RHEL 7 : qemu-kvm (RHSA-2018:2001) (Spectre)

Medium Nessus Plugin ID 110712

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.

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.

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.

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 qemu-kvm side of the CVE-2018-3639 mitigation that includes support for guests running on hosts with AMD processors.

Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.

Solution

Update the affected packages.

See Also

https://access.redhat.com/security/vulnerabilities/ssbd

https://access.redhat.com/errata/RHSA-2018:2001

https://access.redhat.com/security/cve/cve-2018-3639

Plugin Details

Severity: Medium

ID: 110712

File Name: redhat-RHSA-2018-2001.nasl

Version: 1.5

Type: local

Agent: unix

Published: 2018/06/27

Modified: 2018/11/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.9

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:N

CVSS v3.0

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:qemu-img, p-cpe:/a:redhat:enterprise_linux:qemu-kvm, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-common, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-debuginfo, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-tools, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:7.5, cpe:/o:redhat:enterprise_linux:7.6

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Patch Publication Date: 2018/06/26

Reference Information

CVE: CVE-2018-3639

RHSA: 2018:2001