USN-5222-1: Apache Log4j 2 vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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

• liblog4j2-java - 2.17.1-0.20.04.1

Ubuntu 18.04

• liblog4j2-java - 2.12.4-0ubuntu0.1

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

References

• CVE-2021-44832
• CVE-2021-45105

Related notices

• USN-5203-1: liblog4j2-java-doc, apache-log4j2, liblog4j2-java