Oracle Linux 7 : kernel (ELSA-2018-1629) (Spectre)

medium Nessus Plugin ID 109977
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VPR Score: 5.1

Synopsis

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

Description

From Red Hat Security Advisory 2018:1629 :

An update for kernel 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.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

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 issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software side of the mitigation for this hardware issue. To be fully functional, up-to-date CPU microcode applied on the system is required. Please refer to References section for further information about this issue, CPU microcode requirements and the potential performance impact.

In this update mitigations for x86-64 architecture are provided.

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 kernel packages.

See Also

https://oss.oracle.com/pipermail/el-errata/2018-May/007750.html

Plugin Details

Severity: Medium

ID: 109977

File Name: oraclelinux_ELSA-2018-1629.nasl

Version: 1.11

Type: local

Agent: unix

Published: 5/23/2018

Updated: 9/27/2019

Dependencies: 122878, 12634

Risk Information

Risk Factor: Medium

VPR Score: 5.1

CVSS v2.0

Base Score: 4.9

Temporal Score: 3.8

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

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

CVSS v3.0

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:oracle:linux:kernel, p-cpe:/a:oracle:linux:kernel-abi-whitelists, p-cpe:/a:oracle:linux:kernel-debug, p-cpe:/a:oracle:linux:kernel-debug-devel, p-cpe:/a:oracle:linux:kernel-devel, p-cpe:/a:oracle:linux:kernel-doc, p-cpe:/a:oracle:linux:kernel-headers, p-cpe:/a:oracle:linux:kernel-tools, p-cpe:/a:oracle:linux:kernel-tools-libs, p-cpe:/a:oracle:linux:kernel-tools-libs-devel, p-cpe:/a:oracle:linux:perf, p-cpe:/a:oracle:linux:python-perf, cpe:/o:oracle:linux:7

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/22/2018

Vulnerability Publication Date: 5/22/2018

Reference Information

CVE: CVE-2018-3639

RHSA: 2018:1629