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Ubuntu Security Notice USN-4008-2

Ubuntu Security Notice USN-4008-2
Posted Jun 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4008-2 - USN-4008-1 fixed multiple security issues in the Linux kernel. This update provides the corresponding changes to AppArmor policy for correctly operating under the Linux kernel with fixes for CVE-2019-11190. Without these changes, some profile transitions may be unintentionally denied due to missing mmap rules. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2019-11190, CVE-2019-11191, CVE-2019-11810, CVE-2019-11815
MD5 | c8882ea2860369fb404f12edb2a0d011

Ubuntu Security Notice USN-4008-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4008-2
June 05, 2019

apparmor update
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several policy updates were made for running under the recently updated
Linux kernel.

Software Description:
- apparmor: Linux security system

Details:

USN-4008-1 fixed multiple security issues in the Linux kernel. This
update
provides the corresponding changes to AppArmor policy for correctly
operating under the Linux kernel with fixes for CVE-2019-11190. Without
these changes, some profile transitions may be unintentionally denied
due
to missing mmap ('m') rules.

Original advisory 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:
apparmor-profiles 2.10.95-0ubuntu2.11
python3-apparmor 2.10.95-0ubuntu2.11

In general, a standard system update will make all the necessary
changes.

References:
https://usn.ubuntu.com/4008-2
https://usn.ubuntu.com/4008-1
CVE-2019-11190

Package Information:
https://launchpad.net/ubuntu/+source/apparmor/2.10.95-0ubuntu2.11

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