Ubuntu 21.10 USN-5222-1: Apache Log4j 2 RCE and DoS Advisory

ubuntu

January 11, 2022

Several security issues were fixed in Apache Log4j 2.

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)

Topics Covered

security advisory denial of service security update remote code execution ubuntu apache-log4j2

Update Instructions

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

Ubuntu 21.10:
  liblog4j2-java                  2.17.1-0.21.10.1

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.