# XSLT Server Side Injection (Extensible Stylesheet Languaje Transformations)
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## Informazioni di base
XSLT è una tecnologia utilizzata per trasformare documenti XML in diversi formati. Esistono tre versioni: 1, 2 e 3, con la versione 1 che è la più comunemente utilizzata. Il processo di trasformazione può essere eseguito sia sul server che all'interno del browser.
I framework più frequentemente utilizzati includono:
- **Libxslt** di Gnome,
- **Xalan** di Apache,
- **Saxon** di Saxonica.
Per sfruttare le vulnerabilità associate a XSLT, è necessario che i tag xsl siano memorizzati sul lato server, seguiti dall'accesso a quel contenuto. Un'illustrazione di tale vulnerabilità è documentata nella seguente fonte: [https://www.gosecure.net/blog/2019/05/02/esi-injection-part-2-abusing-specific-implementations/](https://www.gosecure.net/blog/2019/05/02/esi-injection-part-2-abusing-specific-implementations/).
## Esempio - Tutorial
```bash
sudo apt-get install default-jdk
sudo apt-get install libsaxonb-java libsaxon-java
```
{% code title="xml.xml" %}
```xml
CD Title
The artist
Da Company
10000
1760
```
{% endcode %}
{% code title="xsl.xsl" %}
```xml
The Super title
```
{% endcode %}
Esegui:
```xml
saxonb-xslt -xsl:xsl.xsl xml.xml
Warning: at xsl:stylesheet on line 2 column 80 of xsl.xsl:
Running an XSLT 1.0 stylesheet with an XSLT 2.0 processor
The Super title
| Title |
artist |
| CD Title |
The artist |
```
### Impronta
{% code title="detection.xsl" %}
```xml
Version:
Vendor:
Vendor URL:
Product Name:
Product Version:
Is Schema Aware ?:
Supports Serialization:
Supports Backwards Compatibility:
```
{% endcode %}
E eseguire
```xml
$saxonb-xslt -xsl:detection.xsl xml.xml
Warning: at xsl:stylesheet on line 2 column 80 of detection.xsl:
Running an XSLT 1.0 stylesheet with an XSLT 2.0 processor
XSLT identification
Version:2.0
Vendor:SAXON 9.1.0.8 from Saxonica
Vendor URL:http://www.saxonica.com/
```
### Leggi File Locale
{% code title="read.xsl" %}
```xml
```
{% endcode %}
```xml
$ saxonb-xslt -xsl:read.xsl xml.xml
Warning: at xsl:stylesheet on line 1 column 111 of read.xsl:
Running an XSLT 1.0 stylesheet with an XSLT 2.0 processor
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
```
### SSRF
```xml
```
### Versioni
Potrebbero esserci più o meno funzioni a seconda della versione di XSLT utilizzata:
* [https://www.w3.org/TR/xslt-10/](https://www.w3.org/TR/xslt-10/)
* [https://www.w3.org/TR/xslt20/](https://www.w3.org/TR/xslt20/)
* [https://www.w3.org/TR/xslt-30/](https://www.w3.org/TR/xslt-30/)
## Impronta
Carica questo e prendi informazioni
```xml
Version:
Vendor:
Vendor URL:
Product Name:
Product Version:
Is Schema Aware ?:
Supports Serialization:
Supports Backwards Compatibility:
```
## SSRF
```xml
```
## Iniezione Javascript
```xml
```
## Elenco delle directory (PHP)
### **Opendir + readdir**
```xml
-
-
-
-
-
-
-
-
-
```
### **Assert (var\_dump + scandir + false)**
```xml
```
## Leggi file
### **Interno - PHP**
```xml
```
### **Interno - XXE**
```xml
]>
&ext_file;
```
### **Attraverso HTTP**
```xml
```
```xml
]>
&passwd;
```
### **Interno (funzione PHP)**
```xml
```
```xml
```
### Scansione delle porte
```xml
```
## Scrivere su un file
### XSLT 2.0
```xml
Write Local File
```
### **Estensione Xalan-J**
```xml
Write Local File
```
Altri modi per scrivere file nel PDF
## Includere XSL esterni
```xml
```
```xml
```
## Eseguire codice
### **php:function**
```xml
```
```xml
```
Esegui codice utilizzando altri framework nel PDF
### **Altre Lingue**
**In questa pagina puoi trovare esempi di RCE in altre lingue:** [**https://vulncat.fortify.com/en/detail?id=desc.dataflow.java.xslt\_injection#C%23%2FVB.NET%2FASP.NET**](https://vulncat.fortify.com/en/detail?id=desc.dataflow.java.xslt\_injection#C%23%2FVB.NET%2FASP.NET) **(C#, Java, PHP)**
## **Accedi alle funzioni statiche PHP dalle classi**
La seguente funzione chiamerà il metodo statico `stringToUrl` della classe XSL:
```xml
```
(Example from [http://laurent.bientz.com/Blog/Entry/Item/using\_php\_functions\_in\_xsl-7.sls](http://laurent.bientz.com/Blog/Entry/Item/using\_php\_functions\_in\_xsl-7.sls))
## More Payloads
* Check [https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/XSLT%20Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/XSLT%20Injection)
* Check [https://vulncat.fortify.com/en/detail?id=desc.dataflow.java.xslt_injection](https://vulncat.fortify.com/en/detail?id=desc.dataflow.java.xslt_injection)
## **Brute-Force Detection List**
{% embed url="https://github.com/carlospolop/Auto_Wordlists/blob/main/wordlists/xslt.txt" %}
## **References**
* [XSLT\_SSRF](https://feelsec.info/wp-content/uploads/2018/11/XSLT\_SSRF.pdf)\\
* [http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20Abusing%20XSLT%20for%20practical%20attacks%20-%20Arnaboldi%20-%20IO%20Active.pdf](http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20Abusing%20XSLT%20for%20practical%20attacks%20-%20Arnaboldi%20-%20IO%20Active.pdf)\\
* [http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20Abusing%20XSLT%20for%20practical%20attacks%20-%20Arnaboldi%20-%20Blackhat%202015.pdf](http://repository.root-me.org/Exploitation%20-%20Web/EN%20-%20Abusing%20XSLT%20for%20practical%20attacks%20-%20Arnaboldi%20-%20Blackhat%202015.pdf)
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