The XPC Services API in LaunchServices in Apple iOS before 9.3 allows attackers to bypass intended event-handler restrictions and modify an arbitrary apps events via a crafted app.
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
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Access control involves the use of several protection mechanisms such as:
When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses: