| Package | Affected versions | Patched versions |
|---|---|---|
| authoritative | ≥ 4.0.0, < 4.0.2< 3.4.11 | 4.0.23.4.11 |
| recursor | ≥ 4.0.0, < 4.0.4< 3.7.4 | 4.0.43.7.4 |
An issue has been found in PowerDNS before 3.4.11 and 4.0.2, and PowerDNS recursor before 3.7.4 and 4.0.4, allowing a remote, unauthenticated attacker to cause an abnormal CPU usage load on the PowerDNS server by sending crafted DNS queries, which might result in a partial denial of service if the system becomes overloaded. This issue is based on the fact that the PowerDNS server parses all records present in a query regardless of whether they are needed or even legitimate. A specially crafted query containing a large number of records can be used to take advantage of that behaviour.
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