# Reverse Tab Nabbing In a situation where an attacker can control the `href` argument of an ` ### Without back link Link between parent and child pages when prevention attribute is used:

## How to exploit Create the following pages in a folder and run a web server with `python3 -m http.server` Then, access `http://127.0.0.1:8000/vulnerable.html`, click on the link and note how the original website URL changes. ```html vulnerable.html

Victim Site

Controlled by the attacker ``` ```html malicious.html ``` ```html malicious_redir.html

New Malicious Site

``` ### Accessible properties The malicious site can only access to the following properties from the opener javascript object reference (that is in fact a reference to a window javascript class instance) in case of cross origin (cross domains) access: * `opener.closed`: Returns a boolean value indicating whether a window has been closed or not. * `opener.frames`: Returns all iframe elements in the current window. * `opener.length`: Returns the number of iframe elements in the current window. * `opener.opener`: Returns a reference to the window that created the window. * `opener.parent`: Returns the parent window of the current window. * `opener.self`: Returns the current window. * `opener.top`: Returns the topmost browser window. If the domains are the same then the malicious site can access all the properties exposed by the [window](https://developer.mozilla.org/en-US/docs/Web/API/Window) javascript object reference. ## Prevention Prevention information are documented into the [HTML5 Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/HTML5_Security_Cheat_Sheet.html#tabnabbing).