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Ubuntu 18.04 & 16.04 LTS USN-3777-3 Critical: linux-azure DoS Issues

ubuntu
Calendar Grey October 23, 2018
Dist Ubuntu Esm H88
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

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

Details:

USN-3777-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04

%LTS. This update provides the corresponding updates for the

Linux kernel for Azure Cloud systems.

Jann Horn discovered that the vmacache subsystem did not properly handle

sequence number overflows, leading to a use-after-free vulnerability. A

local attacker could use this to cause a denial of service (system crash)

or execute arbitrary code. (CVE-2018-17182)

It was discovered that the paravirtualization implementation in the Linux

kernel did not properly handle some indirect calls, reducing the

effectiveness of Spectre v2 mitigations for paravirtual guests. A local

attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and

prediction of return addresses via Return Stack B...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update memory leak ubuntu linux-azure

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1025-azure   4.15.0-1025.26
  linux-image-azure               4.15.0.1025.25

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1025-azure   4.15.0-1025.26~16.04.1
  linux-image-azure               4.15.0.1025.31

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-3777-3

https://ubuntu.com/security/notices/USN-3777-1

CVE-2017-5715, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594,

CVE-2018-17182, CVE-2018-3639, CVE-2018-6554, CVE-2018-6555

Severity
critical
Lowest
Low
Medium
High
Critical

October 23, 2018

Topics%20covered

Topics Covered

security advisory denial of service kernel update memory leak ubuntu linux-azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1025.26
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1025.26~16.04.1

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