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CVE-2025-3744: Nomad Enterprise Policy Override Vulnerability

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Overview

This report discusses a critical vulnerability, CVE-2025-3744, that affects Nomad Enterprise. This software vulnerability allows jobs to bypass the mandatory sentinel policies when using the policy override option. The implications of this vulnerability are severe, potentially leading to system compromise or data leakage. It is, therefore, crucial to understand and mitigate this risk.

Vulnerability Summary

CVE ID: CVE-2025-3744
Severity: High (CVSS: 7.6)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

Nomad Enterprise | 1.10.0 and below
Nomad Enterprise | 1.9.8 and below
Nomad Enterprise | 1.8.12 and below

How the Exploit Works

The vulnerability, CVE-2025-3744, lies in the policy override option of Nomad Enterprise. When this option is enabled, jobs can bypass the mandatory sentinel policies, creating a security loophole. This bypass can potentially allow unauthorized access to the system or data, leading to possible system compromise or data leakage.

Conceptual Example Code

The following pseudocode illustrates how this vulnerability might be exploited:

# Using Nomad job file with policy override option
nomad job run -policy-override exploit.nomad

In this conceptual example, an attacker could craft a `exploit.nomad` job file with malicious intent, then use the `-policy-override` option to bypass the sentinel policies, potentially gaining unauthorized access to the system or data.

Mitigation Guidance

It is highly recommended to apply the vendor-provided patches to mitigate this vulnerability. The patches for this vulnerability are present in the Nomad Enterprise versions 1.10.1, 1.9.9, and 1.8.13. If patching is not immediately possible, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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