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attack-surface.md

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Attack Surface Analysis for kevinzhow/pnchart

Attack Surface: DOM-Based Cross-Site Scripting (XSS)

  • Description: Injection of malicious JavaScript into the web page through pnchart's rendering process.
  • pnchart Contribution: pnchart renders charts in the browser's DOM. If it doesn't properly sanitize user-provided data (labels, tooltips, data values) before inserting it into the DOM, it creates an XSS vulnerability. This is the direct contribution.
  • Example:
    • An attacker provides a chart label containing <script>alert('XSS')</script>. If pnchart directly inserts this into the DOM without escaping, the script will execute.
    • A tooltip configured within pnchart to display user-provided data includes malicious JavaScript.
  • Impact:
    • Theft of user cookies and session tokens.
    • Redirection to malicious websites.
    • Defacement of the web page.
    • Execution of arbitrary code in the user's browser.
    • Keylogging and data theft.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Output Encoding/Escaping (Within pnchart): The primary mitigation is for pnchart itself to perform robust output encoding (HTML entity encoding) before inserting any data into the DOM. This is the library's responsibility. Developers integrating pnchart should verify this behavior through code review and testing.
    • Input Validation (Before pnchart): While pnchart should handle escaping, developers should also validate and sanitize data before passing it to pnchart as a defense-in-depth measure. Use a whitelist approach.
    • Content Security Policy (CSP): Implement a strict CSP. While this doesn't prevent the vulnerability within pnchart, it significantly limits the impact. Disallow unsafe-inline and unsafe-eval.
    • Regular Code Review (of pnchart): Examine the pnchart source code for how it handles data insertion into the DOM. Look for any areas where user-provided data is used without proper escaping.
    • Report Vulnerabilities: If a vulnerability is found in pnchart, report it responsibly to the maintainers.

Attack Surface: Unpatched Vulnerabilities in pnchart

  • Description: Known vulnerabilities in pnchart itself are not addressed, leaving the application exposed.
  • pnchart Contribution: This is a direct vulnerability of pnchart. The library itself contains the flawed code.
  • Example:
    • A published CVE (Common Vulnerabilities and Exposures) exists for a specific version of pnchart that allows for XSS or another critical vulnerability.
  • Impact: Varies depending on the specific vulnerability, but can range from data leakage to complete system compromise (if the vulnerability allows for arbitrary code execution).
  • Risk Severity: High (or Critical, depending on the vulnerability)
  • Mitigation Strategies:
    • Regular Dependency Scanning: Use tools like npm audit, yarn audit, or Snyk to specifically scan pnchart for known vulnerabilities.
    • Prompt Updates: Update pnchart to its latest secure version as soon as patches are available. This is the most direct mitigation.
    • Vulnerability Monitoring: Subscribe to security advisories and mailing lists related to pnchart to stay informed about new vulnerabilities.
    • Fork and Patch (if necessary): If the pnchart maintainers are unresponsive, consider forking the project and applying the necessary security patches yourself (and contributing them back to the community).