CWE-830: Inclusion of Web Functionality from an Untrusted Source
Learn about CWE-830 (Inclusion of Web Functionality from an Untrusted Source), its security impact, exploitation methods, and prevention guidelines.
What is Inclusion of Web Functionality from an Untrusted Source?
• Overview: This vulnerability occurs when a web application includes functionality from an external, untrusted source, such as web widgets or scripts from another domain. This inclusion runs within the application's domain, potentially granting the external source access to sensitive data and control over the application.
• Exploitation Methods:
- Attackers can exploit this by injecting malicious scripts that execute within the trusted domain's context.
- Common attack patterns include Cross-Site Scripting (XSS) and Man-in-the-Middle (MitM) attacks, where scripts are modified or intercepted during transmission.
• Security Impact:
- Direct consequences include unauthorized access to sensitive information like cookies, user data, and session identifiers.
- Potential cascading effects involve data breaches, unauthorized transactions, and compromised user accounts.
- Business impact could involve loss of customer trust, legal liabilities, and financial losses due to data breaches.
• Prevention Guidelines:
- Specific code-level fixes: Avoid including scripts from untrusted sources and validate third-party content before execution.
- Security best practices: Use Content Security Policy (CSP) to restrict the sources of executable scripts, and implement Subresource Integrity (SRI) to ensure that the fetched resources are delivered without unexpected manipulation.
- Recommended tools and frameworks: Utilize security-focused frameworks and libraries that offer built-in protections against unauthorized script inclusions. Implement regular security audits and code reviews to detect and mitigate such vulnerabilities.
Technical Details
Likelihood of Exploit: Not specified
Affected Languages: Not specified
Affected Technologies: Not specified