Security researchers have demonstrated a practical method to bypass nonce-based Content Security Policy by combining CSS injection, nonce leakage, and browser cache manipulation. This highlights vulnerabilities in web application security and emphasizes the importance of holistic protective measures. #ContentSecurityPolicy #CSSInjection
Keypoints
- Nonce-based CSP can be bypassed through CSS injection and cache manipulation techniques.
- Vulnerabilities arise from unsanitized user input inserted using .innerHTML.
- Attacks leverage CSS selectors and background image requests to leak nonces.
- Browser caching mechanisms like bfcache and disk cache are exploited to execute injected scripts.
- Holistic security practices are essential to prevent such complex bypass methods.
Read More: https://gbhackers.com/researchers-defeat-content-security-policy-protections/