DNS Cache Poisoning

apport is vulnerable to DNS cache poisoning. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query() if the reply destination address/port is one of those used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies the attributes of a query that all must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack.