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CVE-2025-52574: Unrestricted File Access in SysmonElixir System Monitor

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Overview

This report discusses the critical vulnerability CVE-2025-52574, affecting the system monitor HTTP service, SysmonElixir. The vulnerability could allow potential attackers unauthorized access to sensitive system files, potentially leading to system compromise or data leakage. The implications of this vulnerability are significant, as it directly impacts the security of systems running vulnerable versions of SysmonElixir.

Vulnerability Summary

CVE ID: CVE-2025-52574
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Unauthorized access to sensitive system files potentially leading to system compromise or data leakage.

Affected Products

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Product | Affected Versions

SysmonElixir | Prior to 1.0.1

How the Exploit Works

The vulnerability lies in the /read HTTP endpoint of SysmonElixir. In versions prior to 1.0.1, this endpoint allows unrestricted reading of any file from the server’s /etc/passwd directory by default. An attacker can exploit this vulnerability by sending a specially crafted HTTP request to read sensitive files, leading to potential system compromise or data leakage.

Conceptual Example Code

A conceptual example of exploiting this vulnerability could be an HTTP GET request to the /read endpoint, like this:

GET /read?file=/etc/passwd HTTP/1.1
Host: vulnerable.server.com

Solution

The vulnerability has been patched in SysmonElixir version 1.0.1, which adds a whitelist that limits reading to only files under priv/data. Users are strongly advised to update to the latest version of SysmonElixir. In cases where immediate patching is not possible, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation, configured to block or alert on HTTP requests to the /read endpoint.

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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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