Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : intel-microcode regression (USN-3531-2) (Spectre)

Medium Nessus Plugin ID 106264

Synopsis

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

Description

USN-3531-1 updated Intel microcode to the 20180108 release.
Regressions were discovered in the microcode updates which could cause system instability on certain hardware platforms. At the request of Intel, we have reverted to the previous packaged microcode version, the 20170707 release.

It was discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2017-5715)

This update provides the microcode updates required for the corresponding Linux kernel updates.

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.

Solution

Update the affected intel-microcode package.

See Also

https://usn.ubuntu.com/3531-2/

Plugin Details

Severity: Medium

ID: 106264

File Name: ubuntu_USN-3531-2.nasl

Version: 3.6

Type: local

Agent: unix

Published: 2018/01/23

Updated: 2018/12/01

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.7

Temporal Score: 3.7

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

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

Base Score: 5.6

Temporal Score: 5.1

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

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:17.10

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2018/01/22

Reference Information

CVE: CVE-2017-5715

USN: 3531-2

IAVA: 2018-A-0020