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How the CVE Works
The vulnerability arises when Cilium processes traffic from terminating endpoints while using WireGuard transparent encryption. Due to a race condition, packets may bypass encryption and leave the source node unencrypted. This occurs because Cilium fails to properly synchronize WireGuard encryption with endpoint termination events, allowing unencrypted traffic to leak before the encryption context is fully applied. Attackers intercepting such traffic could read sensitive data, leading to potential data breaches or MITM attacks.
DailyCVE Form
Platform: Cilium
Version: v1.15.0-v1.17.2
Vulnerability: Race Condition
Severity: Critical
Date: 2024-XX-XX
What Undercode Say:
Exploitation Analysis
- Attackers intercept unencrypted traffic from terminating pods.
- Exploits race condition during WireGuard handshake.
- Requires network access to vulnerable Cilium cluster.
Detection Commands
kubectl get pods -n kube-system -l k8s-app=cilium cilium status --verbose | grep -i wireguard
Exploitation Proof-of-Concept (PoC)
tcpdump -i eth0 'host <TARGET_POD_IP>' -w unencrypted_traffic.pcap
Mitigation Steps
1. Patch Immediately:
helm upgrade cilium cilium/cilium --version 1.17.3
2. Network Policies:
apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
name: block-unencrypted-traffic
spec:
endpointSelector: {}
egress:
- toEntities:
- cluster
- toPorts:
- ports:
- port: "51820"
protocol: UDP
Monitoring & Logging
cilium monitor --type drop journalctl -u cilium -f | grep -i wireguard
Additional Hardening
- Disable WireGuard if not required:
helm upgrade cilium --set encryption.enabled=false
- Enable audit logging for Cilium:
kubectl edit cm cilium-config -n kube-system
Add:
debug: "true" monitor-aggregation: "none"
References
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
