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🚨 [security] Update webpack-dev-middleware 5.3.1 → 5.3.4 (patch) #528

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🚨 [security] Update webpack-dev-middleware 5.3.1 → 5.3.4 (patch) #528

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@depfu depfu bot commented Mar 21, 2024

🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ webpack-dev-middleware (5.3.1 → 5.3.4) · Repo · Changelog

Security Advisories 🚨

🚨 Path traversal in webpack-dev-middleware

Summary

The webpack-dev-middleware middleware does not validate the supplied URL address sufficiently before returning the local file. It is possible to access any file on the developer's machine.

Details

The middleware can either work with the physical filesystem when reading the files or it can use a virtualized in-memory memfs filesystem.
If writeToDisk configuration option is set to true, the physical filesystem is used:

    <tbody>
else if (context.options.writeToDisk !== true) {

The getFilenameFromUrl method is used to parse URL and build the local file path.
The public path prefix is stripped from the URL, and the unsecaped path suffix is appended to the outputPath:


As the URL is not unescaped and normalized automatically before calling the midlleware, it is possible to use %2e and %2f sequences to perform path traversal attack.

PoC

A blank project can be created containing the following configuration file webpack.config.js:
module.exports = { devServer: { devMiddleware: { writeToDisk: true } } };

When started, it is possible to access any local file, e.g. /etc/passwd:
$ curl localhost:8080/public/..%2f..%2f..%2f..%2f../etc/passwd

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin

Impact

The developers using webpack-dev-server or webpack-dev-middleware are affected by the issue. When the project is started, an attacker might access any file on the developer's machine and exfiltrate the content (e.g. password, configuration files, private source code, ...).

If the development server is listening on a public IP address (or 0.0.0.0), an attacker on the local network can access the local files without any interaction from the victim (direct connection to the port).

If the server allows access from third-party domains (CORS, Allow-Access-Origin: * ), an attacker can send a malicious link to the victim. When visited, the client side script can connect to the local server and exfiltrate the local files.

Recommendation

The URL should be unescaped and normalized before any further processing.

Release Notes

5.3.4

5.3.4 (2024-03-20)

Bug Fixes

  • security: do not allow to read files above (#1779) (189c4ac)

5.3.3

5.3.3 (2022-05-18)

Bug Fixes

5.3.2

5.3.2 (2022-05-17)

Bug Fixes

  • node types (#1195) (d68ab36)
  • compatibility with Node.js 18

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 74 commits:

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@depfu depfu bot added the depfu label Mar 21, 2024
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