Apache Struts is an open-source framework that is used to develop Java web applications. It follows the Model-View-Controller (MVC) architectural pattern and provides a set of reusable components and tools that simplify the development process. The framework is widely popular among Java developers due to its flexibility and ease of use.
CVE-2019-0230 is a vulnerability that was recently detected in Apache Struts. This security flaw exists in versions 2.0.0 to 2.5.20 and can be exploited to execute malicious code remotely. The root cause of the vulnerability lies in how the framework handles user input in tag attributes, allowing for double evaluation of the Object-Graph Navigation Language (OGNL) expression.
If exploited, this vulnerability can lead to various security issues, such as unauthorized access to sensitive data, remote code execution, and system hijacking. Attackers can take advantage of the vulnerability to execute their own code on the server. This can result in the attacker gaining full control of the system, stealing confidential information, modifying data, or even installing malware.
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REFERENCES
- http://packetstormsecurity.com/files/160108/Apache-Struts-2.5.20-Double-OGNL-Evaluation.html
- http://packetstormsecurity.com/files/160721/Apache-Struts-2-Forced-Multi-OGNL-Evaluation.html
- https://cwiki.apache.org/confluence/display/ww/s2-059
- https://launchpad.support.sap.com/#/notes/2982840
- https://lists.apache.org/thread.html/r1125f3044a0946d1e7e6f125a6170b58d413ebd4a95157e4608041c7@%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/r90890afea72a9571d666820b2fe5942a0a5f86be406fa31da3dd0922@%3Cannounce.apache.org%3E
- https://www.oracle.com/security-alerts/cpujan2021.html
To protect against this vulnerability, it is crucial to follow the best practices for securing web applications. Some of the key precautions that can be taken include: - Keep the Apache Struts framework up to date with the latest security patches
- Monitor the application for any suspicious activity
- Use trusted input validation mechanisms to prevent malicious input from reaching the server
- Implement strict access control measures to limit the privileges of users and roles
- Deploy a robust web application firewall to block known attacks
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