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Potential CVE-2023-2640 or CVE-2023-32629 - Overlay

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Summary
This detection rule focuses on identifying potential exploitation attempts related to privilege escalation vulnerabilities, specifically CVE-2023-2640 and CVE-2023-32629, found in the OverlayFS module on Ubuntu systems. The rule leverages a correlation of various events related to process execution such as the use of 'unshare', 'setcap' with 'cap_sys_admin', and the 'mount' command invoking overlay capabilities. The intent is to detect when an attacker may be attempting to manipulate system capabilities and the filesystem overlay functionality to elevate privileges without authorization. By analyzing event logs, particularly Linux audit logs, the rule aims to provide timely alerts for potential real-time exploitation of these CVEs, ensuring that system administrators can react promptly to potential security incidents.
Categories
  • Linux
  • Endpoint
Data Sources
  • Process
  • File
  • Logon Session
ATT&CK Techniques
  • T1548
Created: 2024-02-09