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             AUSCERT External Security Bulletin Redistribution

                               ESB-2022.0166
                     USN-5226-1: systemd vulnerability
                              13 January 2022

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

Product:           systemd
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Existing Account
                   Reduced Security  -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-3997  

Reference:         ESB-2022.0118

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5226-1

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USN-5226-1: systemd vulnerability
13 January 2022

systemd-tmpfiles could be made to crash or have other unspecified impacts.
Releases

  o Ubuntu 21.10
  o Ubuntu 21.04
  o Ubuntu 20.04 LTS

Packages

  o systemd - system and service manager

Details

It was discovered that systemd-tmpfiles employed uncontrolled recursion
when removing deeply nested directory hierarchies. A local attacker could
exploit this to cause systemd-tmpfiles to crash or have other unspecified
impacts.

Update instructions

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

Ubuntu 21.10

  o systemd - 248.3-1ubuntu8.2

Ubuntu 21.04

  o systemd - 247.3-3ubuntu3.7

Ubuntu 20.04

  o systemd - 245.4-4ubuntu3.15

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

References

  o CVE-2021-3997

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