Debian DSA-4444-1 : linux - security update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)

medium Nessus Plugin ID 125095

Synopsis

The remote Debian host is missing a security-related update.

Description

Multiple researchers have discovered vulnerabilities in the way the Intel processor designs have implemented speculative forwarding of data filled into temporary microarchitectural structures (buffers).
This flaw could allow an attacker controlling an unprivileged process to read sensitive information, including from the kernel and all other processes running on the system or cross guest/host boundaries to read host memory.

See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.htmlfor more details.

To fully resolve these vulnerabilities it is also necessary to install updated CPU microcode. An updated intel-microcode package (only available in Debian non-free) will be provided via a separate DSA. The updated CPU microcode may also be available as part of a system firmware ('BIOS') update.

In addition, this update includes a fix for a regression causing deadlocks inside the loopback driver, which was introduced by the update to 4.9.168 in the last Stretch point release.

Solution

Upgrade the linux packages.

For the stable distribution (stretch), these problems have been fixed in version 4.9.168-1+deb9u2.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=928125

https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html

https://security-tracker.debian.org/tracker/source-package/linux

https://packages.debian.org/source/stretch/linux

https://www.debian.org/security/2019/dsa-4444

Plugin Details

Severity: Medium

ID: 125095

File Name: debian_DSA-4444.nasl

Version: 1.4

Type: local

Agent: unix

Published: 5/15/2019

Updated: 1/17/2020

Supported Sensors: Frictionless Assessment Agent, Nessus Agent

Risk Information

VPR

Risk Factor: High

Score: 7.1

CVSS v2

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 3.5

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

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

CVSS Score Source: CVE-2019-11091

CVSS v3

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.9

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:linux, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 5/14/2019

Vulnerability Publication Date: 5/30/2019

Reference Information

CVE: CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2019-11091

DSA: 4444