Ubuntu 20.10 USN-4713-1 High Severity: Data Access Risk Advisory

ubuntu

January 28, 2021

The system could allow unintended access to data in some environments.

Summary

The system could allow unintended access to data in some environments.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi (V8) systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems

Details:

It was discovered that the LIO SCSI target implementation in the Linux

kernel performed insufficient identifier checking in certain XCOPY

requests. An attacker with access to at least one LUN in a multiple

backstore environment could use this to expose sensitive information or

modify data.

Topics Covered

security advisory high severity access control update instructions ubuntu linux kernel data access cloud environments data access risk cloud systems

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  linux-image-5.8.0-1013-raspi    5.8.0-1013.16
  linux-image-5.8.0-1013-raspi-nolpae  5.8.0-1013.16
  linux-image-5.8.0-1016-kvm      5.8.0-1016.18
  linux-image-5.8.0-1018-oracle   5.8.0-1018.19
  linux-image-5.8.0-1020-azure    5.8.0-1020.22
  linux-image-5.8.0-1021-aws      5.8.0-1021.23
  linux-image-aws                 5.8.0.1021.23
  linux-image-azure               5.8.0.1020.20
  linux-image-kvm                 5.8.0.1016.18
  linux-image-oracle              5.8.0.1018.18
  linux-image-raspi               5.8.0.1013.16
  linux-image-raspi-nolpae        5.8.0.1013.16

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1032-kvm      5.4.0-1032.33
  linux-image-5.4.0-1036-gcp      5.4.0-1036.39
  linux-image-5.4.0-1037-aws      5.4.0-1037.39
  linux-image-5.4.0-1037-oracle   5.4.0-1037.40
  linux-image-5.4.0-1039-azure    5.4.0-1039.41
  linux-image-aws                 5.4.0.1037.38
  linux-image-azure               5.4.0.1039.37
  linux-image-gcp                 5.4.0.1036.45
  linux-image-kvm                 5.4.0.1032.30
  linux-image-oracle              5.4.0.1037.34

Ubuntu 18.04 LTS:
  linux-image-5.4.0-1037-aws      5.4.0-1037.39~18.04.1
  linux-image-aws                 5.4.0.1037.21

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.