# Reverse Tab Nabbing

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## Description In a situation where an **attacker** can **control** the **`href`** argument of an **` 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**. {% code title="vulnerable.html" %} ```markup

Victim Site

Controlled by the attacker ``` {% endcode %} {% code title="malicious.html" %} ```markup ``` {% endcode %} {% code title="malicious\_redir.html" %} ```markup

New Malicious Site

``` {% endcode %} ### 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). ## References {% embed url="" %}

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