[New Rule] Potential Container Escape via Modified release_agent File (#3242)

* [New Rule] Potential Container Escape via Modified release_agent File This rule detects modification of the CGroup release_agent file from inside a privileged container. The release_agent is a script that is executed at the termination of any process on that CGroup and is invoked from the host. A privileged container with SYS_ADMIN capabilities, enables a threat actor to mount a CGroup directory and modify the release_agent which could be used for further privilege escalation and container escapes to the host machine. * Apply 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 21:24:54 -05:00
parent d7b62395e7
commit 0a37df713b
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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 = "2023/12/14"
+
+[rule]
+author = ["Elastic"]
+description = """
+This rule detects modification of the CGroup release_agent file from inside a privileged container. The release_agent is
+a script that is executed at the termination of any process on that CGroup and is invoked from the host. A privileged
+container with SYS_ADMIN capabilities, enables a threat actor to mount a CGroup directory and modify the release_agent
+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 release_agent File"
+references = [
+    "https://blog.aquasec.com/threat-alert-container-escape",
+    "https://sysdig.com/blog/detecting-mitigating-cve-2022-0492-sysdig/",
+    "https://book.hacktricks.xyz/linux-hardening/privilege-escalation/docker-security/docker-breakout-privilege-escalation#privileged-escape-abusing-existent-release_agent-cve-2022-0492-poc1",
+]
+risk_score = 47
+rule_id = "160896de-b66f-42cb-8fef-20f53a9006ea"
+severity = "medium"
+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 : "release_agent"
+'''
+
+
+[[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/"
+