USN-3938-1: systemd vulnerability

USN-3938-1: systemd vulnerability

systemd vulnerability

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

• CVE-2019-3842

Source: USN-3938-1: systemd vulnerability