I would consider using a custom (extending the existing) AuthorizeFilter that sets the ActionResult on the AuthorizationContext to redirect to your change password action if the user is authenticated but the password is expired. This would allow them to login normally, but restrict them to only that action if their password is expired. I use a similar approach in one of my apps that redirects a person to an event enrollment page if they are registered with the site but haven't signed up for an event yet (it's a charity event management app).
How about creating a custom AuthorizationAttribute and overriding the OnAuthorization method Sample code here: http://stackoverflow.com/questions/554094/asp-net-mvc-adding-to-the-authorize-attribute .
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