Input validation error in PowerDNS Recursor - CVE-2020-10995

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Main Vulnerability Database Vulnerabilities #VU28141

Input validation error in PowerDNS Recursor - CVE-2020-10995

Published: May 20, 2020


Vulnerability identifier: #VU28141
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-10995
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing DNS responses. A remote attacker who controls a malicious DNS server can send a specially crafted response and perform a denial of service (DoS) attack against third-party DNS servers.

The attack is triggered by random subdomains in the NSDNAME in NS records.


Affected software

PowerDNS Recursor
Arch Linux
Fedora
SUSE Linux
Opensuse
pdns-recursor (Debian package)
pdns-recursor (Alpine package)
pdns-recursor
SUSE Package Hub for SUSE Linux Enterprise

How to mitigate CVE-2020-10995

Install updates from vendor's website.

PowerDNS Recursor - addressed in versions 4.1.16, 4.2.2, 4.3.1
pdns-recursor (Debian package) - update to 4.1.11-1+deb10u1
pdns-recursor (Alpine package) - update to 4.1.16-r0
pdns-recursor - addressed in versions 4.1.16-1.el7, 4.2.2-1.el8, 4.2.2-1.fc31, 4.3.1-1.fc32

External References

Related Security Bulletins