@strapi/plugin-upload has a Denial-of-Service via Improper Exception Handling

Summary

A Denial-of-Service was found in the media upload process causing the server to crash without restarting, affecting either development and production environments.

Details

Usually, errors in the application cause it to log the error and keep it running for other clients. This behavior, in contrast, stops the server execution, making it unavailable for any clients until it's manually restarted.

PoC

Due to a bug in what we believe to be Burp’s decoding system, we couldn’t produce a valid file to easily reproduce the vulnerability. Instead, the issue can be reproduced by following these steps:

1. Configure Burp’s proxy between a browser and a Strapi server
2. Log in and upload an image through the Media Library page while having Burp’s interceptor turned on
3. After capturing the upload POST request in Burp, add %00 at the end of the file extension from the Content-Disposition, in the filename parameter (See reference image 1 below)
4. Using the cursor, select the added %00 and right-click it. Click in Convert selection > URL > URL decode to transform the selected text into a null byte
5. Forward the modified request. The server should print an error and crash with the error ERR_INVALID_ARG_VALUE (See reference log 1 below)

By following the data flow, we reached the line of code where we believe the DoS is being caused. The simpler way of fixing this vulnerability seems to be avoiding the error thrown by whitelisting the characters used in the extension.

Reference Image 1

Reference Log 1

[2024-03-22 10:23:42.629] http: POST /upload (22 ms) 400
node:internal/fs/utils:379
  const err = new ERR_INVALID_ARG_VALUE(
              ^

TypeError [ERR_INVALID_ARG_VALUE]: The argument 'path' must be a string, Uint8Array, or URL without null bytes. Received '/mnt/storage/Development/GHSA-pm9q-xj9p-96pm/public/uploads/replaceme_png_88efe6a165.png\x00'
    at new WriteStream (node:internal/fs/streams:340:5)
    at Object.createWriteStream (node:fs:3123:10)
    at /mnt/storage/Development/GHSA-pm9q-xj9p-96pm/node_modules/@strapi/provider-upload-local/dist/index.js:71:33
    at new Promise (<anonymous>)
    at Object.uploadStream (/mnt/storage/Development/GHSA-pm9q-xj9p-96pm/node_modules/@strapi/provider-upload-local/dist/index.js:68:16)
    at Object.uploadStream (/mnt/storage/Development/GHSA-pm9q-xj9p-96pm/node_modules/@strapi/plugin-upload/server/register.js:80:35)
    at Object.upload (/mnt/storage/Development/GHSA-pm9q-xj9p-96pm/node_modules/@strapi/plugin-upload/server/services/provider.js:16:46)
    at Object.uploadImage (/mnt/storage/Development/GHSA-pm9q-xj9p-96pm/node_modules/@strapi/plugin-upload/server/services/upload.js:220:48) {
  code: 'ERR_INVALID_ARG_VALUE'
}