'Return the the vuln. type secured by securing function `sfname`.
:param sfname: Securing function name'

@staticmethod
def get_vulnty_for_sec(sfname):

    for (vulnty, sfnames) in FuncCall.SFDB.iteritems():
        if any(((sfname == sfn) for sfn in sfnames)):
            return vulnty
    return None
