"unused bit attack"
Our Team discovered one problem,
in some case it's simple,
but it could be serious problem of security
in the programming related with tcp/ip.
In fact, TCP header is 6 kinds of
tcp flag (SYN, ACK, PSH, RST, FIN, URG).
problem is the flag value in TCP header
approaches to 1byte variable of u_char type.
ex)see tcp.h file
The flag value Each one correspond to 1 bit,
but it have unused 2 bit.