As of quinn-proto 0.11, it is possible for a server to accept(), retry(), refuse(), or ignore() an Incoming connection. However, calling retry() on an unvalidated connection exposes the server to a likely panic in the following situations:
refuse or ignore on the resulting validated connection, if a duplicate initial packet is received
refuse()/ignore() code path is exercised, such as to stop a denial of service attack.The former situation was observed in a real application, while the latter is only theoretical.
Location of panic: https://github.com/quinn-rs/quinn/blob/bb02a12a8435a7732a1d762783eeacbb7e50418e/quinn-proto/src/endpoint.rs#L213
Denial of service for internet-facing server
{
"severity": "HIGH",
"nvd_published_at": "2024-09-02T18:15:37Z",
"github_reviewed": true,
"cwe_ids": [
"CWE-670"
],
"github_reviewed_at": "2024-09-03T20:49:26Z"
}