A vulnerability has been discovered which allows Node.js integration to be re-enabled in some Electron applications that disable it.
For the application to be impacted by this vulnerability it must meet all of these conditions
- Runs on Electron 1.7, 1.8, or a 2.0.0-beta
- Allows execution of arbitrary remote code
- Disables Node.js integration
- Does not explicitly declare webviewTag: false in its webPreferences
- Does not enable the nativeWindowOption option
- Does not intercept new-window events and manually override event.newGuest without using the supplied options tag
Recommendation
Update to electron version 1.7.13, 1.8.4, or 2.0.0-beta.5 or later.
If you are unable to update your Electron version can mitigate the vulnerability with the following code.
app.on('web-contents-created', (event, win) => {
win.on('new-window', (event, newURL, frameName, disposition,
options, additionalFeatures) => {
if (!options.webPreferences) options.webPreferences = {};
options.webPreferences.nodeIntegration = false;
options.webPreferences.nodeIntegrationInWorker = false;
options.webPreferences.webviewTag = false;
delete options.webPreferences.preload;
})
})
// and *IF* you don't use WebViews at all,
// you might also want
app.on('web-contents-created', (event, win) => {
win.on('will-attach-webview', (event, webPreferences, params) => {
event.preventDefault();
})
})References
A vulnerability has been discovered which allows Node.js integration to be re-enabled in some Electron applications that disable it.
For the application to be impacted by this vulnerability it must meet all of these conditions
Recommendation
Update to
electronversion 1.7.13, 1.8.4, or 2.0.0-beta.5 or later.If you are unable to update your Electron version can mitigate the vulnerability with the following code.
References