Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

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

Open
wants to merge 1 commit into
base: main
Choose a base branch
from
Open

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

wants to merge 1 commit into from

Conversation

depfu[bot]
Copy link
Contributor

@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:

Depfu Status

Depfu will automatically keep this PR conflict-free, as long as you don't add any commits to this branch yourself. You can also trigger a rebase manually by commenting with @depfu rebase.

All Depfu comment commands
@​depfu rebase
Rebases against your default branch and redoes this update
@​depfu recreate
Recreates this PR, overwriting any edits that you've made to it
@​depfu merge
Merges this PR once your tests are passing and conflicts are resolved
@​depfu cancel merge
Cancels automatic merging of this PR
@​depfu close
Closes this PR and deletes the branch
@​depfu reopen
Restores the branch and reopens this PR (if it's closed)
@​depfu pause
Ignores all future updates for this dependency and closes this PR
@​depfu pause [minor|major]
Ignores all future minor/major updates for this dependency and closes this PR
@​depfu resume
Future versions of this dependency will create PRs again (leaves this PR as is)

@depfu depfu bot added the depfu label Mar 21, 2024
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Reviewers
No reviews
Assignees
No one assigned
Labels
depfu
Projects
None yet
Milestone
No milestone
Development

Successfully merging this pull request may close these issues.

None yet
0 participants