USN-5192-1: Apache Log4j 2 vulnerability

Publication date

14 December 2021

Overview

Apache Log4j 2 could be made to crash or run programs as an administrator if it received a specially crafted input.


Packages

Details

Chen Zhaojun discovered that Apache Log4j 2 allows remote attackers to run
programs via a special crafted input. An attacker could use this vulnerability
to cause a denial of service or possibly execute arbitrary code.
Please see the following link for more information:
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Log4Shell

Chen Zhaojun discovered that Apache Log4j 2 allows remote attackers to run
programs via a special crafted input. An attacker could use this vulnerability
to cause a denial of service or possibly execute arbitrary code.
Please see the following link for more information:
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Log4Shell

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
21.10 impish liblog4j2-java –  2.15.0-0.21.10.1
21.04 hirsute liblog4j2-java –  2.15.0-0.21.04.1
20.04 focal liblog4j2-java –  2.15.0-0.20.04.1
18.04 bionic liblog4j2-java –  2.10.0-2ubuntu0.1

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