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Ubuntu Security Notice USN-4006-1

Ubuntu Security Notice USN-4006-1
Posted Jun 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4006-1 - Federico Manuel Bento discovered that the Linux kernel did not properly apply Address Space Layout Randomization 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.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-11191
MD5 | b8000ad921e00a66a82c649afbb85152

Ubuntu Security Notice USN-4006-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4006-1
June 04, 2019

linux, linux-aws, linux-gcp, linux-kvm, linux-raspi2 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10

Summary:

A system hardening measure could be bypassed.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

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.

Update instructions:

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

Ubuntu 18.10:
linux-image-4.18.0-1012-gcp 4.18.0-1012.13
linux-image-4.18.0-1013-kvm 4.18.0-1013.13
linux-image-4.18.0-1015-raspi2 4.18.0-1015.17
linux-image-4.18.0-1017-aws 4.18.0-1017.19
linux-image-4.18.0-21-generic 4.18.0-21.22
linux-image-4.18.0-21-generic-lpae 4.18.0-21.22
linux-image-4.18.0-21-lowlatency 4.18.0-21.22
linux-image-4.18.0-21-snapdragon 4.18.0-21.22
linux-image-aws 4.18.0.1017.17
linux-image-gcp 4.18.0.1012.12
linux-image-generic 4.18.0.21.22
linux-image-generic-lpae 4.18.0.21.22
linux-image-gke 4.18.0.1012.12
linux-image-kvm 4.18.0.1013.13
linux-image-lowlatency 4.18.0.21.22
linux-image-raspi2 4.18.0.1015.12
linux-image-snapdragon 4.18.0.21.22

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://usn.ubuntu.com/4006-1
CVE-2019-11191

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.18.0-21.22
https://launchpad.net/ubuntu/+source/linux-aws/4.18.0-1017.19
https://launchpad.net/ubuntu/+source/linux-gcp/4.18.0-1012.13
https://launchpad.net/ubuntu/+source/linux-kvm/4.18.0-1013.13
https://launchpad.net/ubuntu/+source/linux-raspi2/4.18.0-1015.17

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