tools-only Overview
This skill empowers Claude to assess the security and correctness of CORS policies. By leveraging the cors-policy-validator plugin, it identifies misconfigurations and potential vulnerabilities in CORS settings, helping developers build more secure web applications.
How It Works
- Analyze CORS Configuration: The skill receives the CORS configuration details, such as headers or policy files.
- Validate Policy: It utilizes the cors-policy-validator plugin to analyze the provided configuration against established security best practices.
- Report Findings: The skill presents a detailed report outlining any identified vulnerabilities or misconfigurations in the CORS policy.
When to Use This Skill
This skill activates when you need to:
- Validate a CORS policy for a web application.
- Check the CORS configuration of an API endpoint.
- Identify potential security vulnerabilities in existing CORS implementations.
Examples
Example 1: Validating a CORS Policy File
User request: "Validate the CORS policy in cors_policy.json"
The skill will:
- Read the
cors_policy.jsonfile. - Use the cors-policy-validator plugin to analyze the CORS configuration.
- Output a report detailing any identified vulnerabilities or misconfigurations.
Example 2: Checking CORS Headers for an API Endpoint
User request: "Check CORS headers for the API endpoint at https://example.com/api"
The skill will:
- Fetch the CORS headers from the specified API endpoint.
- Use the cors-policy-validator plugin to analyze the headers.
- Output a report summarizing the CORS configuration and any potential issues.
Best Practices
- Configuration Source: Always specify the source of the CORS configuration (e.g., file path, URL) for accurate validation.
- Regular Validation: Regularly validate CORS policies, especially after making changes to the application or API.
- Heuristic Analysis: Consider supplementing validation with manual review and heuristic analysis to catch subtle vulnerabilities.
Integration
This skill can be integrated with other security-related plugins to provide a more comprehensive security assessment. For example, it can be used in conjunction with vulnerability scanning tools to identify potential cross-site scripting (XSS) vulnerabilities related to CORS misconfigurations.