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fix: "Mitigated XXE vulnerability in contact.php" #638

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fix: "Mitigated XXE vulnerability in contact.php" #638

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28 changes: 21 additions & 7 deletions owasp-top10-2021-apps/a5/vinijr-blog/app/contact.php
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Original file line number Diff line number Diff line change
@@ -1,12 +1,26 @@
<?php
libxml_disable_entity_loader(true);

$xmlfile = file_get_contents('php://input');

$dom = new DOMDocument();
$dom->loadXML($xmlfile, LIBXML_NOENT | LIBXML_DTDLOAD);

$dom->loadXML($xmlfile, LIBXML_NOENT | LIBXML_DTDLOAD | LIBXML_NOERROR | LIBXML_NOWARNING);

$contact = simplexml_import_dom($dom);
$name = $contact->name;
$email = $contact->email;
$subject = $contact->subject;
$message = $contact->message;

echo "Thanks for the message, $name !";
?>
if (isset($contact->name) && isset($contact->email) && isset($contact->subject) && isset($contact->message)) {
$name = htmlspecialchars($contact->name, ENT_QUOTES, 'UTF-8');
$email = filter_var($contact->email, FILTER_VALIDATE_EMAIL);
$subject = htmlspecialchars($contact->subject, ENT_QUOTES, 'UTF-8');
$message = htmlspecialchars($contact->message, ENT_QUOTES, 'UTF-8');

if ($email !== false) {
echo "Thanks for the message, $name!";
} else {
echo "Invalid email address!";
}
} else {
echo "Invalid XML format!";
}