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CVE-2020-25686

A flaw was found in dnsmasq before version 2.83.

Impact

A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, 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
Version 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-358CWE-290

References