CVE-2024-48766: NetAlertX Path Traversal Vulnerability

CVE-2024-48766 Overview

CVE-2024-48766 is an unauthenticated file read vulnerability in NetAlertX, an open-source network monitoring and intruder detection tool. Versions 24.7.18 through 24.10.11 allow remote attackers to read arbitrary files on the server without authentication. The flaw resides in components/logs.php and stems from improper handling of HTTP redirects combined with strpos-based path validation that fails to block directory traversal sequences. According to the CVE description, the vulnerability was exploited in the wild in May 2025. A Metasploit auxiliary module (netalertx_file_read.rb) is publicly available, lowering the barrier for opportunistic exploitation.

Critical Impact

Unauthenticated attackers can read arbitrary files from the NetAlertX host, exposing configuration data, credentials, and system files reachable by the web server process.

Affected Products

• NetAlertX 24.7.18 through 24.10.11
• components/logs.php log retrieval endpoint
• Deployments exposing the NetAlertX web interface to untrusted networks

Discovery Timeline

• 2025-05-13 - CVE-2024-48766 published to the National Vulnerability Database
• May 2025 - Exploitation observed in the wild, per the CVE description
• 2025-06-24 - Last updated in NVD database

Technical Details for CVE-2024-48766

Vulnerability Analysis

NetAlertX exposes a log viewer in components/logs.php that accepts a user-supplied file parameter. The component attempts to restrict access to files inside the expected log directory using strpos checks against the requested path. This validation pattern is insufficient because strpos only verifies that a substring exists at any position in the string, not that the resolved path remains within the intended directory. The flaw is classified as [CWE-22] Path Traversal and [CWE-698] Execution After Redirect.

The second condition that makes exploitation reliable is the application's reliance on HTTP redirects for access control. The vulnerable endpoint issues a redirect when validation fails, but continues to render or return file content in the same response body. An HTTP client that ignores the redirect, such as curl with redirects disabled or the Metasploit module, receives the underlying file data.

Root Cause

The root cause is a combination of two design errors. First, path validation uses substring matching rather than canonical path resolution, so traversal sequences like ../ bypass the check. Second, the server emits sensitive content alongside a redirect response instead of terminating execution after the redirect header. Clients that disregard the Location header read the file content directly from the response body.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker sends an HTTP request to components/logs.php with a crafted file parameter containing directory traversal sequences. The client must be configured to ignore HTTP redirects so the response body, which contains the requested file contents, is read instead of followed. The public Metasploit module auxiliary/scanner/http/netalertx_file_read automates this workflow against exposed instances.

No synthetic exploit code is reproduced here. See the Metasploit module source and the Rhino Security Labs research for verified technical details.

Detection Methods for CVE-2024-48766

Indicators of Compromise

• HTTP requests to components/logs.php containing ../ sequences or absolute paths such as /etc/passwd, /etc/shadow, or NetAlertX configuration files
• Requests to the NetAlertX web interface from user agents associated with Metasploit (Ruby, Mozilla/5.0 (Metasploit)) or scripted clients with redirect-following disabled
• 302 responses from logs.php that carry a non-empty response body containing file content

Detection Strategies

• Inspect web server access logs for requests to /components/logs.php with suspicious file or path parameters and traversal patterns
• Alert on HTTP 302 responses from NetAlertX endpoints where the body length exceeds typical redirect payloads
• Deploy network IDS signatures targeting the Metasploit module's request fingerprint and traversal payloads against NetAlertX URIs

Monitoring Recommendations

• Forward NetAlertX web server logs to a centralized analytics platform and retain them long enough to investigate exploitation that may predate disclosure
• Monitor outbound connections from the NetAlertX host for signs of follow-on activity after credentials or tokens may have been read
• Track file access patterns on the underlying host for reads of sensitive files by the web server user

How to Mitigate CVE-2024-48766

Immediate Actions Required

• Upgrade NetAlertX to version 24.10.12 or later, which contains the fix for components/logs.php
• Restrict access to the NetAlertX web interface to trusted management networks using firewall or reverse proxy rules
• Audit the NetAlertX host for evidence of prior file reads, focusing on configuration files and any stored secrets
• Rotate any credentials, API tokens, or session secrets stored on or reachable by the NetAlertX server

Patch Information

The vulnerability is fixed in NetAlertX 24.10.12. Refer to the Rhino Security Labs research for related advisory context and to the project's release notes for upgrade instructions.

Workarounds

• Place NetAlertX behind an authenticating reverse proxy that blocks unauthenticated requests to components/logs.php
• Add a web application firewall rule that rejects requests to logs.php containing ../, encoded traversal sequences, or absolute file paths
• Remove or restrict file permissions on the NetAlertX host so the web server account cannot read sensitive files outside its required scope

# Example nginx rule blocking traversal attempts against the vulnerable endpoint
location /components/logs.php {
    if ($args ~* "(\.\./|%2e%2e/|/etc/|/root/)") {
        return 403;
    }
    proxy_pass http://netalertx_backend;
}