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Translated ['pentesting-web/grpc-web-pentest.md'] to es
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# Pentesting gRPC-Web
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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 acceder 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 [**La Familia PEASS**](https://opensea.io/collection/the-peass-family), nuestra colección de [**NFTs**](https://opensea.io/collection/the-peass-family) exclusivos.
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* Consigue el [**merchandising oficial de PEASS & 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 PRs 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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## **Manipulación de Cargas Útiles de gRPC-Web**
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gRPC-Web utiliza Content-Type: `application/grpc-web-text` en las solicitudes, que es una especie de protobuf en forma codificada en base64, puedes usar la herramienta [gprc-coder](https://github.com/nxenon/grpc-pentest-suite), y también puedes instalar su [Extensión de Burp Suite](https://github.com/nxenon/grpc-pentest-suite).
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### **Manual con la Herramienta gGRPC Coder**
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1. Primero decodifica la carga útil:
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```bash
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echo "AAAAABYSC0FtaW4gTmFzaXJpGDY6BVhlbm9u" | python3 grpc-coder.py --decode --type grpc-web-text | protoscope > out.txt
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```
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2. Edita el contenido del payload decodificado
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```
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nano out.txt
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2: {"Amin Nasiri Xenon GRPC"}
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3: 54
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7: {"<script>alert(origin)</script>"}
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```
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3. Codifica el nuevo payload
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```bash
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protoscope -s out.txt | python3 grpc-coder.py --encode --type grpc-web-text
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```
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4. Utilice la salida en el interceptor de Burp:
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```
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AAAAADoSFkFtaW4gTmFzaXJpIFhlbm9uIEdSUEMYNjoePHNjcmlwdD5hbGVydChvcmlnaW4pPC9zY3JpcHQ+
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```
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### **Manual con la Extensión gRPC-Web Coder para Burp Suite**
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Puedes utilizar la Extensión gRPC-Web Coder para Burp Suite en [gRPC-Web Pentest Suite](https://github.com/nxenon/grpc-pentest-suite) que es más fácil. Puedes leer las instrucciones de instalación y uso en su repositorio.
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## **Análisis de Archivos Javascript gRPC-Web**
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Hay al menos un archivo Javascript en cada aplicación gRPC-Web. Puedes analizar el archivo para encontrar nuevos mensajes, endpoints y servicios. Intenta usar la herramienta [gRPC-Scan](https://github.com/nxenon/grpc-pentest-suite).
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1. Descarga el Archivo Javascript gRPC-Web
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2. Escanéalo con grpc-scan.py:
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```bash
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python3 grpc-scan.py --file main.js
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```
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3. Analice la salida y pruebe los nuevos endpoints y servicios:
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```
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Output:
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Found Endpoints:
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/grpc.gateway.testing.EchoService/Echo
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/grpc.gateway.testing.EchoService/EchoAbort
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/grpc.gateway.testing.EchoService/NoOp
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/grpc.gateway.testing.EchoService/ServerStreamingEcho
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/grpc.gateway.testing.EchoService/ServerStreamingEchoAbort
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Found Messages:
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grpc.gateway.testing.EchoRequest:
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+------------+--------------------+--------------+
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| Field Name | Field Type | Field Number |
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+============+====================+==============+
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| Message | Proto3StringField | 1 |
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+------------+--------------------+--------------+
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| Name | Proto3StringField | 2 |
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+------------+--------------------+--------------+
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| Age | Proto3IntField | 3 |
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+------------+--------------------+--------------+
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| IsAdmin | Proto3BooleanField | 4 |
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+------------+--------------------+--------------+
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| Weight | Proto3FloatField | 5 |
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+------------+--------------------+--------------+
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| Test | Proto3StringField | 6 |
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+------------+--------------------+--------------+
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| Test2 | Proto3StringField | 7 |
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+------------+--------------------+--------------+
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| Test3 | Proto3StringField | 16 |
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+------------+--------------------+--------------+
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| Test4 | Proto3StringField | 20 |
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+------------+--------------------+--------------+
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grpc.gateway.testing.EchoResponse:
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+--------------+--------------------+--------------+
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| Field Name | Field Type | Field Number |
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+==============+====================+==============+
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| Message | Proto3StringField | 1 |
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+--------------+--------------------+--------------+
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| Name | Proto3StringField | 2 |
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+--------------+--------------------+--------------+
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| Age | Proto3IntField | 3 |
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+--------------+--------------------+--------------+
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| IsAdmin | Proto3BooleanField | 4 |
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+--------------+--------------------+--------------+
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| Weight | Proto3FloatField | 5 |
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+--------------+--------------------+--------------+
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| Test | Proto3StringField | 6 |
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+--------------+--------------------+--------------+
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| Test2 | Proto3StringField | 7 |
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+--------------+--------------------+--------------+
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| Test3 | Proto3StringField | 16 |
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+--------------+--------------------+--------------+
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| Test4 | Proto3StringField | 20 |
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+--------------+--------------------+--------------+
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| MessageCount | Proto3IntField | 8 |
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+--------------+--------------------+--------------+
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grpc.gateway.testing.ServerStreamingEchoRequest:
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+-----------------+-------------------+--------------+
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| Field Name | Field Type | Field Number |
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+=================+===================+==============+
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| Message | Proto3StringField | 1 |
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+-----------------+-------------------+--------------+
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| MessageCount | Proto3IntField | 2 |
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+-----------------+-------------------+--------------+
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| MessageInterval | Proto3IntField | 3 |
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+-----------------+-------------------+--------------+
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grpc.gateway.testing.ServerStreamingEchoResponse:
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+------------+-------------------+--------------+
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| Field Name | Field Type | Field Number |
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+============+===================+==============+
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| Message | Proto3StringField | 1 |
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+------------+-------------------+--------------+
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grpc.gateway.testing.ClientStreamingEchoRequest:
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+------------+-------------------+--------------+
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| Field Name | Field Type | Field Number |
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+============+===================+==============+
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| Message | Proto3StringField | 1 |
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+------------+-------------------+--------------+
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grpc.gateway.testing.ClientStreamingEchoResponse:
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+--------------+----------------+--------------+
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| Field Name | Field Type | Field Number |
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+==============+================+==============+
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| MessageCount | Proto3IntField | 1 |
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+--------------+----------------+--------------+
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```
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## Referencias
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* [Artículo Hacking into gRPC-Web por Amin Nasiri](https://infosecwriteups.com/hacking-into-grpc-web-a54053757a45)
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* [Suite de Pentest gRPC-Web](https://github.com/nxenon/grpc-pentest-suite)
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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 acceder a la **última versión de PEASS o descargar HackTricks en PDF**? Consulta los [**PLANES DE SUSCRIPCIÓN**](https://github.com/sponsors/carlospolop)!
|
||||
* Descubre [**La Familia PEASS**](https://opensea.io/collection/the-peass-family), nuestra colección de [**NFTs**](https://opensea.io/collection/the-peass-family) exclusivos
|
||||
* Consigue el [**merchandising oficial de PEASS & HackTricks**](https://peass.creator-spring.com)
|
||||
* **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 PRs 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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