CVE-2017-7674 : Exploit Details and Defense Strategies

Apache Tomcat CORS Filter vulnerability

Understanding CVE-2017-7674

Apache Tomcat versions 9.0.0.M1 to 9.0.0.M21, 8.5.0 to 8.5.15, 8.0.0.RC1 to 8.0.44, and 7.0.41 to 7.0.78 were affected by a CORS Filter vulnerability.

What is CVE-2017-7674?

The CORS Filter in Apache Tomcat failed to include an HTTP Vary header, potentially leading to cache poisoning on both client and server sides.

The Impact of CVE-2017-7674

The vulnerability could allow malicious actors to manipulate cache mechanisms, leading to security breaches and unauthorized access.

Technical Details of CVE-2017-7674

Vulnerability Description

The CORS Filter in affected Apache Tomcat versions did not properly handle the HTTP Vary header, enabling cache poisoning attacks.

Affected Systems and Versions

Apache Tomcat versions 9.0.0.M1 to 9.0.0.M21
Apache Tomcat versions 8.5.0 to 8.5.15
Apache Tomcat versions 8.0.0.RC1 to 8.0.44
Apache Tomcat versions 7.0.41 to 7.0.78

Exploitation Mechanism

Attackers could exploit this vulnerability to manipulate cache mechanisms, potentially leading to unauthorized access and security breaches.

Mitigation and Prevention

Immediate Steps to Take

Update Apache Tomcat to a non-vulnerable version
Implement proper input validation and output encoding
Monitor and restrict network access to vulnerable systems

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities
Conduct security assessments and penetration testing

Patching and Updates

Apply security patches provided by Apache Software Foundation
Stay informed about security advisories and updates from trusted sources