A remote attacker might be able to cause infinite recursion in PowerDNS Recursor 4.8.0 via a DNS query that retrieves DS records for a misconfigured domain, because QName minimization is used in QM fallback mode. This is fixed in 4.8.1.
Weakness
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Recursor | Powerdns | 4.8.0 (including) | 4.8.0 (including) |
| Pdns-recursor | Ubuntu | bionic | * |
| Pdns-recursor | Ubuntu | focal | * |
| Pdns-recursor | Ubuntu | kinetic | * |
| Pdns-recursor | Ubuntu | lunar | * |
| Pdns-recursor | Ubuntu | trusty | * |
| Pdns-recursor | Ubuntu | upstream | * |
| Pdns-recursor | Ubuntu | xenial | * |
Potential Mitigations
Related Attack Patterns
References
- http://www.openwall.com/lists/oss-security/2023/01/20/1
- https://docs.powerdns.com/recursor/changelog/4.8.html#change-4.8.1
- https://docs.powerdns.com/recursor/security-advisories/
- http://www.openwall.com/lists/oss-security/2023/01/20/1
- https://docs.powerdns.com/recursor/changelog/4.8.html#change-4.8.1
- https://docs.powerdns.com/recursor/security-advisories/