A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.
CWE: CWE-358 CWE-284
CVSS 2: MEDIUM – 4.3 (Version: 2.0)
CVSS 3: MEDIUM – 4 (Version: 3.1)
Quelle: NVD – CVE-2021-3448
Datum Veröffentlichung: 2021-04-08T23:15Z, Datum letzte Änderung: 2021-05-04T19:14Z