ESB-2019.1185 - [Linux][Ubuntu] systemd: Increased privileges - Existing account 2019-04-09

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1185
                           systemd vulnerability
                               9 April 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           systemd
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-3842  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3938-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running systemd check for an updated version of the software for 
         their operating system.

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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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