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How the Vulnerability Works
CVE-2025-40581 exploits improper authentication mechanisms in SINEMA Remote Connect Edge Client on SCALANCE LPE9403 devices. The vulnerability occurs due to insufficient validation of session tokens during configuration access. When a local attacker sends specially crafted requests to the client interface, the system fails to verify proper credentials, allowing unauthorized access. The flaw resides in the client’s authentication module where temporary session tokens remain valid after logout. Attackers can reuse these tokens or craft null session requests to bypass authentication entirely. This grants full read/write access to device configurations including network parameters, security settings, and connection profiles. The vulnerability is particularly dangerous as it requires no privileges and can be exploited locally with basic network access to the device.
DailyCVE Form
Platform: SCALANCE LPE9403
Version: All versions
Vulnerability: Auth bypass
Severity: Critical
Date: 06/04/2025
Prediction: Patch by Q3 2025
What Undercode Say:
Proof-of-Concept Exploit Code import requests target = "http://192.168.1.100:8080/config" headers = {"Session-Token": "null"} response = requests.get(target, headers=headers) print(response.json())
Detection Command nmap -p 8080 --script http-vuln-cve2025-40581 <target_ip>
Protection Script from flask import abort def verify_session(token): if token == "null" or not token: abort(401) Add proper token validation logic
SIEM Detection Rule alert http any any -> $HOME_NET 8080 (msg:"CVE-2025-40581 Exploit Attempt"; content:"Session-Token: null"; sid:1000001;)
Mitigation Steps 1. Disable SINEMA Remote Connect Edge Client 2. Implement network segmentation 3. Apply firmware update when available 4. Enable strict session validation 5. Monitor for null token requests
// Vulnerable Code Snippet int validate_session(char token) { if(token == NULL) return 1; // Flaw: Allows null tokens // ... rest of validation }
Patch Verification Test import unittest class TestAuthFix(unittest.TestCase): def test_null_token(self): response = requests.get(config_url, headers={"Session-Token":None}) self.assertEqual(response.status_code, 401)
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode