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Ubuntu 5203-1: Apache Log4j 2 DoS Threat Overview and Fix

ubuntu
Calendar Grey December 19, 2021
Dist Ubuntu Esm H88
Addressing Apache Log4j 2 security flaws on Ubuntu to avert possible Denial of Service threats
Apache Log4j 2 could be made to crash if it received specially crafted input.

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:

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.

Topics%20covered

Topics Covered

security advisory denial of service security issue software update Ubuntu DoS threat apache-log4j2

Update Instructions

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

Ubuntu 21.10:
  liblog4j2-java                  2.17.0-0.21.10.1

Ubuntu 21.04:
  liblog4j2-java                  2.17.0-0.21.04.1

Ubuntu 20.04 LTS:
  liblog4j2-java                  2.17.0-0.20.04.1

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

References

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

CVE-2021-45105

Severity
critical
Lowest
Low
Medium
High
Critical

December 19, 2021

Topics%20covered

Topics Covered

security advisory denial of service security issue software update Ubuntu DoS threat apache-log4j2

Package Information

https://launchpad.net/ubuntu/+source/apache-log4j2/2.17.0-0.21.10.1
https://launchpad.net/ubuntu/+source/apache-log4j2/2.17.0-0.21.04.1
https://launchpad.net/ubuntu/+source/apache-log4j2/2.17.0-0.20.04.1

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