Index: wp-pass.php
===================================================================
--- wp-pass.php	(revision 6130)
+++ wp-pass.php	(working copy)
@@ -7,5 +7,5 @@
 // 10 days
 setcookie('wp-postpass_' . COOKIEHASH, $_POST['post_password'], time() + 864000, COOKIEPATH);
 
-wp_redirect(wp_get_referer());
+wp_safe_redirect(wp_get_referer());
 ?>
\ No newline at end of file
Index: wp-login.php
===================================================================
--- wp-login.php	(revision 6130)
+++ wp-login.php	(working copy)
@@ -78,7 +78,7 @@
 	if ( isset( $_REQUEST['redirect_to'] ) )
 		$redirect_to = $_REQUEST['redirect_to'];
 
-	wp_redirect($redirect_to);
+	wp_safe_redirect($redirect_to);
 	exit();
 
 break;
@@ -324,7 +324,7 @@
 			if ( !$using_cookie )
 				wp_setcookie($user_login, $user_pass, false, '', '', $rememberme);
 			do_action('wp_login', $user_login);
-			wp_redirect($redirect_to);
+			wp_safe_redirect($redirect_to);
 			exit();
 		} else {
 			if ( $using_cookie )
Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(revision 6130)
+++ wp-includes/pluggable.php	(working copy)
@@ -399,6 +399,24 @@
 }
 endif;
 
+if ( !function_exists('wp_safe_redirect') ) :
+/**
+ * performs a safe (local) redirect, using wp_redirect()
+ * @return void
+ **/
+function wp_safe_redirect($location, $status = 302) {
+	if ( $location{0} == '/' ) {
+		if ( $location{1} == '/' )
+			$location = get_option('home') . '/';
+	} else {
+		if ( substr($location, 0, strlen(get_option('home'))) != get_option('home') )
+			$location = get_option('home') . '/';
+	}
+
+	wp_redirect($location, $status);
+}
+endif;
+
 if ( !function_exists('wp_get_cookie_login') ):
 function wp_get_cookie_login() {
 	if ( empty($_COOKIE[USER_COOKIE]) || empty($_COOKIE[PASS_COOKIE]) )