PowerDNS Security Advisory 2019-05: Denial of service via NOTIFY packets

• CVE: CVE-2019-10163
• Date: June 21st 2019
• Affects: PowerDNS Authoritative up to and including 4.1.8
• Not affected: 4.1.9, 4.0.8
• Severity: Medium
• Impact: Denial of Service
• Exploit: This problem can be triggered via the sending of NOTIFY packets from an authorized master
• Risk of system compromise: No
• Solution: Upgrade to a non-affected version

An issue has been found in PowerDNS Authoritative Server allowing a remote, authorized master server to cause a high CPU load or even prevent any further updates to any slave zone by sending a large number of NOTIFY messages. Note that only servers configured as slaves are affected by this issue.

This issue has been assigned CVE-2019-10163.

PowerDNS Authoritative up to and including 4.1.8 is affected. Please note that at the time of writing, PowerDNS Authoritative 3.4 and below are no longer supported, as described in https://doc.powerdns.com/authoritative/appendices/EOL.html.

We would like to thank George Asenov for finding and subsequently reporting this issue!