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layerone.org

LayerOne Information Security Conference - May 23-24, 2026

freedom-to-tinker.com

Recently it was reported that Disney World is fingerprinting its customers. This raised obvious privacy concerns. People wondered why Disney would need that information, and what they were going to do with it. As Eric Rescorla noted, the answer is almost surely price discrimination. Disney sells multi-day tickets at a discount. They don't want people to buy (say) a ten-day ticket, use it for two days, and then resell the ticket to somebody else. Disney makes about $200 more by selling five separate two-day tickets than by selling a single ten-day ticket. To stop this, they fingerprint the users of such tickets and verify that the fingerprint associated with a ticket doesn't change from day to day. Price discrimination often leads to privacy worries, because some price discrimination strategies rely on the ability to identify individual customers so the seller knows what price to charge them. Such privacy worries seem to be intensifying as technology advances, since it is becoming easier to keep records about individual customers, easier to get information about customers from outside sources, and easier to design and manage complex price discrimination strategies. On the other hand, some forms of price discrimination don't depend on identifying customers. For example, early-bird discounts at restaurants cause customers to self-select into categories based on willingness to pay (those willing to come at an inconvenient time to get a lower price vs. those not willing) without needing to identify individuals. Disney's type of price discrimination falls into a middle ground. They don't need to know who you are; all they need to know is that you are the same person who used the ticket yesterday. I think it's possible to build a fingerprint-based system that stores just enough information to verify that a newly-presented fingerprint is the same one seen before, but without storing the fingerprint itself or even information useful in reconstructing or forging it. That woul

thespanner.co.uk

Relative VS Absolute RPO (Relative Path Overwrite) is a technique to take advantage of relative URLs by overwriting their target file. To understand the technique we must first look into the differences between relative and absolute URLs. An absolute URL is basically the full URL for a destination address including the protocol and domain name whereas a relative URL doesn’t specify a domain or protocol and uses the existing destination to determine the protocol and domain. Absolute URL https://hackvertor.co.uk/public Relative URL public/somedirectory The relative URL shown will look for public and automatically include the domain before it based on the current domain name. There are two important variations of a relative URL, the first is we can use the current path and look for a directory within it such as “xyz” or use common directory traversal techniques such as “../xyz”. To see how these work within markup let’s take a look at a common relative URL used within a stylesheet. html The link element above references “style.css” using a relative URL, depending where in the sites directory structure you are it will load the style sheet based on that. For example if you were in a directory called “xyz” then the style sheet would be loaded from “xyz/style.css”. The interesting aspect of this is how the browser knows what a correct path is since it doesn’t have access to the server’s file system. The answer is it doesn’t. There is no way to determine a valid directory structure from outside the file system you can only make educated guesses and use http status codes to determine their existence. The missing styles I noticed something interesting with relative styles, manipulating the path of the site could result in styles failing to load. It occurred to me this was a flaw in some way but the pieces of the jigsaw didn’t make sense yet. How could it be