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Ubuntu Security Notice USN-3938-1
April 08, 2019

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

– Ubuntu 18.10
– Ubuntu 18.04 LTS
– Ubuntu 16.04 LTS
– Ubuntu 14.04 LTS

Summary:

The systemd PAM module could be used to gain additional PolicyKit
privileges.

Software Description:
– systemd: system and service manager

Details:

Jann Horn discovered that pam_systemd created logind sessions using some
parameters from the environment. A local attacker could exploit this in
order to spoof the active session and gain additional PolicyKit
privileges.

Update instructions:

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

Ubuntu 18.10:
  libpam-systemd                  239-7ubuntu10.12

Ubuntu 18.04 LTS:
  libpam-systemd                  237-3ubuntu10.19

Ubuntu 16.04 LTS:
  libpam-systemd                  229-4ubuntu21.21

Ubuntu 14.04 LTS:
  libpam-systemd                  204-5ubuntu20.31

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

References:
  https://usn.ubuntu.com/usn/usn-3938-1
  CVE-2019-3842

Package Information:
  https://launchpad.net/ubuntu/+source/systemd/239-7ubuntu10.12
  https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.19
  https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu21.21
  https://launchpad.net/ubuntu/+source/systemd/204-5ubuntu20.31

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