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Vulnerability of Linux kernel: privilege escalation via efivar_ssdt_load

Synthesis of the vulnerability 

An attacker can bypass restrictions via efivar_ssdt_load of the Linux kernel, in order to escalate his privileges.
Impacted systems: Fedora, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 2/4.
Creation date: 14/07/2020.
Références of this alert: CERTFR-2020-AVI-460, CERTFR-2020-AVI-466, CERTFR-2020-AVI-474, CERTFR-2020-AVI-483, CERTFR-2020-AVI-547, CVE-2019-20908, FEDORA-2020-3be4990c1d, FEDORA-2020-3c3d1d7006, openSUSE-SU-2020:1153-1, RHSA-2020:3218-01, RHSA-2020:3219-01, RHSA-2020:3222-01, RHSA-2020:3228-01, SUSE-SU-2020:2103-1, SUSE-SU-2020:2106-1, SUSE-SU-2020:2107-1, SUSE-SU-2020:2119-1, SUSE-SU-2020:2121-1, SUSE-SU-2020:2122-1, SUSE-SU-2020:2478-1, SUSE-SU-2020:2487-1, USN-4426-1, USN-4427-1, USN-4439-1, USN-4440-1, VIGILANCE-VUL-32801.

Description of the vulnerability 

An attacker can bypass restrictions via efivar_ssdt_load of the Linux kernel, in order to escalate his privileges.
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This security weakness impacts software or systems such as Fedora, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this threat bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this threat.

Solutions for this threat 

Linux kernel: patch for efivar_ssdt_load.
A patch is indicated in information sources.

Fedora 31: new kernel packages.
New packages are available:
  Fedora 31: kernel 5.7.8-100.fc31

Fedora 32: new kernel packages.
New packages are available:
  Fedora 32: kernel 5.7.8-200.fc32

openSUSE Leap 15.1: new kernel packages (07/08/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.59.1

RHEL 8.0: new kernel packages.
New packages are available:
  RHEL 8.0: kernel 4.18.0-80.27.2.el8_0

RHEL 8.1: new kernel packages.
New packages are available:
  RHEL 8.1: kernel 4.18.0-147.24.2.el8_1

RHEL 8.2: new kernel packages.
New packages are available:
  RHEL 8.2: kernel 4.18.0-193.14.3.el8_2

RHEL 8.2: new kernel-rt packages.
New packages are available:
  RHEL 8.2: kernel-rt 4.18.0-193.14.3.rt13.67.el8_2

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.57.1

SUSE LE 12 SP5: new kernel-azure packages (05/08/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.22.1

SUSE LE 12 SP5: new kernel packages (05/08/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.29.1

SUSE LE 12 SP5: new kernel-rt packages (03/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.13.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.55.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.38.1

SUSE LE 15 SP1: new kernel packages (04/08/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.48.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.28.1

Ubuntu 18.0: new linux-image-5.0.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gke-5.0 5.0.0.1045.30

Ubuntu 18.0: new linux-image-5.3.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.3.0.1032.26

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-aws-hwe 4.15.0.1079.76
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.112.100

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.186.163
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.186.192
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