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CVE-2020-10995

PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks.

Impact

PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks. An issue in the DNS protocol has been found that allow malicious parties to use recursive DNS services to attack third party authoritative name servers. The attack uses a crafted reply by an authoritative name server to amplify the resulting traffic between the recursive and other authoritative name servers. Both types of service can suffer degraded performance as an effect. This is triggered by random subdomains in the NSDNAME in NS records. PowerDNS Recursor 4.1.16, 4.2.2 and 4.3.1 contain a mitigation to limit the impact of this DNS protocol issue.

Affected products

VendorProductAffected versions
PowerdnsRecursor
from 4.1.0 through 4.3.0
FedoraprojectFedora
Versions 31, 32
DebianDebian Linux
Version 10.0
OpensuseBackports Sle
Version 15.0
OpensuseLeap
Version 15.1

Weakness classification

CWE-400

References