Apache Log4j2 CVE-2023-38545 RCE Analysis, POC and Remediation Guide

Vulnerability Summary: CVE-2023-38545 (Apache Log4j2 Remote Code Execution Vulnerability) Vulnerability Overview Apache Log4j2 versions 2.0 through 2.17.1 contain a Remote Code Execution (RCE) vulnerability. Attackers can trigger arbitrary code execution by crafting malicious log messages that exploit the JNDI injection feature. This vulnerability has widespread impact and is known as "Log4Shell," ranking as one of the most severe software vulnerabilities in recent years. Scope of Impact Affected Components: Apache Log4j2 2.0 – 2.17.1 Affected Products: - Apache Log4j2 itself - Java applications using Log4j2 (e.g., Spring Boot, Hadoop, Kafka, Elasticsearch, etc.) - Third-party libraries or frameworks that depend on Log4j2 and have not been upgraded Attack Vector: Triggering remote code execution by logging a malicious JNDI string (e.g., ). Remediation 1. Upgrade Log4j2 to version 2.17.1 or higher (Officially recommended) 2. Temporary Mitigation Measures (For environments where immediate upgrades are not possible): - Disable JNDI lookup functionality: - Or configure in the file: - Remove or isolate the class (via classloader isolation or by removing the JAR file) POC / Exploit Code (Complete Extraction) > Note: In actual attacks, the attacker controls the LDAP server to return a malicious class path, inducing the target JVM to load and execute remote code. Additional Notes This vulnerability was first disclosed in December 2021 and affects millions of systems worldwide. Official patches have been released; all users are advised to upgrade immediately. For systems that cannot be upgraded, the aforementioned mitigation measures must be implemented, and abnormal network behavior should be monitored. --- Source: Apache Log4j2 Official Advisory, NVD CVE-2023-38545, CNVD Vulnerability Database

Goal Reached Thanks to every supporter — we hit 100%!

Apache Log4j2 CVE-2023-38545 RCE Analysis, POC and Remediation Guide

More from this source