CVE-2024-8418

What it actually does

The server processes TCP DNS queries serially and does not enforce connection timeouts, allowing a single client to hold a TCP connection open indefinitely and starve the listener thread so that subsequent legitimate queries are queued or dropped.

Why it matters to the business

DNS resolution becomes unavailable for containers and dependent services, producing widespread application outages and operational downtime until the affected process is restarted or the connection is terminated.

How an attack unfolds

An attacker opens a TCP connection to the aardvark-dns listener and simply keeps the socket open without sending further data or closing it; because queries are handled one at a time, every other client experiences timeouts and resolution failures.

How to fix it

Upgrade to the next patched release of aardvark-dns once published; until then apply network-level controls that limit concurrent TCP connections per source IP or enforce aggressive idle timeouts on the DNS listener.

How to confirm the fix worked

Confirm the listener no longer accepts new TCP connections while an idle connection is held, or verify that query latency remains within expected bounds under load after the upgrade or mitigation is applied.

Typical attack path

1. Discover an exposed aardvark-dns TCP listener (port 53 or custom).
2. Establish a single TCP connection and leave it idle.
3. Observe that subsequent DNS queries from other clients time out or are dropped.
4. Maintain the connection to sustain the denial-of-service condition.

How to detect it

Review logs for sustained TCP connections to the DNS port that show no query activity after the initial handshake; correlate with spikes in connection table entries for the aardvark-dns process and sudden increases in DNS timeout errors reported by clients.

What your security team should do

• Prioritize deployment of the forthcoming fixed aardvark-dns package across all container hosts.
• Add connection-rate and idle-timeout rules at the host firewall or container network layer.
• Monitor DNS query success rates and TCP connection counts for the aardvark-dns process.