CWE-616 Incomplete Identification of Uploaded File Variables (PHP)

The PHP application uses an old method for processing uploaded files by referencing the four global variables that are set for each file (e.g. $varname, $varname_size, $varname_name, $varname_type).

• Confidentiality, Integrity: Read Files or Directories, Modify Files or Directories — These variables could be overwritten by attackers via POST requests, cookies, or other methods, causing the application to read or process unauthorized files.

• [Architecture and Design] Use PHP 4 or later. • [Architecture and Design] If you must support older PHP versions, write your own version of is_uploaded_file() and run it against $HTTP_POST_FILES['userfile'])) • [Implementation] For later PHP versions, reference uploaded files using the $HTTP_POST_FILES or $_FILES variables, and use is_uploaded_file() or move_uploaded_file() to ensure that you are dealing with an uploaded file.

• CVE-2002-1460: Forum does not properly verify whether a file was uploaded or if the associated variables were set by POST, allowing remote attackers to read arbitrary files. • CVE-2002-1759: Product doesn't check if the variables for an upload were set by uploading the file, or other methods such as $_POST. • CVE-2002-1710: Product does not distinguish uploaded file from other files.