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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.

Priority

High

CVSS 3 base score: 3.7

Status

Package Release Status
apache-log4j2
Launchpad, Ubuntu, Debian
Upstream Needed

Ubuntu 21.10 (Impish Indri)
Released (2.16.0-0.21.10.1)
Ubuntu 21.04 (Hirsute Hippo)
Released (2.16.0-0.21.04.1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (2.16.0-0.20.04.1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(code not present)
Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(code not present)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist