new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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OWASP Cheat Sheets · all subjects

authorization/deny_by_default

2 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

Deny by default principle

Even when no access control rules are explicitly matched, the application cannot remain neutral when an entity requests access to a resource. The application must always make a decision, whether implicitly or explicitly, to either deny or permit access. Logic errors and mistakes relating to access control may happen, especially when access requirements are complex. An application should be configured to deny access by default rather than relying entirely on explicitly defined rules for matching all possible requests.

Deny by default mentality and configuration

Adopt a 'deny-by-default' mentality both during initial development and whenever new functionality or resources are exposed by the app. One should be able to explicitly justify why a specific permission was granted to a particular user or group rather than assuming access to be the default position. Although some frameworks or libraries may themselves adopt a deny-by-default strategy, explicit configuration should be preferred over relying on framework or library defaults. The logic and defaults of third-party code may evolve over time, without the developer's full knowledge or understanding of the change's implications for a particular project.

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