Kubernetes Pod Created With HostPID

 1[metadata]
 2creation_date = "2022/07/05"
 3integration = ["kubernetes"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10This rule detects an attempt to create or modify a pod attached to the host PID namespace. HostPID allows a pod to
11access all the processes running on the host and could allow an attacker to take malicious action. When paired with
12ptrace this can be used to escalate privileges outside of the container. When paired with a privileged container, the
13pod can see all of the processes on the host. An attacker can enter the init system (PID 1) on the host. From there,
14they could execute a shell and continue to escalate privileges to root.
15"""
16false_positives = [
17    """
18    An administrator or developer may want to use a pod that runs as root and shares the hosts IPC, Network, and PID
19    namespaces for debugging purposes. If something is going wrong in the cluster and there is no easy way to SSH onto
20    the host nodes directly, a privileged pod of this nature can be useful for viewing things like iptable rules and
21    network namespaces from the host's perspective. Add exceptions for trusted container images using the query field
22    "kubernetes.audit.requestObject.spec.container.image"
23    """,
24]
25index = ["logs-kubernetes.*"]
26language = "kuery"
27license = "Elastic License v2"
28name = "Kubernetes Pod Created With HostPID"
29note = """## Setup
30
31The Kubernetes Fleet integration with Audit Logs enabled or similarly structured data is required to be compatible with this rule."""
32references = [
33    "https://research.nccgroup.com/2021/11/10/detection-engineering-for-kubernetes-clusters/#part3-kubernetes-detections",
34    "https://kubernetes.io/docs/concepts/security/pod-security-policy/#host-namespaces",
35    "https://bishopfox.com/blog/kubernetes-pod-privilege-escalation",
36]
37risk_score = 47
38rule_id = "df7fda76-c92b-4943-bc68-04460a5ea5ba"
39severity = "medium"
40tags = ["Data Source: Kubernetes", "Tactic: Execution", "Tactic: Privilege Escalation"]
41timestamp_override = "event.ingested"
42type = "query"
43
44query = '''
45event.dataset : "kubernetes.audit_logs"
46  and kubernetes.audit.annotations.authorization_k8s_io/decision:"allow"
47  and kubernetes.audit.objectRef.resource:"pods"
48  and kubernetes.audit.verb:("create" or "update" or "patch")
49  and kubernetes.audit.requestObject.spec.hostPID:true
50  and not kubernetes.audit.requestObject.spec.containers.image: ("docker.elastic.co/beats/elastic-agent:8.4.0")
51'''
52
53
54[[rule.threat]]
55framework = "MITRE ATT&CK"
56[[rule.threat.technique]]
57id = "T1611"
58name = "Escape to Host"
59reference = "https://attack.mitre.org/techniques/T1611/"
60
61
62[rule.threat.tactic]
63id = "TA0004"
64name = "Privilege Escalation"
65reference = "https://attack.mitre.org/tactics/TA0004/"
66[[rule.threat]]
67framework = "MITRE ATT&CK"
68[[rule.threat.technique]]
69id = "T1610"
70name = "Deploy Container"
71reference = "https://attack.mitre.org/techniques/T1610/"
72
73
74[rule.threat.tactic]
75id = "TA0002"
76name = "Execution"
77reference = "https://attack.mitre.org/tactics/TA0002/"