ICMP control

Do not allow scanning tools to use ICMP for scanning the network.

Narrative

The Internet Control Message Protocol (ICMP) allows Internet hosts to notify each other of errors and allows diagnostics and troubleshooting for system administrators. Because ICMP can also be used by a potential adversary to perform reconnaissance against a target network, and due to historical denial-of-service bugs in broken implementations of ICMP, some network administrators block all ICMP traffic as a network hardening measure

Attack Scenario

Adversaries may use scanning tools that utilize Internet Control Message Protocol (ICMP) to perform reconnaissance against a target network and identify potential loopholes. It's crucial to monitor network traffic and take proactive measures to prevent these attacks from occurring, such as implementing proper firewall rules and network segmentation. Additionally, it's important to stay up-to-date with the latest security patches to prevent known vulnerabilities from being exploited.
Attack Type Network Flood, DoS(Denial of Service)
Actual Attack Ping of Death(PoD)

Compliance

• ICMP Control

Policy

ICMP Control

apiVersion: security.kubearmor.com/v1
kind: KubeArmorPolicy
metadata:
  name: restrict-scanning-tools
  namespace: default
spec:
  severity: 4
  selector:
    matchLabels:
      app: nginx
  network:
    matchProtocols:
    - protocol: icmp
      fromSource:
      - path: /usr/bin/ping
    - protocol: udp
      fromSource:
      - path: /usr/bin/ping
  action: Allow
  message: Scanning tool has been detected

Simulation

kubectl exec -it nginx-77b4fdf86c-x7sdm -- bash
root@nginx-77b4fdf86c-x7sdm:/# hping3 www.google.com
Unable to resolve 'www.google.com'
root@nginx-77b4fdf86c-x7sdm:/# hping3 127.0.0.1
Warning: Unable to guess the output interface
[get_if_name] socket(AF_INET, SOCK_DGRAM, 0): Permission denied
[main] no such device
root@nginx-77b4fdf86c-x7sdm:/# ping google.com
PING google.com (216.58.200.206) 56(84) bytes of data.
64 bytes from nrt12s12-in-f206.1e100.net (216.58.200.206): icmp_seq=1 ttl=109 time=51.9 ms
64 bytes from nrt12s12-in-f206.1e100.net (216.58.200.206): icmp_seq=2 ttl=109 time=60.1 ms
^C
--- google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 51.917/56.005/60.094/4.088 ms

Expected Alert

{
  "Action": "Block",
  "ClusterName": "0-trust",
  "ContainerID": "20a6333c6a46e0da32b3062f0ba76e9aed4fc5ef51f5ee8aec5b980963cedea3",
  "ContainerImage": "docker.io/library/nginx:latest@sha256:32da30332506740a2f7c34d5dc70467b7f14ec67d912703568daff790ab3f755",
  "ContainerName": "nginx",
  "Data": "syscall=SYS_SOCKET",
  "Enforcer": "AppArmor",
  "HostName": "aditya",
  "HostPID": 86904,
  "HostPPID": 86860,
  "Labels": "app=nginx",
  "NamespaceName": "default",
  "Operation": "Network",
  "Owner": {
    "Name": "nginx",
    "Namespace": "default",
    "Ref": "Deployment"
  },
  "PID": 1064,
  "PPID": 1058,
  "ParentProcessName": "/usr/bin/bash",
  "PodName": "nginx-77b4fdf86c-x7sdm",
  "PolicyName": "DefaultPosture",
  "ProcessName": "/usr/sbin/hping3",
  "Resource": "domain=AF_INET type=SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC protocol=0",
  "Result": "Permission denied",
  "Source": "/usr/sbin/hping3 www.google.com",
  "Timestamp": 1696593032,
  "Type": "MatchedPolicy",
  "UpdatedTime": "2023-10-06T11:50:32.098937Z",
  "cluster_id": "4291",
  "component_name": "kubearmor",
  "instanceGroup": "0",
  "instanceID": "0",
  "tenant_id": "167",
  "workload": "1"
}