Apache Shiro Deserialization RCE (CVE-2016-4437) Analysis and POC

Summary of Critical Vulnerability Information Vulnerability Overview Vulnerability Name: Apache Shiro Deserialization Vulnerability (CVE-2016-4437) Vulnerability Type: Deserialization Vulnerability Vulnerability Description: Apache Shiro fails to sufficiently validate input data during the deserialization process. Attackers can construct malicious serialized data, leading to remote code execution. Affected Components: Apache Shiro version 1.2.4 and earlier Vulnerability Mechanism: Attackers forge serialized data within the RememberMe feature, leveraging the Java deserialization mechanism to trigger arbitrary code execution. Scope of Impact Affected Products: - Apache Shiro version 1.2.4 and earlier - Web applications utilizing Shiro (e.g., authentication systems based on Shiro) Affected Environments: - Java environments (JDK 6+) - Server-side applications with Shiro deployed Risk Level: High (CVSS Score 9.8) Remediation Plan Official Patch Version: Upgrade to Apache Shiro 1.2.5 or higher Temporary Mitigation Measures: - Disable the RememberMe feature - Filter Cookies containing at the firewall layer - Restrict the deserialization whitelist (allow only trusted classes) Configuration Recommendations: - Enable Shiro's encryption signature feature (using configuration) - Regularly update dependent libraries and monitor security advisories POC Code (Full Extraction) > Note: Actual exploitation requires consideration of the specific Shiro version and configuration; the code above is a simplified example. Real-world attacks require more complex gadget chains (such as CommonsCollections). Other Critical Information Vulnerability Discovery Date: October 2016 Public Disclosure Date: November 2016 Related CVE: CVE-2016-4437 Reference Links: - Apache Shiro Official Advisory - NVD Vulnerability Details --- It is recommended to immediately upgrade Shiro to version 1.2.5+ and implement the aforementioned mitigation measures.

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Apache Shiro Deserialization RCE (CVE-2016-4437) Analysis and POC

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