Resource exhaustion in Powerdns Recursor
CVE-2020-10995
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.044 (90.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.044 · newest: 0.044 · change: 0.000
Affected products
- Powerdns Recursor
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 31, 32
- openSUSE Backports Sle — versions 15.0
- openSUSE Leap — versions 15.1
Weakness classification (CWE)
References
- www.nxnsattack.com (Technical Description, Third Party Advisory)
- doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-01.html (Vendor Advisory)
- www.debian.org/security/2020/dsa-4691 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-05/msg00052.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-10995?
- CVE-2020-10995 is a high-severity vulnerability in Powerdns Recursor, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-05-19.
- How severe is CVE-2020-10995?
- High severity. CVSS v3 base score is 7.5 out of 10.