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Ubuntu 16.04 LTS USN-3732-2: Major Denial Of Service Threat Resolved

ubuntu
Calendar Grey August 6, 2018
Dist Ubuntu Esm H88
Critical improvements for Ubuntu to prevent service interruptions from malicious traffic. Confirm your system has the latest updates and is fortified.
The system could be made unavailable if it received specially craftednetwork traffic.

Summary

The system could be made unavailable if it received specially crafted

network traffic.

Software Description:

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

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

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3732-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu

16.04 LTS.

Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel

performed algorithmically expensive operations in some situations when

handling incoming packets. A remote attacker could use this to cause a

denial of service.

Topics%20covered

Topics Covered

security advisory denial of service security update ubuntu linux kernel network issue

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1015-gcp     4.15.0-1015.15~16.04.1
  linux-image-4.15.0-1019-azure   4.15.0-1019.19~16.04.1
  linux-image-4.15.0-30-generic   4.15.0-30.32~16.04.1
  linux-image-4.15.0-30-generic-lpae  4.15.0-30.32~16.04.1
  linux-image-4.15.0-30-lowlatency  4.15.0-30.32~16.04.1
  linux-image-azure               4.15.0.1019.25
  linux-image-gcp                 4.15.0.1015.27
  linux-image-generic-hwe-16.04   4.15.0.30.52
  linux-image-generic-lpae-hwe-16.04  4.15.0.30.52
  linux-image-gke                 4.15.0.1015.27
  linux-image-lowlatency-hwe-16.04  4.15.0.30.52

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-3732-2

https://ubuntu.com/security/notices/USN-3732-1

CVE-2018-5390

Severity
critical
Lowest
Low
Medium
High
Critical

August 06, 2018

Topics%20covered

Topics Covered

security advisory denial of service security update ubuntu linux kernel network issue

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1019.19~16.04.1
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1015.15~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-30.32~16.04.1

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