Recent advances in buffer-overflow protection are able to eliminate several common types of buffer-overflow attacks (e.g. stack smashing, jump table). In this paper, we introduce arbitrary copy, a type of buffer-overflow attack that is capable of bypassing most buffer-overflow solutions. By overflowing both source and destination pointers of any string copy (or similar) function, arbitrary copy is able to utilize a useful local address for attacking a system. This method can bypass even the most promising buffer-overflow protection that enforces the integrity of address such as secure bit (Piromsopa and Enbody, 2006) and MINOS (Crandal and Chong, 2004). Later, we analyze conditions necessary for the success of this attack. Though satisfying all necessary conditions for this attack should be difficult, our conclusion is that it is a potential threat and requires consideration