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LFI attacks for Predators

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What is an LFI vulnerability??
what? you don't know!!? lulz, an LFI or (Local file inclusion)  vulnerability ---much like other web attacks, exists when unclean user input is used to determine input to any of the  follow php functions  include : "Files are included based on the file path given or, if none is given, the include_path specified. If the file isn't found in the include_path, include() will finally check in the calling script's own directory and the current working directory before failing. The include() construct will emit a warning if it cannot find a file; this is different behavior from require(), which will emit a fatal_error."an interesting thing to note is that include will actually search for files with the specified name if an absolute path is not given the script will search for it in the include_path, this means if you can influence the environment variables that a script runs under, you may be able to fool it into including the wrong files!