“Happy one hundred phases in the Park”photo album GETSHELL vulnerabilities-vulnerability warning-the black bar safety net

The vulnerability appears in the index.php if$do == 'upload' if$POST'formsub' $file = $FILES'upload'; if!$ file'error' ifstrpos$file'type', 'image' === 0 $hash = $POST'i'.'. jpg'; //if IIS, then here can be self-configured IIS malformed file extension to get a webshell...