CVE-2025-48952
📋 TL;DR
This CVE describes an authentication bypass vulnerability in NetAlertX where attackers can log in without valid credentials using specially crafted 'magic hash' passwords. The vulnerability exists due to PHP's loose comparison (==) operator treating certain SHA-256 hash strings beginning with '0e' followed by digits as equal to zero. All users running vulnerable versions of NetAlertX are affected and could face unauthorized access to the system.
💻 Affected Systems
- NetAlertX
📦 What is this software?
Netalertx by Netalertx
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where attackers gain administrative access to NetAlertX, potentially leading to network reconnaissance, data exfiltration, or using the system as a foothold for lateral movement.
Likely Case
Unauthorized users gain access to NetAlertX dashboard and network monitoring capabilities, allowing them to view sensitive network information and potentially modify alert configurations.
If Mitigated
Limited impact with proper network segmentation and monitoring, though authentication bypass still represents a significant security violation.
🎯 Exploit Status
Exploitation requires knowledge of magic hash values and access to login interface. The advisory includes technical details that could be used to craft exploits.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 25.6.7
Vendor Advisory: https://github.com/jokob-sk/NetAlertX/security/advisories/GHSA-4p4p-vq2v-9489
Restart Required: Yes
Instructions:
1. Backup current NetAlertX installation and configuration. 2. Update to version 25.6.7 via git pull or download from GitHub. 3. Restart the NetAlertX service. 4. Verify the fix by checking the version and testing authentication.
🔧 Temporary Workarounds
Manual code patch
linuxReplace loose comparison (==) with strict comparison (===) in front/index.php line 40
sed -i '40s/==/===/' /path/to/NetAlertX/front/index.php
🧯 If You Can't Patch
- Implement network-level access controls to restrict NetAlertX access to trusted IP addresses only
- Enable multi-factor authentication or implement a reverse proxy with additional authentication layer
🔍 How to Verify
Check if Vulnerable:
Check if front/index.php line 40 contains loose comparison (==) for password verification instead of strict comparison (===)Check Version:
grep -i 'version' /path/to/NetAlertX/README.md or check git tagVerify Fix Applied:
Verify that line 40 in front/index.php uses === instead of ==, and test authentication with known magic hash passwords📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login with unusual username patterns
- Login attempts using usernames that might be testing magic hash values
Network Indicators:
- Unusual authentication traffic patterns to NetAlertX login endpoint
- Access from unexpected IP addresses or geolocations
SIEM Query:
source="netalertx.log" (event="login" AND result="success") | stats count by src_ip, user | where count > threshold