peercoin through 0.6.4 (a chain-based proof-of-stake cryptocurrency) allows a remote denial of service, exploitable by an attacker who acqu…

peercoin through 0.6.4 (a chain-based proof-of-stake cryptocurrency) allows a remote denial of service, exploitable by an attacker who acquires even a small amount of stake/coins in the system. The attacker sends invalid headers/blocks, which are stored on the victim's disk.