Ubuntu Security Notice 5197-1 - 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.
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Ubuntu Security Notice USN-5197-1
December 15, 2021
apache-log4j2 vulnerability
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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