-0.10.2-29.el6_5.16.x86_64.rpm	SHA-256: def7a4f3df168e1ae96dd4f0991f2851a5c3a877beb376d4fffb253fb2d9866b
libvirt-devel-0.10.2-29.el6_5.16.i686.rpm	SHA-256: d29706e5665d8b468182c5912e683bf2e0de08577c76d41e5f31a18ed502f000
libvirt-devel-0.10.2-29.el6_5.16.x86_64.rpm	SHA-256: c5f373d65463ec9106c884c7e4c444d12d7ffadafc49b200ba12ff7fc6302cb6
libvirt-lock-sanlock-0.10.2-29.el6_5.16.x86_64.rpm	SHA-256: 7908a3e162c9caf381ba87ab3d8efd086c60f8bdee89225f039ea0f8c1d2fe12
libvirt-python-0.10.2-29.el6_5.16.x86_64.rpm	SHA-256: ced59a69446ff1e5b274b17bc3d741cc0aa98c4a02b72ee6ccad4c22108c4619