# XSLT Server Side Injection (Extensible Stylesheet Languaje Transformations)
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## Basic Information
XSLT é uma tecnologia empregada para transformar documentos XML em diferentes formatos. Ela vem em três versões: 1, 2 e 3, sendo a versão 1 a mais comumente utilizada. O processo de transformação pode ser executado tanto no servidor quanto no navegador.
Os frameworks que são mais frequentemente utilizados incluem:
- **Libxslt** do Gnome,
- **Xalan** da Apache,
- **Saxon** da Saxonica.
Para a exploração de vulnerabilidades associadas ao XSLT, é necessário que as tags xsl estejam armazenadas no lado do servidor, seguidas pelo acesso a esse conteúdo. Uma ilustração de tal vulnerabilidade está documentada na seguinte 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/).
## Example - 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 %}
Executar:
```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 |
```
### Impressão Digital
{% code title="detection.xsl" %}
```xml
Version:
Vendor:
Vendor URL:
Product Name:
Product Version:
Is Schema Aware ?:
Supports Serialization:
Supports Backwards Compatibility:
```
{% endcode %}
E execute
```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/
```
### Ler Arquivo Local
{% 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
```
### Versões
Pode haver mais ou menos funções dependendo da versão do XSLT utilizada:
* [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/)
## Impressão Digital
Carregue isso e obtenha informações
```xml
Version:
Vendor:
Vendor URL:
Product Name:
Product Version:
Is Schema Aware ?:
Supports Serialization:
Supports Backwards Compatibility:
```
## SSRF
```xml
```
## Injeção de Javascript
```xml
```
## Directory listing (PHP)
### **Opendir + readdir**
```xml
-
-
-
-
-
-
-
-
-
```
### **Assert (var\_dump + scandir + false)**
```xml
```
## Ler arquivos
### **Interno - PHP**
```xml
```
### **Interno - XXE**
```xml
]>
&ext_file;
```
### **Através do HTTP**
```xml
```
```xml
]>
&passwd;
```
### **Interno (função PHP)**
```xml
```
```xml
```
### Varredura de portas
```xml
```
## Escrever em um arquivo
### XSLT 2.0
```xml
Write Local File
```
### **Extensão Xalan-J**
```xml
Write Local File
```
Outras maneiras de escrever arquivos no PDF
## Incluir XSL externo
```xml
```
```xml
```
## Executar código
### **php:function**
```xml
```
```xml
```
Execute código usando outros frameworks no PDF
### **Mais Linguagens**
**Nesta página você pode encontrar exemplos de RCE em outras linguagens:** [**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)**
## **Acessar funções estáticas PHP de classes**
A seguinte função chamará o método estático `stringToUrl` da classe XSL:
```xml
```
(Exemplo de [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))
## Mais Payloads
* Verifique [https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/XSLT%20Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/XSLT%20Injection)
* Verifique [https://vulncat.fortify.com/en/detail?id=desc.dataflow.java.xslt_injection](https://vulncat.fortify.com/en/detail?id=desc.dataflow.java.xslt_injection)
## **Lista de Detecção de Força Bruta**
{% embed url="https://github.com/carlospolop/Auto_Wordlists/blob/main/wordlists/xslt.txt" %}
## **Referências**
* [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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Support HackTricks
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