========================================================================= Ubuntu Security Notice USN-5222-1 January 11, 2022 apache-log4j2 vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.10 - Ubuntu 21.04 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in Apache Log4j 2. Software Description: - apache-log4j2: Apache Log4j - Logging Framework for Java Details: It was discovered that Apache Log4j 2 was vulnerable to remote code execution (RCE) attack when configured to use a JDBC Appender with a JNDI LDAP data source URI. A remote attacker could possibly use this issue to cause a crash, leading to a denial of service. (CVE-2021-44832) 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. This issue only affected Ubuntu 18.04 LTS. (CVE-2021-45105) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 21.10: liblog4j2-java 2.17.1-0.21.10.1 Ubuntu 21.04: liblog4j2-java 2.17.1-0.21.04.1 Ubuntu 20.04 LTS: liblog4j2-java 2.17.1-0.20.04.1 Ubuntu 18.04 LTS: liblog4j2-java 2.12.4-0ubuntu0.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5222-1 CVE-2021-44832, CVE-2021-45105 Package Information: https://launchpad.net/ubuntu/+source/apache-log4j2/2.17.1-0.21.10.1 https://launchpad.net/ubuntu/+source/apache-log4j2/2.17.1-0.21.04.1 https://launchpad.net/ubuntu/+source/apache-log4j2/2.17.1-0.20.04.1 https://launchpad.net/ubuntu/+source/apache-log4j2/2.12.4-0ubuntu0.1