NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.
Weakness
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Nsd | Nlnetlabs | 4.13.0 (including) | 4.14.3 (excluding) |
| Nsd | Ubuntu | esm-apps/resolute | * |
| Nsd | Ubuntu | questing | * |
| Nsd | Ubuntu | resolute | * |