RE: Restricting <base> URLS via CSP

Great one. It’s a much needed feature to make CSP more effective.



Sent from Windows Mail


From: Alex Russell
Sent: ‎February‎ ‎28‎, ‎2013 ‎5‎:‎24‎ ‎AM
To: public-web-security@w3.org
CC: Adam Barth, Mike West
Subject: Restricting <base> URLS via CSP


Hi all,



After chatting with Adam and Mike, I'd like to propose a new CSP field for setting a restriction on the base URL of a document. Having this provided in a header and/or early in the page provides a bulwark against many of the worst post-CSS HTML injection attacks, and when combined with existing CSP 1.1 directives can deny many of the worst payload smuggling attacks.




Is there appetite in the group to specify this for 1.1?




Regards