Elastic Security Detection Rules

Potential Privilege Escalation via OverlayFS

Last updated 6 months ago on 2025-02-04
Created 2 years ago on 2023-07-28

About

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.
Tags
Domain: EndpointOS: LinuxUse Case: Threat DetectionTactic: Privilege EscalationUse Case: VulnerabilityData Source: Elastic DefendLanguage: eql
Severity
high
Risk Score
73
MITRE ATT&CK™

Privilege Escalation (TA0004)(opens in a new tab or window)

↳ Exploitation for Privilege Escalation (T1068)(opens in a new tab or window)

License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
logs-endpoint.events.process*
Related Integrations

endpoint(opens in a new tab or window)

Query
sequence by process.parent.entity_id, host.id with maxspan=5s
  [process where host.os.type == "linux" and event.type == "start" and event.action == "exec" 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"]

Install detection rules in Elastic Security

Detect Potential Privilege Escalation via OverlayFS in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).