CVE-2025-52631
📋 TL;DR
HCL AION 2.0 lacks proper HTTP Strict-Transport-Security headers, allowing attackers to force insecure HTTP connections or downgrade HTTPS to HTTP. This exposes the application to man-in-the-middle attacks where attackers can intercept, modify, or steal sensitive data. Only HCL AION 2.0 installations are affected.
💻 Affected Systems
- HCL AION
📦 What is this software?
Aion by Hcltech
⚠️ Risk & Real-World Impact
Worst Case
Attackers intercept all traffic between users and AION, stealing credentials, session tokens, and sensitive business data, potentially leading to full system compromise.
Likely Case
Attackers on the same network intercept specific sessions or data transmissions, potentially gaining unauthorized access to sensitive information.
If Mitigated
With proper network segmentation and monitoring, impact is limited to potential data leakage from intercepted communications.
🎯 Exploit Status
Exploitation requires network access to intercept traffic. No authentication needed to perform protocol downgrade attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patch version
Vendor Advisory: https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0127972
Restart Required: Yes
Instructions:
1. Review HCL advisory KB0127972. 2. Download and apply the official patch from HCL. 3. Restart AION services. 4. Verify HSTS headers are present in responses.
🔧 Temporary Workarounds
Configure Reverse Proxy with HSTS
allPlace AION behind a reverse proxy (nginx, Apache, etc.) that adds HSTS headers
# Example nginx config:
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
Web Server HSTS Configuration
allConfigure the web server hosting AION to add HSTS headers
# Apache example:
Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"
🧯 If You Can't Patch
- Implement network segmentation to isolate AION from untrusted networks
- Deploy SSL/TLS inspection and monitoring to detect downgrade attempts
🔍 How to Verify
Check if Vulnerable:
Use curl or browser developer tools to check HTTP responses: curl -I https://aion-server/ | grep -i strict-transport-securityCheck Version:
Check AION version through admin interface or consult deployment documentationVerify Fix Applied:
Verify HSTS header appears in HTTPS responses with proper max-age value📡 Detection & Monitoring
Log Indicators:
- HTTP protocol downgrade attempts in web server logs
- Multiple failed HTTPS connections followed by HTTP connections
Network Indicators:
- SSL/TLS stripping attempts
- HTTP traffic to normally HTTPS-only endpoints
SIEM Query:
source="web_server" (http_request AND NOT ssl) dest_port=80 dest_ip="aion_server_ip"