==========================================================================
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