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CVE-2021-45046

Published: 14 December 2021

It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.

Notes

AuthorNote
amurray
Ubuntu 18.04 LTS is not affected since the JndiLookup.class was removed in the previous update for CVE-2021-44228
ebarretto
above is also true for Ubuntu 16.04 ESM
Priority

High

CVSS 3 base score: 3.7

Status

Package Release Status
apache-log4j2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal
Released (2.16.0-0.20.04.1)
hirsute
Released (2.16.0-0.21.04.1)
impish
Released (2.16.0-0.21.10.1)
jammy Not vulnerable
(2.16.0-1)
trusty Does not exist

upstream Needed

xenial Not vulnerable
(code not present)