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Ubuntu Security Notice USN-4008-1

Ubuntu Security Notice USN-4008-1
Posted Jun 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4008-1 - Robert Swiecki discovered that the Linux kernel did not properly apply Address Space Layout Randomization in some situations for setuid elf binaries. A local attacker could use this to improve the chances of exploiting an existing vulnerability in a setuid elf binary. It was discovered that a null pointer dereference vulnerability existed in the LSI Logic MegaRAID driver in the Linux kernel. A local attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-11190, CVE-2019-11191, CVE-2019-11810, CVE-2019-11815
MD5 | d990ef004d827d7c662f4a3b15d04b52

Ubuntu Security Notice USN-4008-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4008-1
June 04, 2019

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Robert Święcki discovered that the Linux kernel did not properly apply
Address Space Layout Randomization (ASLR) in some situations for setuid elf
binaries. A local attacker could use this to improve the chances of
exploiting an existing vulnerability in a setuid elf binary.
(CVE-2019-11190)

It was discovered that a null pointer dereference vulnerability existed in
the LSI Logic MegaRAID driver in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash). (CVE-2019-11810)

It was discovered that a race condition leading to a use-after-free existed
in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11815)

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.
(CVE-2019-11191)

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 16.04 LTS:
linux-image-4.4.0-1047-kvm 4.4.0-1047.53
linux-image-4.4.0-1084-aws 4.4.0-1084.94
linux-image-4.4.0-1110-raspi2 4.4.0-1110.118
linux-image-4.4.0-1114-snapdragon 4.4.0-1114.119
linux-image-4.4.0-150-generic 4.4.0-150.176
linux-image-4.4.0-150-generic-lpae 4.4.0-150.176
linux-image-4.4.0-150-lowlatency 4.4.0-150.176
linux-image-4.4.0-150-powerpc-e500mc 4.4.0-150.176
linux-image-4.4.0-150-powerpc-smp 4.4.0-150.176
linux-image-4.4.0-150-powerpc64-emb 4.4.0-150.176
linux-image-4.4.0-150-powerpc64-smp 4.4.0-150.176
linux-image-aws 4.4.0.1084.87
linux-image-generic 4.4.0.150.158
linux-image-generic-lpae 4.4.0.150.158
linux-image-kvm 4.4.0.1047.47
linux-image-lowlatency 4.4.0.150.158
linux-image-powerpc-e500mc 4.4.0.150.158
linux-image-powerpc-smp 4.4.0.150.158
linux-image-powerpc64-emb 4.4.0.150.158
linux-image-powerpc64-smp 4.4.0.150.158
linux-image-raspi2 4.4.0.1110.110
linux-image-snapdragon 4.4.0.1114.106
linux-image-virtual 4.4.0.150.158

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/4008-1
CVE-2019-11190, CVE-2019-11191, CVE-2019-11810, CVE-2019-11815

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-150.176
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1084.94
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1047.53
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1110.118
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1114.119

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