Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Powerdns | Recursor | >= 4.1.0, <= 4.3.0 |
| Fedoraproject | Fedora | 31 |
| Debian | Debian Linux | 10.0 |
| Opensuse | Backports Sle | 15.0 |
| Opensuse | Leap | 15.1 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00052.htmlMailing ListThird Party Advisory
- http://www.nxnsattack.comTechnical DescriptionThird Party Advisory
- https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-01.Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.debian.org/security/2020/dsa-4691Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00052.htmlMailing ListThird Party Advisory
- http://www.nxnsattack.comTechnical DescriptionThird Party Advisory
- https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-01.Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.debian.org/security/2020/dsa-4691Third Party Advisory
FAQ
What is CVE-2020-10995?
CVE-2020-10995 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 recur...
How severe is CVE-2020-10995?
CVE-2020-10995 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-10995?
Check the references section above for vendor advisories and patch information. Affected products include: Powerdns Recursor, Fedoraproject Fedora, Debian Debian Linux, Opensuse Backports Sle, Opensuse Leap.