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Ubuntu 16.04 LTS: USN-4007-2 Critical: Linux Kernel ASLR Bypass

ubuntu
Calendar Grey June 4, 2019
Dist Ubuntu Esm H88
Ubuntu 16.04 LTS advisory covering kernel hardening and necessary updates for critical security issues.
A system hardening measure could be bypassed.

Summary

A system hardening measure could be bypassed.

Software Description:

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

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

- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

USN-4007-1 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.

Federico Manuel Bento discovered that the Linux kernel did not properly

apply Address Space Layout Randomization (ASLR) in some situations for

setuid a.out binaries. A local attacker could use this to improve the

chances of exploiting an existing vulnerability in a setuid a.out binary.

As a hardening measure, this update disables a.out support.

Topics%20covered

Topics Covered

security advisory hardening kernel ubuntu setuid linux-aws-hwe

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1014-oracle  4.15.0-1014.16~16.04.1
  linux-image-4.15.0-1040-aws     4.15.0-1040.42~16.04.1
  linux-image-4.15.0-51-generic   4.15.0-51.55~16.04.1
  linux-image-4.15.0-51-generic-lpae  4.15.0-51.55~16.04.1
  linux-image-4.15.0-51-lowlatency  4.15.0-51.55~16.04.1
  linux-image-aws-hwe             4.15.0.1040.40
  linux-image-generic-hwe-16.04   4.15.0.51.72
  linux-image-generic-lpae-hwe-16.04  4.15.0.51.72
  linux-image-lowlatency-hwe-16.04  4.15.0.51.72
  linux-image-oem                 4.15.0.51.72
  linux-image-oracle              4.15.0.1014.8
  linux-image-virtual-hwe-16.04   4.15.0.51.72

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-4007-2

https://ubuntu.com/security/notices/USN-4007-1

CVE-2019-11191

Severity
critical
Lowest
Low
Medium
High
Critical

June 04, 2019

Topics%20covered

Topics Covered

security advisory hardening kernel ubuntu setuid linux-aws-hwe

Package Information

https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1040.42~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-51.55~16.04.1
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1014.16~16.04.1

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