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Attack Surface Analysis for zenorocha/clipboard.js

Attack Surface: Malicious Content Injection (Clipboard Hijacking - Write)

  • Description: An attacker injects malicious content into the user's clipboard through the application's use of clipboard.js. This occurs when the application doesn't properly sanitize user-supplied data before passing it to the library.
  • How clipboard.js Contributes: clipboard.js provides the mechanism for writing to the clipboard. The vulnerability lies in the application's failure to sanitize the data before using clipboard.js.
  • Example:
    • A user enters javascript:alert('XSS') into a form field that is then copied to the clipboard using clipboard.js. When the user pastes this into a browser address bar, the JavaScript code executes.
    • A user enters rm -rf /* into a field intended for a filename, and the application copies this to the clipboard. If pasted into a terminal, this could delete files.
  • Impact:
    • Code Execution: Execution of arbitrary JavaScript (XSS), shell commands, or other code in the context of the user's browser or system.
    • Phishing: Redirection to malicious websites.
    • Data Loss/Corruption: Deletion or modification of user data (if pasted into a terminal or other sensitive context).
  • Risk Severity: Critical (for code execution scenarios) to High (for phishing/data loss).
  • Mitigation Strategies:
    • Input Validation: Strictly validate all user input before passing it to clipboard.js. Use allow-lists (whitelists) whenever possible, specifying exactly what characters and formats are permitted.
    • Output Encoding: Encode the data appropriately for the intended context. Use HTML encoding, URL encoding, or other relevant encoding schemes to prevent malicious code from being interpreted as executable.
    • Context-Aware Sanitization: Understand where the user is likely to paste the data and sanitize accordingly. For example, if the data is intended for a URL, use URL encoding. If it's intended for display within HTML, use HTML encoding.
    • Content Security Policy (CSP): Use CSP to restrict the types of content that can be executed in the browser, mitigating the impact of XSS attacks.
    • Limit Data Size: Implement limits on the size of the data that can be copied to the clipboard to prevent denial-of-service attacks.
    • User Confirmation (Optional): For high-risk scenarios, consider adding a user confirmation step (e.g., a modal dialog) before copying sensitive data to the clipboard.

Attack Surface: Dependency-Related Vulnerabilities (Outdated Library)

  • Description: Using an outdated version of clipboard.js that contains known vulnerabilities.
  • How clipboard.js Contributes: The vulnerability exists within the outdated version of clipboard.js itself.
  • Example: A hypothetical vulnerability is discovered in clipboard.js version 1.0 that allows an attacker to bypass certain security checks. An application using version 1.0 is vulnerable, while an application using the patched version 1.1 is not.
  • Impact: Varies depending on the specific vulnerability. Could lead to malicious content injection.
  • Risk Severity: Varies depending on the vulnerability, but can be Critical to High.
  • Mitigation Strategies:
    • Regular Updates: Keep clipboard.js updated to the latest version. Use dependency management tools (e.g., npm, yarn) to track and manage dependencies.
    • Vulnerability Scanning: Use software composition analysis (SCA) tools to scan for known vulnerabilities in dependencies.
    • Security Advisories: Monitor security advisories and mailing lists related to clipboard.js and its dependencies.