Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : intel-microcode vulnerabilities (USN-3756-1) (Foreshadow) (Spectre)

Medium Nessus Plugin ID 112151


The remote Ubuntu host is missing a security-related patch.


It was discovered that memory present in the L1 data cache of an Intel
CPU core may be exposed to a malicious process that is executing on
the CPU core. This vulnerability is also known as L1 Terminal Fault
(L1TF). A local attacker in a guest virtual machine could use this to
expose sensitive information (memory from other guests or the host
OS). (CVE-2018-3646)

Jann Horn and Ken Johnson discovered that microprocessors utilizing
speculative execution of a memory read may allow unauthorized memory
reads via a sidechannel attack. This flaw is known as Spectre Variant
4. A local attacker could use this to expose sensitive information,
including kernel memory. (CVE-2018-3639)

Zdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy
discovered that microprocessors that perform speculative reads of
system registers may allow unauthorized disclosure of system
parameters via a sidechannel attack. This vulnerability is also known
as Rogue System Register Read (RSRE). An attacker could use this to
expose sensitive information. (CVE-2018-3640).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.


Update the affected intel-microcode package.

See Also


Plugin Details

Severity: Medium

ID: 112151

File Name: ubuntu_USN-3756-1.nasl

Version: 1.3

Type: local

Agent: unix

Published: 2018/08/28

Modified: 2018/12/01

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: 5.6

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:intel-microcode, cpe:/o:canonical:ubuntu_linux:14.04, cpe:/o:canonical:ubuntu_linux:16.04, cpe:/o:canonical:ubuntu_linux:18.04:-:lts

Patch Publication Date: 2018/08/27

Reference Information

CVE: CVE-2018-3639, CVE-2018-3640, CVE-2018-3646

USN: 3756-1