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Potential Privilege Escalation via OverlayFS

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Potential Privilege Escalation via OverlayFS

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Identifies an attempt to exploit a local privilege escalation (CVE-2023-2640 and CVE-2023-32629) via a flaw in Ubuntu’s modifications to OverlayFS. These flaws allow the creation of specialized executables, which, upon execution, grant the ability to escalate privileges to root on the affected machine.

Rule type: eql

Rule indices:

logs-endpoint.events.*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Privilege Escalation
Use Case: Vulnerability
Data Source: Elastic Defend

Version: 3

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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sequence by process.parent.entity_id, host.id with maxspan=5s
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
    process.name == "unshare" and process.args : ("-r", "-rm", "m") and process.args : "*cap_setuid*"  and user.id != "0"]
  [process where host.os.type == "linux" and event.action == "uid_change" and event.type == "change" and
    user.id == "0"]

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Exploitation for Privilege Escalation
- ID: T1068
- Reference URL: https://attack.mitre.org/techniques/T1068/

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