========================================================================== Ubuntu Security Notice USN-5197-1 December 15, 2021 apache-log4j2 vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.10 - Ubuntu 21.04 - Ubuntu 20.04 LTS Summary: Apache Log4j 2 could be made to crash if it received specially crafted input. Software Description: - apache-log4j2: Apache Log4j - Logging Framework for Java Details: It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. An attacker could use this vulnerability to cause a denial of service. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 21.10: liblog4j2-java 2.16.0-0.21.10.1 Ubuntu 21.04: liblog4j2-java 2.16.0-0.21.04.1 Ubuntu 20.04 LTS: liblog4j2-java 2.16.0-0.20.04.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5197-1 CVE-2021-44228, CVE-2021-45046 Package Information: https://launchpad.net/ubuntu/+source/apache-log4j2/2.16.0-0.21.10.1 https://launchpad.net/ubuntu/+source/apache-log4j2/2.16.0-0.21.04.1 https://launchpad.net/ubuntu/+source/apache-log4j2/2.16.0-0.20.04.1