An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Weakness
The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Bind | Isc | 9.18.36 (including) | 9.18.49 (excluding) |
| Bind | Isc | 9.20.8 (including) | 9.20.23 (excluding) |
| Bind | Isc | 9.21.7 (including) | 9.21.21 (excluding) |
| Red Hat Hardened Images | RedHat | bind-main-9.18.49-1.hum1 | * |
| Bind9 | Ubuntu | devel | * |
| Bind9 | Ubuntu | esm-infra/xenial | * |
| Bind9 | Ubuntu | jammy | * |
| Bind9 | Ubuntu | noble | * |
| Bind9 | Ubuntu | questing | * |
| Bind9 | Ubuntu | resolute | * |
| Bind9 | Ubuntu | upstream | * |