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Alerts This Week
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Ubuntu 16.04 LTS: USN-4303-1 Critical: Kernel Information Exposure

ubuntu
Calendar Grey March 16, 2020
Dist Ubuntu Esm H88
Debian Security Alert DSA-4589-1 describes a significant vulnerability in the web server software that may lead to unauthorized access under specific conditions.
The system could be made to expose sensitive information.

Summary

The system could be made to expose sensitive information.

Software Description:

- linux: Linux kernel

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

- linux-kvm: Linux kernel for cloud environments

Details:

Paulo Bonzini discovered that the KVM hypervisor implementation in the

Linux kernel could improperly let a nested (level 2) guest access the

resources of a parent (level 1) guest in certain situations. An attacker

could use this to expose sensitive information.

Topics%20covered

Topics Covered

security advisory kernel update instructions information exposure ubuntu linux-aws linux-kvm

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1068-kvm      4.4.0-1068.75
  linux-image-4.4.0-1104-aws      4.4.0-1104.115
  linux-image-4.4.0-176-generic   4.4.0-176.206
  linux-image-4.4.0-176-generic-lpae  4.4.0-176.206
  linux-image-4.4.0-176-lowlatency  4.4.0-176.206
  linux-image-4.4.0-176-powerpc-e500mc  4.4.0-176.206
  linux-image-4.4.0-176-powerpc-smp  4.4.0-176.206
  linux-image-4.4.0-176-powerpc64-emb  4.4.0-176.206
  linux-image-4.4.0-176-powerpc64-smp  4.4.0-176.206
  linux-image-aws                 4.4.0.1104.108
  linux-image-generic             4.4.0.176.184
  linux-image-generic-lpae        4.4.0.176.184
  linux-image-kvm                 4.4.0.1068.68
  linux-image-lowlatency          4.4.0.176.184
  linux-image-powerpc-e500mc      4.4.0.176.184
  linux-image-powerpc-smp         4.4.0.176.184
  linux-image-powerpc64-emb       4.4.0.176.184
  linux-image-powerpc64-smp       4.4.0.176.184
  linux-image-virtual             4.4.0.176.184

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.

References

https://ubuntu.com/security/notices/USN-4303-1

CVE-2020-2732

Severity
critical
Lowest
Low
Medium
High
Critical

March 17, 2020

Topics%20covered

Topics Covered

security advisory kernel update instructions information exposure ubuntu linux-aws linux-kvm

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-176.206
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1104.115
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1068.75

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