#include

#include

#include

#include

#include

char buffer$[192]=""$;

char filename$[192]=""$;

int main$($int argc, char $*$argv$[])$

$\{$

if $($argv$[1])\{$

snprintf$($filename$,255,"/$var$/$challenge$/$level$5/\%$s$",$ basename$($argv$[1]))$;

printf$("$Checking filename $\%$s

$",$ filename$)$;

if $($access$($filename$,$ X$\_$OK$))\{$

fprintf$($stderr$,$ "You do not have the permission to execute this file

$")$;

return $1$;

$\}$

$\}$

else $\{$

fprintf$($stderr$,$ "Please provide the program name

$")$;

return $2$;

$\}$

if $($argv$[2])\{$

strcpy$($buffer$,$ argv$[2])$;

$\}$

else $\{$

gets$($buffer$)$;

$\}$

printf$("$Executing filename $\%$s

$",$ filename$)$;

execlp$($filename$,$ filename, buffer, $($char $*)0)$;

return $0$;

$\}$

What are the vulnerabilities in this program? how can I exploit $?$