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SecureFlag
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Overview
The secure flag is an option that can be set by the application server when sending a new cookie to the user within an HTTP Response. The purpose of the secure flag is to prevent cookies from being observed by unauthorized parties due to the transmission of a the cookie in clear text.
To accomplish this goal, browsers which support the secure flag will only send cookies with the secure flag when the request is going to a HTTPS page. Said in another way, the browser will not send a cookie with the secure flag set over an unencrypted HTTP request.
By setting the secure flag, the browser will prevent the transmission of a cookie over an unencrypted channel.
Setting the Secure Flag
ASP.NET
<httpCookies requireSSL="true" />
Testing for the Secure Flag
Related Articles
Testing for Cookie Attributes
http://www.troyhunt.com/2011/11/owasp-top-10-for-net-developers-part-9.html
