Chapter 11 "Flash Security" of "AdvancED Flex 4" by S. Tiwari and E. Elrom
Code:
http://www.amazon.com/AdvancED-Flex-4-Shashank-Tiwari/dp/1430224835/ref=ntt_at_ep_dpt_3
Discusses some of the vulnerabilities, showing examples of how an attacker can abuse Flash or Flex applications.
Code:
http://www.multiupload.com/64NYA5SW6P