[New Rule] Potential Container Escape via Modified notify_on_release File (#3244)

* [New Rule] Potential Container Escape via Modified notify_on_release File This rule detects modification of the cgroup notify_on_release file from inside a container. When the notify_on_release flag is enabled (1) in a cgroup, then whenever the last task in the cgroup exits or attaches to another cgroup, the command specified in the release_agent file is run and invoked from the host. A privileged container with SYS_ADMIN capabilities, enables a threat actor to mount a cgroup directory and modify the notify_on_release flag in order to take advantage of this feature, which could be used for further privilege escalation and container escapes to the host machine. * Apply suggestions from code review * suggestions from code review Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com> --------- Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com> Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>
2024-01-04 22:14:39 -05:00
parent 0a37df713b
commit 8e1dad0aeb
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+[metadata]
+creation_date = "2023/10/26"
+integration = ["cloud_defend"]
+maturity = "production"
+min_stack_comments = "New Integration: Cloud Defend"
+min_stack_version = "8.8.0"
+updated_date = "2023/12/18"
+
+[rule]
+author = ["Elastic"]
+description = """
+This rule detects modification of the cgroup notify_on_release file from inside a container. When the notify_on_release
+flag is enabled (1) in a cgroup, then whenever the last task in the cgroup exits or attaches to another cgroup, the
+command specified in the release_agent file is run and invoked from the host. A privileged container with SYS_ADMIN
+capabilities, enables a threat actor to mount a cgroup directory and modify the notify_on_release flag in order to take
+advantage of this feature, which could be used for further privilege escalation and container escapes to the host
+machine.
+"""
+from = "now-6m"
+index = ["logs-cloud_defend*"]
+interval = "5m"
+language = "eql"
+license = "Elastic License v2"
+name = "Potential Container Escape via Modified notify_on_release File"
+references = [
+    "https://blog.trailofbits.com/2019/07/19/understanding-docker-container-escapes/",
+    "https://sysdig.com/blog/detecting-mitigating-cve-2022-0492-sysdig/",
+]
+risk_score = 73
+rule_id = "ef65e82c-d8b4-4895-9824-5f6bc6166804"
+severity = "high"
+tags = [
+    "Data Source: Elastic Defend for Containers",
+    "Domain: Container",
+    "OS: Linux",
+    "Use Case: Threat Detection",
+    "Tactic: Privilege Escalation",
+]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+file where event.module == "cloud_defend" and event.action == "open" and 
+event.type == "change" and file.name : "notify_on_release"
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1611"
+name = "Escape to Host"
+reference = "https://attack.mitre.org/techniques/T1611/"
+
+
+[rule.threat.tactic]
+id = "TA0004"
+name = "Privilege Escalation"
+reference = "https://attack.mitre.org/tactics/TA0004/"
+