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fix(deps): update dependency astro to v4.16.1 [security] #263

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fix(deps): update dependency astro to v4.16.1 [security] #263

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@renovate renovate bot commented Oct 14, 2024 •
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This PR contains the following updates:

Package Change Age Adoption Passing Confidence
astro (source) 4.15.9 -> 4.16.1 age adoption passing confidence
astro (source) 4.15.11 -> 4.16.1 age adoption passing confidence

GitHub Vulnerability Alerts

CVE-2024-47885

Summary

A DOM Clobbering gadget has been discoverd in Astro's client-side router. It can lead to cross-site scripting (XSS) in websites enables Astro's client-side routing and has stored attacker-controlled scriptless HTML elements (i.e., iframe tags with unsanitized name attributes) on the destination pages.

Details

Backgrounds

DOM Clobbering is a type of code-reuse attack where the attacker first embeds a piece of non-script, seemingly benign HTML markups in the webpage (e.g. through a post or comment) and leverages the gadgets (pieces of js code) living in the existing javascript code to transform it into executable code. More for information about DOM Clobbering, here are some references:

[1] https://scnps.co/papers/sp23_domclob.pdf
[2] https://research.securitum.com/xss-in-amp4email-dom-clobbering/

Gadgets found in Astro

We identified a DOM Clobbering gadget in Astro's client-side routing module, specifically in the <ViewTransitions /> component. When integrated, this component introduces the following vulnerable code, which is executed during page transitions (e.g., clicking an <a> link):

https://github.com/withastro/astro/blob/7814a6cad15f06931f963580176d9b38aa7819f2/packages/astro/src/transitions/router.ts#L135-L156

However, this implementation is vulnerable to a DOM Clobbering attack. The document.scripts lookup can be shadowed by an attacker injected non-script HTML elements (e.g., <img name="scripts"><img name="scripts">) via the browser's named DOM access mechanism. This manipulation allows an attacker to replace the intended script elements with an array of attacker-controlled scriptless HTML elements.

The condition script.dataset.astroExec === '' on line 138 can be bypassed because the attacker-controlled element does not have a data-astroExec attribute. Similarly, the check on line 134 can be bypassed as the element does not require a type attribute.

Finally, the innerHTML of an attacker-injected non-script HTML elements, which is plain text content before, will be set to the .innerHTML of an script element that leads to XSS.

PoC

Consider a web application using Astro as the framework with client-side routing enabled and allowing users to embed certain scriptless HTML elements (e.g., form or iframe). This can be done through a bunch of website's feature that allows users to embed certain script-less HTML (e.g., markdown renderers, web email clients, forums) or via an HTML injection vulnerability in third-party JavaScript loaded on the page.

For PoC website, please refer to: https://stackblitz.com/edit/github-4xgj2d. Clicking the "about" button in the menu will trigger an alert(1) from an attacker-injected form element.

---
import Header from "../components/Header.astro";
import Footer from "../components/Footer.astro";
import { ViewTransitions } from "astro:transitions";
import "../styles/global.css";
const { pageTitle } = Astro.props;
---
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
    <meta name="viewport" content="width=device-width" />
    <meta name="generator" content={Astro.generator} />
    <title>{pageTitle}</title>
    <ViewTransitions />
  </head>
  <body>
    <!--USER INPUT-->
    <iframe name="scripts">alert(1)</iframe>
    <iframe name="scripts">alert(1)</iframe>
    <!--USER INPUT-->
    
    <Header />
    <h1>{pageTitle}</h1>
    <slot />
    <Footer />
    <script>
      import "../scripts/menu.js";
    </script>
  </body>
</html>

Impact

This vulnerability can result in cross-site scripting (XSS) attacks on websites that built with Astro that enable the client-side routing with ViewTransitions and store the user-inserted scriptless HTML tags without properly sanitizing the name attributes on the page.

Patch

We recommend replacing document.scripts with document.getElementsByTagName('script') for referring to script elements. This will mitigate the possibility of DOM Clobbering attacks leveraging the name attribute.

Reference

Similar issues for reference:

Release Notes

withastro/astro (astro)

v4.16.1

Compare Source

Patch Changes

  • #​12177 a4ffbfa Thanks @​matthewp! - Ensure we target scripts for execution in the router

    Using document.scripts is unsafe because if the application has a name="scripts" this will shadow the built-in document.scripts. Fix is to use getElementsByTagName to ensure we're only grabbing real scripts.

  • #​12173 2d10de5 Thanks @​ematipico! - Fixes a bug where Astro Actions couldn't redirect to the correct pathname when there was a rewrite involved.

v4.16.0

Compare Source

Minor Changes

  • #​12039 710a1a1 Thanks @​ematipico! - Adds a markdown.shikiConfig.langAlias option that allows aliasing a non-supported code language to a known language. This is useful when the language of your code samples is not a built-in Shiki language, but you want your Markdown source to contain an accurate language while also displaying syntax highlighting.

    The following example configures Shiki to highlight cjs code blocks using the javascript syntax highlighter:

    import { defineConfig } from 'astro/config';

export default defineConfig({
  markdown: {
    shikiConfig: {
      langAlias: {
        cjs: 'javascript',
      },
    },
  },
});

    Then in your Markdown, you can use the alias as the language for a code block for syntax highlighting:

    ```cjs
'use strict';

function commonJs() {
  return 'I am a commonjs file';
}
```

  • #​11984 3ac2263 Thanks @​chaegumi! - Adds a new build.concurreny configuration option to specify the number of pages to build in parallel

    In most cases, you should not change the default value of 1.

    Use this option only when other attempts to reduce the overall rendering time (e.g. batch or cache long running tasks like fetch calls or data access) are not possible or are insufficient.

    Use this option only if the refactors are not possible. If the number is set too high, the page rendering may slow down due to insufficient memory resources and because JS is single-threaded.

    [!WARNING]
    This feature is stable and is not considered experimental. However, this feature is only intended to address difficult performance issues, and breaking changes may occur in a minor release to keep this option as performant as possible.

    // astro.config.mjs
import { defineConfig } from 'astro';

export default defineConfig({
  build: {
    concurrency: 2,
  },
});
Patch Changes

  • #​12160 c6fd1df Thanks @​louisescher! - Fixes a bug where astro.config.mts and astro.config.cts weren't reloading the dev server upon modifications.

  • #​12130 e96bcae Thanks @​thehansys! - Fixes a bug in the parsing of x-forwarded-\* Request headers, where multiple values assigned to those headers were not correctly parsed.

    Now, headers like x-forwarded-proto: https,http are correctly parsed.

  • #​12147 9db755a Thanks @​ascorbic! - Skips setting statusMessage header for HTTP/2 response

    HTTP/2 doesn't support status message, so setting this was logging a warning.

  • #​12151 bb6d37f Thanks @​ematipico! - Fixes an issue where Astro.currentLocale wasn't incorrectly computed when the defaultLocale belonged to a custom locale path.

  • Updated dependencies [710a1a1]:

v4.15.12

Compare Source

Patch Changes

v4.15.11

Compare Source

Patch Changes

  • #​12097 11d447f Thanks @​ascorbic! - Fixes error where references in content layer schemas sometimes incorrectly report as missing

  • #​12108 918953b Thanks @​lameuler! - Fixes a bug where data URL images were not correctly handled. The bug resulted in an ENAMETOOLONG error.

  • #​12105 42037f3 Thanks @​ascorbic! - Returns custom statusText that has been set in a Response

  • #​12109 ea22558 Thanks @​ematipico! - Fixes a regression that was introduced by an internal refactor of how the middleware is loaded by the Astro application. The regression was introduced by #​11550.

    When the edge middleware feature is opted in, Astro removes the middleware function from the SSR manifest, and this wasn't taken into account during the refactor.

  • #​12106 d3a74da Thanks @​ascorbic! - Handles case where an immutable Response object is returned from an endpoint

  • #​12090 d49a537 Thanks @​markjaquith! - Server islands: changes the server island HTML placeholder comment so that it is much less likely to get removed by HTML minifiers.

v4.15.10

Compare Source

Patch Changes

Configuration

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⚠️ No Changeset found

Latest commit: 05f6228

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