Microsoft Windows 2003 Server sp2

A component in Microsoft Outlook Express 6 and Windows Mail in Windows Vista does not properly handle certain HTTP headers when processing MHTML protocol URLs, which allows remote attackers to obtain sensitive information from other Internet Explorer domains, aka "URL Parsing Cross Domain Information Disclosure Vulnerability."

Microsoft Windows Server 2003, when time restrictions are in effect for user accounts, generates different error messages for failed login attempts with a valid user name than for those with an invalid user name, which allows context-dependent attackers to determine valid Active Directory account names.