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To investigate #IngressNightmare, Microsoft’s Security Exposure Management and Defender for Cloud provide powerful tools:
✅ ExposureGraphNodes (Advanced Hunting)
✅ Security Explorer (Defender for Cloud)
🔗 Reference: Microsoft Security Blog
You Should Know:
1. Using ExposureGraphNodes for Advanced Hunting
Run this KQL query in Microsoft Defender Advanced Hunting to detect exposed ingress controllers:
[kql]
ExposureGraphNodes
| where ExposureType == “KubernetesIngressExposure”
| where IsPublic == true
| project ClusterName, Namespace, IngressName, PublicIPs, ExposureDetails
[/kql]
### **2. Security Explorer in Defender for Cloud**
Navigate to Defender for Cloud → Security Explorer and use filters:
– ResourceType: Kubernetes
– ExposureType: Ingress
### **3. Manual Verification via kubectl**
For clusters not fully integrated with CSPM, use:
kubectl get ingress --all-namespaces -o json | jq '.items[] | select(.metadata.annotations."nginx.ingress.kubernetes.io/whitelist-source-range" == null) | .metadata.name'
### **4. PowerShell for Azure Kubernetes Checks**
az aks list --query "[].{Name:name,ResourceGroup:resourceGroup}" -o tsv | ForEach-Object {
$cluster, $rg = $_ -split "`t"
az aks get-credentials --name $cluster --resource-group $rg
kubectl get ingress -A | Where-Object { $_ -notmatch "whitelist" }
}
### **5. Linux Command for Network Exposure Check**
nmap -Pn -p 80,443,8080 $(kubectl get ingress -A -o json | jq -r '.items[].status.loadBalancer.ingress[].ip' | sort -u)
## **What Undercode Say:**
The #IngressNightmare scenario highlights misconfigured Kubernetes ingress controllers exposing critical services. Always:
– Restrict ingress with network policies (kubectl apply -f network-policy.yaml)
– Enable Defender for Containers (az aks enable-addons --addons azure-policy -g MyRG -n MyAKS)
– Use Azure Policy to enforce ingress restrictions (az policy assignment create --policy "/providers/Microsoft.Authorization/policyDefinitions/[...]")
– Monitor logs with Azure Sentinel KQL:
KubernetesInventory | where Namespace contains "ingress" | where isempty(Annotations.whitelist-source-range)
## **Expected Output:**
- List of exposed ingress controllers
- Remediation steps via Azure Policy or kubectl patches
- Continuous monitoring via Defender for Cloud alerts
🔗 Further Reading: Kubernetes Hardening Guide
References:
Reported By: Markolauren Ingressnightmare – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
