CVE-2020-25684

A flaw was found in dnsmasq before version 2.83. When getting a reply from
a forwarded query, dnsmasq checks in the forward.c:reply_query() if the
reply destination address/port is 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 issue contrasts with RFC5452, which specifies a query’s
attributes that all must be used to match a reply. This flaw allows an
attacker to perform a DNS Cache Poisoning attack. If chained with
CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful
attack is reduced. The highest threat from this vulnerability is to data
integrity.