Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 465
Alerts This Week
Warning Icon 1 465

Red Hat Enterprise Linux 6: RHSA-2018:1669 Important libvirt Security Fix

red hat
Calendar Grey May 22, 2018
Scroller Redhat
Red Hat has released a critical libvirt security patch for Enterprise Linux 6 tackling major vulnerabilities. Discover additional details.
An update for libvirt is now available for Red Hat Enterprise Linux 6

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)
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 update security fix Red Hat Enterprise Linux important libvirt cache side-channel

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 Desktop (v. 6):
Source: libvirt-0.10.2-62.el6_9.2.src.rpm
i386: libvirt-0.10.2-62.el6_9.2.i686.rpm libvirt-client-0.10.2-62.el6_9.2.i686.rpm libvirt-debuginfo-0.10.2-62.el6_9.2.i686.rpm libvirt-python-0.10.2-62.el6_9.2.i686.rpm
x86_64: libvirt-0.10.2-62.el6_9.2.x86_64.rpm libvirt-client-0.10.2-62.el6_9.2.i686.rpm libvirt-client-0.10.2-62.el6_9.2.x86_64.rpm libvirt-debuginfo-0.10.2-62.el6_9.2.i686.rpm libvirt-debuginfo-0.10.2-62.el6_9.2.x86_64.rpm libvirt-python-0.10.2-62.el6_9.2.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: libvirt-debuginfo-0.10.2-62.el6_9.2.i686.rpm libvirt-devel-0.10.2-62.el6_9.2.i686.rpm
x86_64: libvirt-debuginfo-0.10.2-62.el6_9.2.i686.rpm libvirt-debuginfo-0.10.2-62.el6_9.2.x86_64.rpm libvirt-devel-0.10.2-62.el6_9.2.i686.rpm libvirt-devel-0.10.2-62.el6_9.2.x86_64.rpm libvirt-lock-sanlock-0.10.2-62.el6_9.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: libvirt-0.10.2-62.el6_9.2.src.rpm
x86_64: libvirt-0.10.2-62.el6_9.2.x86_64.rpm libvirt-client-0.10.2-62.el6_9.2.i686.rpm libvirt-client-0.10.2-62.el6_9.2.x86_64.rpm libvirt-debuginfo-0.10.2-62.el6_9.2.i686.rpm libvirt-debuginfo-0.10.2-62.el6_9.2.x86_64.rpm libvirt-python-0.10.2-62.el6_9.2.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:1669-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1669
Issue date: 2018-05-21

Topic

An update for libvirt is now available for Red Hat Enterprise Linux 6.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 update security fix Red Hat Enterprise Linux important libvirt cache side-channel

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - x86_64

Bugs Fixed

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

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.