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CVE-2020-25684

A flaw was found in dnsmasq before version 2.83.

Impact

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.

Affected products

VendorProductAffected versions
ThekelleysDnsmasq
before 2.83
FedoraprojectFedora
Versions 32, 33
DebianDebian Linux
Versions 9.0, 10.0
AristaEos
from 4.21 before 4.21.14m
from 4.22 before 4.22.9m
from 4.23 before 4.23.7m
from 4.24 before 4.24.5m
from 4.25 before 4.25.2f

Weakness classification

CWE-358

References