My CDN Was Compromised!
Explore how subresource integrity (SRI) helps protect your web application by verifying that static assets served from third-party CDNs have not been tampered with. Understand how browsers use cryptographic hashes to ensure only genuine assets are executed, adding an important security layer against compromised CDN risks.
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Introduction
Often times, web applications serve some of their content through a content delivery network (CDN), typically in the form of static assets like JavaScript or CSS files, while the main document is rendered by a webserver. This gives developers limited control over the static assets themselves, as they’re usually uploaded to a third-party CDN (e.g., CloudFront, Google Cloud CDN, Akamai).
Now, suppose an attacker gained access to your login credentials on the CDN provider’s portal and uploaded a modified version of your static assets, injecting malicious code. How could you prevent such a risk for your users?