Bisherigen Sucheinträge:
security functions ,
include functions ,
variable functions ,
post functions
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Da PHP die Funktionen der C-Standardbibliothek für Dateisystemoperationen nutzt kann es Nullbytes in unerwarteter Weise verarbeiten. Da Nullbytes in C das Stringende festlegen werden Strings die solche enthalten nicht vollständig verarbeitet sondern nur bis zum ersten Auftreten eines Nullbytes. Das folgende Beispiel zeigt verwundbaren Programmkode der das Problem demonstriert:
Beispiel #1 Skript mit Nullbyte-Verwundbarkeit
<?php
$file = $_GET['file']; // "../../etc/passwd\0"
if (file_exists('/home/wwwrun/'.$file.'.php')) {
// file_exists gibt true zurück da /home/wwwrun/../../etc/passwd existiert
include '/home/wwwrun/'.$file.'.php';
// die Datei /etc/passwd wird eingebunden
}
?>
Daher sollte jede nicht vertrauenswürdige Zeichenkette, die in Dateisystemoperationen verwendet wird, ordentlich geprüft werden. Hier sehen Sie eine eine bessere Versiond des vorhergehenden Beispiels:
Beispiel #2 Korrekte Validierung der Eingabe
<?php
$file = $_GET['file'];
// Gestatte gültige Werte
switch ($file) {
case 'main':
case 'foo':
case 'bar':
include '/home/wwwrun/include/'.$file.'.php';
break;
default:
include '/home/wwwrun/include/main.php';
}
?>
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