Index: wp-includes/post-template.php
===================================================================
--- wp-includes/post-template.php	(revision 19728)
+++ wp-includes/post-template.php	(working copy)
@@ -1222,7 +1222,7 @@
 function get_the_password_form() {
 	global $post;
 	$label = 'pwbox-' . ( empty($post->ID) ? rand() : $post->ID );
-	$output = '<form action="' . site_url('wp-pass.php') . '" method="post">
+	$output = '<form action="' . esc_url( site_url( 'wp-login.php?action=postpass', 'login_post' ) ) . '" method="post">
 	<p>' . __("This post is password protected. To view it please enter your password below:") . '</p>
 	<p><label for="' . $label . '">' . __("Password:") . ' <input name="post_password" id="' . $label . '" type="password" size="20" /></label> <input type="submit" name="Submit" value="' . esc_attr__("Submit") . '" /></p>
 	</form>
Index: wp-login.php
===================================================================
--- wp-login.php	(revision 19728)
+++ wp-login.php	(working copy)
@@ -339,7 +339,7 @@
 	$action = 'resetpass';
 
 // validate action so as to default to the login screen
-if ( !in_array($action, array('logout', 'lostpassword', 'retrievepassword', 'resetpass', 'rp', 'register', 'login'), true) && false === has_filter('login_form_' . $action) )
+if ( !in_array( $action, array( 'postpass', 'logout', 'lostpassword', 'retrievepassword', 'resetpass', 'rp', 'register', 'login' ), true ) && false === has_filter( 'login_form_' . $action ) )
 	$action = 'login';
 
 nocache_headers();
@@ -367,6 +367,21 @@
 $http_post = ('POST' == $_SERVER['REQUEST_METHOD']);
 switch ($action) {
 
+case 'postpass' :
+	if ( empty( $wp_hasher ) ) {
+		require_once( ABSPATH . 'wp-includes/class-phpass.php' );
+		// By default, use the portable hash from phpass
+		$wp_hasher = new PasswordHash(8, true);
+	}
+
+	// 10 days
+	setcookie( 'wp-postpass_' . COOKIEHASH, $wp_hasher->HashPassword( stripslashes( $_POST['post_password'] ) ), time() + 864000, COOKIEPATH );
+
+	wp_safe_redirect( wp_get_referer() );
+	exit();
+
+break;
+
 case 'logout' :
 	check_admin_referer('log-out');
 	wp_logout();
Index: wp-pass.php
===================================================================
--- wp-pass.php	(revision 19728)
+++ wp-pass.php	(working copy)
@@ -1,22 +0,0 @@
-<?php
-/**
- * Creates the password cookie and redirects back to where the
- * visitor was before.
- *
- * @package WordPress
- */
-
-/** Make sure that the WordPress bootstrap has run before continuing. */
-require( dirname( __FILE__ ) . '/wp-load.php');
-
-if ( empty( $wp_hasher ) ) {
-	require_once( ABSPATH . 'wp-includes/class-phpass.php');
-	// By default, use the portable hash from phpass
-	$wp_hasher = new PasswordHash(8, true);
-}
-
-// 10 days
-setcookie( 'wp-postpass_' . COOKIEHASH, $wp_hasher->HashPassword( stripslashes( $_POST['post_password'] ) ), time() + 864000, COOKIEPATH );
-
-wp_safe_redirect( wp_get_referer() );
-exit;