exploit the possibilities

Ubuntu Security Notice USN-3938-1

Ubuntu Security Notice USN-3938-1
Posted Apr 9, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3938-1 - 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.

tags | advisory, local, spoof
systems | linux, ubuntu
advisories | CVE-2019-3842
MD5 | 1ea66e9f11b68b91474bff6257eec73d

Ubuntu Security Notice USN-3938-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3938-1
April 08, 2019

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

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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