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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.4309
                 USN-5203-1: Apache Log4j 2 vulnerability
                             20 December 2021

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

Product:           apache-log4j2
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-45105  

Reference:         ASB-2021.0244.5

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5203-1

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USN-5203-1: Apache Log4j 2 vulnerability
19 December 2021

Apache Log4j 2 could be made to crash if it received specially crafted
input.
Releases

  o Ubuntu 21.10
  o Ubuntu 21.04
  o Ubuntu 20.04 LTS

Packages

  o apache-log4j2 - Apache Log4j - Logging Framework for Java

Details

Hideki Okamoto and Guy Lederfein discovered that Apache Log4j 2 did not
protect against infinite recursion in lookup evaluation. A remote attacker
could possibly use this issue to cause Apache Log4j 2 to crash, leading to
a denial of service.

Update instructions

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

Ubuntu 21.10

  o liblog4j2-java - 2.17.0-0.21.10.1

Ubuntu 21.04

  o liblog4j2-java - 2.17.0-0.21.04.1

Ubuntu 20.04

  o liblog4j2-java - 2.17.0-0.20.04.1

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

References

  o CVE-2021-45105

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