Log4j Vulnerability (CVE-2021-44228)

Description

Apache Log4j2 versions up to 2.14.1 are vulnerable to JNDI injection attacks, which can execute arbitrary code via LDAP and other JNDI endpoints if log messages or parameters are attacker-controlled and message lookup substitution is enabled. This vulnerability has been mitigated in Log4j 2.15.0, where the JNDI features are disabled by default.

Recommendation

Upgrade Log4j2 to version 2.17.1 or newer to address JNDI injection vulnerabilities. For versions earlier than 2.17.1, mitigate the risk by setting the system property “log4j2.formatMsgNoLookups” to “true” or removing the JndiLookup class from the classpath. Additionally, Java 8u121 and later protect against remote code execution by defaulting “com.sun.jndi.rmi.object.trustURLCodebase” and “com.sun.jndi.cosnaming.object.trustURLCodebase” to “false”.

Written by

Anandhu Krishnan

Lead Engineer

Anandhu is an accomplished Senior Lead Engineer with a strong focus on back-end development. His expertise lies in architecting and optimizing the core of software applications to ensure they run smoothly and efficiently. With a meticulous attention to detail and a deep understanding of data management and server-side operations, Anandhu has been a driving force behind the success of various back-end projects.