Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2020-10995

Published: 19 May 2020

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
pdns-recursor
Launchpad, Ubuntu, Debian
impish Not vulnerable
(4.3.1-1)
focal Needs triage

hirsute Not vulnerable
(4.3.1-1)
xenial Needs triage

jammy Not vulnerable
(4.3.1-1)
kinetic Not vulnerable
(4.3.1-1)
lunar Not vulnerable
(4.3.1-1)
bionic Needs triage

eoan Ignored
(end of life)
groovy Not vulnerable
(4.3.1-1)
trusty Does not exist

upstream Needs triage

mantic Not vulnerable
(4.3.1-1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H