A critical zero-day remote code execution vulnerability identified as CVE-2021-44228 was published through various sources this past week affecting many versions of Apache Log4j. There are growing numbers of active exploitations in the wild, and CISA is recommending that affected systems be patched to Apache Log4j 2.16 immediately to mitigate.
JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. This functionality has been completely removed from version 2.16.
More information on remediation can be found at https://tst.usgs.gov/security/log4j-remediation-resources/
