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 instructions (a commonly used performance optimization). There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Variant CVE-2017-5715 triggers the speculative execution by utilizing branch target injection. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation 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 cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks. (CVE-2017-5715)
  

Note: This is the libvirt side of the CVE-2017-5715 mitigation.

Red Hat would like to thank 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 - 1519780 - CVE-2017-5715 hw: cpu: speculative execution branch target injection

CVEs

(none)

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/speculativeexecution
• https://access.redhat.com/security/cve/CVE-2017-5715

Red Hat Enterprise Linux Server - AUS 6.5

SRPM
libvirt-0.10.2-29.el6_5.15.src.rpm	SHA-256: 756d4bde6f0ce4674e168cf144a2c9fe4503dcb9a2f0136274f2ae73dc9ce5c0
x86_64
libvirt-0.10.2-29.el6_5.15.x86_64.rpm	SHA-256: 181a3782ba134ea52405f238db3cd742d8d81b895880a07f0b63c95a3a193b4d
libvirt-client-0.10.2-29.el6_5.15.i686.rpm	SHA-256: d87ae79f3c4038e0e45755de149fdf25a4e09b38805791b23e9b57aa914aab7c
libvirt-client-0.10.2-29.el6_5.15.x86_64.rpm	SHA-256: f4009d8ac37df67290fca769084064ff9db67af71e457c2d7a812e79324c05af
libvirt-debuginfo-0.10.2-29.el6_5.15.i686.rpm	SHA-256: adb625710bbe4dc4698e98d2e4ce6b27f7585beebb33fb5d2c6511f1b14f44d0
libvirt-debuginfo-0.10.2-29.el6_5.15.x86_64.rpm	SHA-256: 75d7d0f97e4451a2cb96cd3c12a134ee830866304fae9343e27b5b160995288a
libvirt-debuginfo-0.10.2-29.el6_5.15.x86_64.rpm	SHA-256: 75d7d0f97e4451a2cb96cd3c12a134ee830866304fae9343e27b5b160995288a
libvirt-devel-0.10.2-29.el6_5.15.i686.rpm	SHA-256: eed3fd262bea18dd26fcb773c351f7601e7d906fcd92a260a7263a8ecfed8c2c
libvirt-devel-0.10.2-29.el6_5.15.x86_64.rpm	SHA-256: 550a52590ffe4472d72774b2fa0e5191c952d6161b07598df1ce7c625b389b5e
libvirt-lock-sanlock-0.10.2-29.el6_5.15.x86_64.rpm	SHA-256: 89dd16377729d37b39196d0dfcb3aff5d03663d1d2e1d5d85c5160d1e571760f
libvirt-python-0.10.2-29.el6_5.15.x86_64.rpm	SHA-256: 0adcf594758891903842a1dab25c2228da02eb0b91dfb04d7745f3450b8ec286