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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

Packages

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.
Please see the following link for more information:
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Log4Shell

Update instructions

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

Ubuntu 21.10
Ubuntu 21.04
Ubuntu 20.04

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

References

Related notices

  • USN-5222-1: apache-log4j2, liblog4j2-java-doc, liblog4j2-java