An Apache Log4j security update has been released for Ubuntu Linux 16.04 ESM, 18.04 LTS, and 20.04 LTS.

USN-5998-1: Apache Log4j vulnerabilities

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Ubuntu Security Notice USN-5998-1
April 05, 2023

apache-log4j1.2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in Apache Log4j.

Software Description:
- apache-log4j1.2: Java-based open-source logging tool

Details:

It was discovered that the SocketServer component of Apache Log4j 1.2
incorrectly handled deserialization. An attacker could possibly use this issue
to execute arbitrary code. This issue only affected Ubuntu 16.04 ESM.
(CVE-2019-17571)

It was discovered that the JMSSink component of Apache Log4j 1.2 incorrectly
handled deserialization. An attacker could possibly use this issue to execute
arbitrary code. (CVE-2022-23302)

It was discovered that Apache Log4j 1.2 incorrectly handled certain SQL
statements. A remote attacker could possibly use this issue to perform an SQL
injection attack and alter the database. This issue was only fixed in Ubuntu
18.04 LTS and Ubuntu 20.04 LTS. (CVE-2022-23305)

It was discovered that the Chainsaw component of Apache Log4j 1.2 incorrectly
handled deserialization. An attacker could possibly use this issue to execute
arbitrary code. This issue was only fixed in Ubuntu 18.04 LTS and Ubuntu 20.04
LTS. (CVE-2022-23307)

Update instructions:

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

Ubuntu 20.04 LTS:
liblog4j1.2-java 1.2.17-9ubuntu0.2

Ubuntu 18.04 LTS:
liblog4j1.2-java 1.2.17-8+deb10u1ubuntu0.2

Ubuntu 16.04 ESM:
liblog4j1.2-java 1.2.17-7ubuntu1+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5998-1
CVE-2019-17571, CVE-2022-23302, CVE-2022-23305, CVE-2022-23307

Package Information:
  https://launchpad.net/ubuntu/+source/apache-log4j1.2/1.2.17-9ubuntu0.2
  https://launchpad.net/ubuntu/+source/apache-log4j1.2/1.2.17-8+deb10u1ubuntu0.2j