CVE-2020-10995
Fixed in a distro release EPSS 4%
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.
Products: powerdns recursor, fedoraproject fedora, debian_linux, opensuse backports_sle, opensuse leap
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Arch Linux | powerdns-recursor | 4.2.2-1 |
| Debian 10 | pdns-recursor | 4.1.11-1+deb10u1 |
| Debian 12 | pdns-recursor | 4.3.1-1 |
| Debian 13 | pdns-recursor | 4.3.1-1 |
| Debian 14 | pdns-recursor | 4.3.1-1 |
| SUSE Package Hub 12 SP1 | pdns-recursor | 4.1.12-bp151.4.3.1 |
| SUSE Package Hub 15 SP1 | pdns-recursor | 4.1.12-bp151.4.3.1 |
| Ubuntu Pro 16.04 LTS | pdns-recursor | no fix |
| Ubuntu Pro 18.04 LTS | pdns-recursor | no fix |
| Ubuntu Pro 20.04 LTS | pdns-recursor | no fix |
| openSUSE Leap 15.1 | pdns-recursor | 4.1.12-bp151.4.3.1 |
| openSUSE Tumbleweed | pdns-recursor | 4.5.5-1.3 |