Apache Struts Multiple Vulnerabilities

Overview

Apache Struts is an open-source framework for developing Java EE web applications. Over the years, it has had several security vulnerabilities that could allow remote code execution, denial of service, or information disclosure if exploited.

• Severity: Critical

Impact

• Remote Code Execution (RCE): Attackers can execute arbitrary code on the server or client-side, potentially taking full control of affected systems.
• Denial of Service (DoS): Certain vulnerabilities can be exploited to make the application or server unresponsive, effectively denying service to legitimate users.
• Information Disclosure: Exploits may allow unauthorized access to sensitive data, which can lead to further security breaches.

Cause

• Inadequate Input Validation: Many vulnerabilities in Struts arise from the framework not properly sanitizing inputs that are used in critical processing.
• Outdated Libraries: Utilizing older, unpatched versions of Struts or its dependencies that contain known vulnerabilities.
• Misconfiguration: Incorrectly configured Struts settings can expose applications to higher risks of attacks.

Solution

Strategies for Mitigating Struts Vulnerabilities:

1. Regular Updates and Patch Management:
   • Always keep Apache Struts and its dependencies up to date. Regularly check for and apply security patches as soon as they are released.
2. Enhanced Input Validation:
   • Implement rigorous input validation and sanitization processes to prevent malicious data from affecting the application logic.
3. Security Audits and Testing:
   • Conduct regular security audits and penetration testing to identify and remediate potential vulnerabilities.
4. Isolate Struts Applications:
   • Run applications that use Struts in isolated environments to limit the impact of a potential breach.

Examples of Specific Struts Vulnerabilities Addressed:

• Apache Struts 2.5.0 < 2.5.33 / 6.0.0 < 6.3.0.2 Remote Code Execution (S2-066)
• Apache Struts 2.0.0 < 6.1.2.1 Denial of Service (S2-063)

References

• Apache Struts Security Bulletins
• Apache Struts Security

Additional Resources

N/A