Hi,
Those are not CMS pages so there is no left and right content associated with them. If you have something in your layout.master file in the side columns that you want to always show, you can set AlwaysShowLeftColumn="true" and AlwaysShowRightColumn="true" on <portal:StylesheetCombiner in your layout.master file.
My advice is that security related pages like the login page should not have additional content on them for best practices and really any content other than graphics or ads that is duplicated on lots of pages is bad for SEO. Usability is also better when users are not distracted by other things than the task for which the page is intended ie login, registration, search or sitemap.
Best,
Joe