fix: resolve CDN redirect failure by using loose security policy and CSP whitelist #96
Conversation
Summary of ChangesHello @xihale, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request addresses a CDN redirect failure by implementing a more flexible security policy. It removes strict Highlights
Using Gemini Code AssistThe full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips. Invoking Gemini You can request assistance from Gemini at any point by creating a comment using either
Customization To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a Limitations & Feedback Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here. You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension. Footnotes
|
![gemini-code-assist[bot]](https://avatars.githubusercontent.com/in/956858?s=60&v=4){kind=small}
There was a problem hiding this comment.
Code Review
This pull request aims to resolve a CDN redirect failure by removing Subresource Integrity (SRI) checks and introducing a Content Security Policy (CSP). However, these changes significantly degrade the site's security posture, making it vulnerable to supply chain attacks and Cross-Site Scripting (XSS). The removal of SRI exposes users to potential script injection if the CDN is compromised, and the new CSP is overly permissive due to the use of 'unsafe-inline' and 'unsafe-eval', which negates its protective capabilities. It is strongly recommended to find solutions that maintain SRI (e.g., stable URLs or self-hosting) and to tighten the CSP by avoiding 'unsafe-inline' and 'unsafe-eval' through nonces or hashes.
| <script defer src="https://cdnjs.webstatic.cn/ajax/libs/KaTeX/0.16.9/contrib/auto-render.min.js" onload="renderKaTeX()"></script> | ||
| </ctx> | ||
| <ctx :if="$page.custom.getOr('mermaid', false)"> | ||
| <script defer src="https://cdnjs.webstatic.cn/ajax/libs/mermaid/11.12.0/mermaid.min.js" integrity="sha512-5TKaYvhenABhlGIKSxAWLFJBZCSQw7HTV7aL1dJcBokM/+3PNtfgJFlv8E6Us/B1VMlQ4u8sPzjudL9TEQ06ww==" crossorigin="anonymous" onload="mermaid.initialize({theme: window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'default'}); mermaid.run();"></script> | ||
| <script defer src="https://cdnjs.webstatic.cn/ajax/libs/mermaid/11.12.0/mermaid.min.js" onload="mermaid.initialize({theme: window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'default'}); mermaid.run();"></script> | ||
| </ctx> |
There was a problem hiding this comment.
As with the other resources, removing Subresource Integrity (SRI) for the KaTeX and Mermaid scripts is a security risk. It makes your site vulnerable to attacks originating from a compromised CDN. It is highly advisable to restore SRI protection, perhaps by self-hosting these dependencies.
| href="https://cdnjs.webstatic.cn/ajax/libs/KaTeX/0.16.9/katex.min.css" | ||
| integrity="sha512-fHwaWebuwA7NSF5Qg/af4UeDx9XqUpYpOGgubo3yWu+b2IQR4UeQwbb42Ti7gVAjNtVoI/I9TEoYeu9omwcC6g==" | ||
| crossorigin="anonymous" | ||
| rel="stylesheet" | ||
| /> | ||
| <script | ||
| defer | ||
| src="https://cdnjs.webstatic.cn/ajax/libs/KaTeX/0.16.9/katex.min.js" | ||
| integrity="sha512-LQNxIMR5rXv7o+b1l8+N1EZMfhG7iFZ9HhnbJkTp4zjNr5Wvst75AqUeFDxeRUa7l5vEDyUiAip//r+EFLLCyA==" | ||
| crossorigin="anonymous" | ||
| ></script> | ||
| <script | ||
| defer | ||
| src="https://cdnjs.webstatic.cn/ajax/libs/KaTeX/0.16.9/contrib/auto-render.min.js" | ||
| integrity="sha512-iWiuBS5nt6r60fCz26Nd0Zqe0nbk1ZTIQbl3Kv7kYsX+yKMUFHzjaH2+AnM6vp2Xs+gNmaBAVWJjSmuPw76Efg==" | ||
| crossorigin="anonymous" | ||
| onload="renderMathInElement(document.body);" |
There was a problem hiding this comment.
The integrity and crossorigin attributes were removed from the KaTeX resources, disabling Subresource Integrity (SRI). This exposes the site to supply chain attacks if the CDN is compromised, especially given the very loose Content Security Policy (CSP) also implemented. SRI is a crucial security feature that verifies resources from third-party servers haven't been tampered with. If redirects are causing SRI failures, consider using a more stable CDN provider or hosting the assets locally instead of disabling this security control.
| <head id="head"> | ||
| <meta charset="utf-8"> | ||
| <meta name="viewport" content="initial-scale=1"> | ||
| <meta http-equiv="Content-Security-Policy" content="script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdnjs.webstatic.cn https://cdnjs.cloudflare.com https://hm.baidu.com; style-src 'self' 'unsafe-inline' https://cdnjs.webstatic.cn https://cdnjs.cloudflare.com; img-src 'self' data: https:; connect-src 'self' https://en.liujiacai.net https://cdnjs.cloudflare.com https://hm.baidu.com;"> |
There was a problem hiding this comment.
The newly added Content Security Policy (CSP) is overly permissive, significantly reducing its effectiveness against Cross-Site Scripting (XSS) attacks. The use of 'unsafe-inline' and 'unsafe-eval' in script-src allows arbitrary inline scripts and dangerous functions, posing major security risks. Additionally, the img-src directive using https: is too broad, allowing images from any HTTPS domain, which could be abused. Whitelisting entire CDN domains like cdnjs.cloudflare.com is also a known risk.
Recommendations:
- Remove
'unsafe-inline': Refactor inline scripts or use CSP nonces/hashes. - Remove
'unsafe-eval': Investigate library configurations that don't rely oneval(). - Tighten
img-src: Replacehttps:with a whitelist of specific domains.
It is recommended to use nonces or hashes for legitimate inline scripts and to be more restrictive with allowed sources to strengthen this policy.
1 participant
No description provided.