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run code in 200+ php & hhvm versions
Bugs & Features
<?php $allowed = array('txt', 'docx'); $zzfile = "flag.\x0a\xe2\x90\xA4\x09\x08php"; $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>'; ?>
based on 1c5LS
Output for 7.2.11, 7.3.0rc3 - 7.3.0rc4
filename: string(14) "flag. ␤ php" matches:array(0) { } flag. ␤ phpReading <strong>flag. ␤ php</strong>...<pre> Warning: readfile(): open_basedir restriction in effect. File(flag. ␤ php) is not within the allowed path(s): (/tmp:/in:/etc) in /in/7EWaL on line 19 Warning: readfile(flag. ␤ php): failed to open stream: Operation not permitted in /in/7EWaL on line 19 </pre>
Output for 4.3.2 - 7.1.10, 7.2.0, 7.3.0alpha1 - 7.3.0beta1
filename: string(14) "flag. ␤ php" matches:array(0) { } flag. ␤ phpReading <strong>flag. ␤ php</strong>...<pre> Warning: readfile(flag. ␤ php): failed to open stream: No such file or directory in /in/7EWaL on line 19 </pre>
Output for 7.1.20, 7.2.6
filename: string(14) "flag. ␤ php" matches:array(0) { } flag. ␤ phpReading <strong>flag. ␤ php</strong>...<pre> Warning: readfile(): open_basedir restriction in effect. File(flag. ␤ php) is not within the allowed path(s): (/tmp:/in) in /in/7EWaL on line 19 Warning: readfile(flag. ␤ php): failed to open stream: Operation not permitted in /in/7EWaL on line 19 </pre>
Output for 4.3.0 - 4.3.1
filename: string(14) "flag. ␤ php" matches:array(0) { } flag. ␤ phpReading <strong>flag. ␤ php</strong>...<pre> Warning: readfile(flag. ␤ php) [http://www.php.net/function.readfile]: failed to create stream: No such file or directory in /in/7EWaL on line 19 </pre>