An issue has been found in the parsing of authoritative answers in PowerDNS Recursor before 4.0.8, leading to a NULL pointer dereference when parsing a specially crafted answer containing a CNAME of a different class than IN. An unauthenticated remote attacker could cause a denial of service.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Recursor | Powerdns | * | 4.0.8 (excluding) |
| Pdns-recursor | Ubuntu | artful | * |
| Pdns-recursor | Ubuntu | esm-apps/xenial | * |
| Pdns-recursor | Ubuntu | upstream | * |
| Pdns-recursor | Ubuntu | xenial | * |
| Pdns-recursor | Ubuntu | zesty | * |