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<?php function lfi_be_gone($userProvided, $basePath) { $real = realpath($userProvided); if ($real === false) { throw new Exception('LOL NOPE'); } if (strpos($real, $basePath) !== 0) { throw new Exception('LOL NOPE'); } return $real; } # Usage: $userProvidedVariable = '../../../../../../../../etc/passwd'; require_once lfi_be_gone("includes/" . $userProvidedVariable, $_SERVER['DOCUMENT_ROOT'] . '/includes/');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Exception: LOL NOPE in /in/UFqfm:7 Stack trace: #0 /in/UFqfm(21): lfi_be_gone('includes/../../...', '/includes/') #1 {main} thrown in /in/UFqfm on line 7
Process exited with code 255.

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