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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0432
                    USN-4269-1: systemd vulnerabilities
                              6 February 2020

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

Product:           systemd
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Increased Privileges            -- Existing Account
                   Denial of Service               -- Existing Account
                   Access Confidential Data        -- Existing Account
                   Reduced Security                -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-1712 CVE-2019-20386 CVE-2019-3844
                   CVE-2019-3843 CVE-2018-16888 

Reference:         ESB-2019.2969
                   ESB-2019.2621
                   ESB-2019.1918

Original Bulletin: 
   https://usn.ubuntu.com/4269-1/

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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USN-4269-1: systemd vulnerabilities
5 February 2020

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

  o Ubuntu 19.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Summary

Several security issues were fixed in systemd.

Software Description

  o systemd - system and service manager

Details

It was discovered that systemd incorrectly handled certain PIDFile files. A
local attacker could possibly use this issue to trick systemd into killing
privileged processes. This issue only affected Ubuntu 16.04 LTS.
(CVE-2018-16888)

It was discovered that systemd incorrectly handled certain udevadm trigger
commands. A local attacker could possibly use this issue to cause systemd to
consume resources, leading to a denial of service. (CVE-2019-20386)

Jann Horn discovered that systemd incorrectly handled services that use the
DynamicUser property. A local attacker could possibly use this issue to access
resources owned by a different service in the future. This issue only affected
Ubuntu 18.04 LTS. (CVE-2019-3843, CVE-2019-3844)

Tavis Ormandy discovered that systemd incorrectly handled certain Polkit
queries. A local attacker could use this issue to cause systemd to crash,
resulting in a denial of service, or possibly execute arbitrary code and
escalate privileges. (CVE-2020-1712)

Update instructions

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

Ubuntu 19.10
    systemd - 242-7ubuntu3.6
Ubuntu 18.04 LTS
    systemd - 237-3ubuntu10.38
Ubuntu 16.04 LTS
    systemd - 229-4ubuntu21.27

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

After a standard system update you need to reboot your computer to make all the
necessary changes.

References

  o CVE-2018-16888
  o CVE-2019-20386
  o CVE-2019-3843
  o CVE-2019-3844
  o CVE-2020-1712

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