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Vulnerability · Published May 19, 2020 · Assigned by mitre

CVE-2020-10995

High 7.5

In plain English

A high-severity security flaw in the pdns-recursor package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.5% (higher than 92% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.5High
Exploit odds (30 days)4.5%top 8.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20pdns-recursor4.3.1-r0ALPINE-CVE-2020-10995
Alpine:v3.21pdns-recursor4.3.1-r0ALPINE-CVE-2020-10995
Alpine:v3.22pdns-recursor4.3.1-r0ALPINE-CVE-2020-10995
Alpine:v3.23pdns-recursor4.3.1-r0ALPINE-CVE-2020-10995
Alpine:v3.24pdns-recursor4.3.1-r0ALPINE-CVE-2020-10995
Debian:12pdns-recursor4.3.1-1DEBIAN-CVE-2020-10995
Debian:13pdns-recursor4.3.1-1DEBIAN-CVE-2020-10995
Debian:14pdns-recursor4.3.1-1DEBIAN-CVE-2020-10995

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References