Scientific Linux Security Update : libvirt on SL7.x x86_64 (20180626) (Spectre)

medium Nessus Plugin ID 110718
New! Plugin Severity Now Using CVSS v3

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The remote Scientific Linux host is missing one or more security updates.


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.

Note: This is the libvirt side of the CVE-2018-3639 mitigation that includes support for guests running on hosts with AMD processors.

Bug Fix(es) :

- Previously, the virtlogd service logged redundant AVC denial errors when a guest virtual machine was started.
With this update, the virtlogd service no longer attempts to send shutdown inhibition calls to systemd, which prevents the described errors from occurring.

- Prior to this update, guest virtual machine actions that use a python library in some cases failed and 'Hash operation not allowed during iteration' error messages were logged. Several redundant thread access checks have been removed, and the problem no longer occurs.

- The 'virsh capabilities' command previously displayed an inaccurate number of 4 KiB memory pages on systems with very large amounts of memory. This update optimizes the memory diagnostic mechanism to ensure memory page numbers are displayed correctly on such systems.


Update the affected packages.

See Also

Plugin Details

Severity: Medium

ID: 110718

File Name: sl_20180626_libvirt_on_SL7_x.nasl

Version: 1.7

Type: local

Agent: unix

Published: 6/27/2018

Updated: 4/15/2021

Dependencies: ssh_get_info.nasl

Risk Information


Risk Factor: Medium

Score: 6.7


Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: E:POC/RL:OF/RC:C


Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

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

Temporal Vector: E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:fermilab:scientific_linux:libvirt, p-cpe:/a:fermilab:scientific_linux:libvirt-admin, p-cpe:/a:fermilab:scientific_linux:libvirt-client, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-config-network, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-config-nwfilter, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-interface, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-lxc, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-network, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-nodedev, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-nwfilter, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-qemu, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-secret, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage-core, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage-disk, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage-gluster, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage-iscsi, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage-logical, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage-mpath, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage-rbd, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-driver-storage-scsi, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-kvm, p-cpe:/a:fermilab:scientific_linux:libvirt-daemon-lxc, p-cpe:/a:fermilab:scientific_linux:libvirt-debuginfo, p-cpe:/a:fermilab:scientific_linux:libvirt-devel, p-cpe:/a:fermilab:scientific_linux:libvirt-docs, p-cpe:/a:fermilab:scientific_linux:libvirt-libs, p-cpe:/a:fermilab:scientific_linux:libvirt-lock-sanlock, p-cpe:/a:fermilab:scientific_linux:libvirt-login-shell, p-cpe:/a:fermilab:scientific_linux:libvirt-nss, x-cpe:/o:fermilab:scientific_linux

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/26/2018

Vulnerability Publication Date: 5/22/2018

Reference Information

CVE: CVE-2018-3639