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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2446
                    USN-5013-1: systemd vulnerabilities
                               21 July 2021

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

Product:           systemd
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
                   Reduced Security  -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-33910 CVE-2020-13529 

Reference:         ESB-2021.2438

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5013-1
   https://ubuntu.com/security/notices/USN-5013-2

Comment: This bulletin contains two (2) Ubuntu security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-5013-1: systemd vulnerabilities
20 July 2021

Several security issues were fixed in systemd.
Releases

  o Ubuntu 21.04
  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS

Packages

  o systemd - system and service manager

Details

It was discovered that systemd incorrectly handled certain mount paths. A
local attacker could possibly use this issue to cause systemd to crash,
resulting in a denial of service. ( CVE-2021-33910 )

Mitchell Frank discovered that systemd incorrectly handled DHCP FORCERENEW
packets. A remote attacker could possibly use this issue to reconfigure
servers. ( CVE-2020-13529 )

Update instructions

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

Ubuntu 21.04

  o systemd - 247.3-3ubuntu3.4

Ubuntu 20.10

  o systemd - 246.6-1ubuntu1.7

Ubuntu 20.04

  o systemd - 245.4-4ubuntu3.10

Ubuntu 18.04

  o systemd - 237-3ubuntu10.49

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

References

  o CVE-2020-13529
  o CVE-2021-33910

Related notices

  o USN-5013-2 : libudev1-udeb, libnss-resolve, libsystemd-dev, libsystemd0,
    systemd-container, systemd, systemd-sysv, libudev-dev, systemd-coredump,
    libnss-mymachines, libnss-myhostname, libudev1, systemd-journal-remote,
    udev-udeb, libpam-systemd, udev

- --------------------------------------------------------------------------------

USN-5013-2: systemd vulnerabilities
20 July 2021

Several security issues were fixed in systemd.
Releases

  o Ubuntu 16.04 ESM

Packages

  o systemd - system and service manager

Details

USN-5013-1 fixed several vulnerabilities in systemd. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that systemd incorrectly handled certain mount paths. A
local attacker could possibly use this issue to cause systemd to crash,
resulting in a denial of service. ( CVE-2021-33910 )

Mitchell Frank discovered that systemd incorrectly handled DHCP FORCERENEW
packets. A remote attacker could possibly use this issue to reconfigure
servers. ( CVE-2020-13529 )

Update instructions

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

Ubuntu 16.04

  o systemd - 229-4ubuntu21.31+esm1
    Available with UA Infra or UA Desktop

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

References

  o CVE-2020-13529
  o CVE-2021-33910

Related notices

  o USN-5013-1 : systemd-journal-remote, udev-udeb, systemd-sysv, libudev-dev,
    libnss-mymachines, libudev1-udeb, libpam-systemd, libnss-systemd,
    libnss-myhostname, udev, systemd-coredump, libudev1, libsystemd0,
    systemd-timesyncd, systemd-tests, libsystemd-dev, libnss-resolve,
    systemd-container, systemd

- --------------------------END INCLUDED TEXT--------------------

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