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<?php $allowed = array('txt', 'docx'); $zzfile = "flag.\x0a\xe2x08php"; $filename = $zzfile; print "\nfilename:\n"; var_dump($filename); if (preg_match('#\.(.+)$#', $filename, $matches) && isset($matches[1]) && !in_array($matches[1], $allowed)) die("Extension ${matches[1]} is not allowed!"); echo "\nmatches:"; var_dump($matches); if (strrpos($filename, '.') !== false) //zwraca od pierwszej kropki od prawej do konca + end $ext = substr($filename, strrpos($filename, '.')); else $ext = ''; $newfile = "flag$ext"; print $newfile; echo "Reading <strong>$newfile</strong>..."; // Hint: the flag is in flag.php echo '<pre>'; readfile($newfile); echo '</pre>'; ?>
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/ekr23 on line 8 filename: string(13) "flag. �x08php" matches:array(0) { } flag. �x08phpReading <strong>flag. �x08php</strong>...<pre> Warning: readfile(): open_basedir restriction in effect. File(flag. �x08php) is not within the allowed path(s): (/tmp:/in:/etc) in /in/ekr23 on line 19 Warning: readfile(flag. �x08php): Failed to open stream: Operation not permitted in /in/ekr23 on line 19 </pre>

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