CVE-2025-41064
📋 TL;DR
An incorrect authentication vulnerability in OpenSIAC could allow attackers to impersonate legitimate users who authenticate via Spain's Cl@ve system. This affects organizations using OpenSIAC with Cl@ve authentication enabled. The vulnerability stems from improper validation of authentication tokens.
💻 Affected Systems
- OpenSIAC
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could gain unauthorized access to sensitive government or organizational systems, potentially accessing confidential citizen data, performing unauthorized transactions, or compromising administrative functions.
Likely Case
Targeted attacks against specific organizations using OpenSIAC with Cl@ve, leading to unauthorized access to user accounts and potential data exposure.
If Mitigated
With proper network segmentation and monitoring, impact would be limited to isolated systems with rapid detection of unauthorized access attempts.
🎯 Exploit Status
Exploitation requires understanding of Cl@ve authentication flow and ability to intercept or manipulate authentication tokens.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in advisory
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/incorrect-authentication-gtts-group-opensiac
Restart Required: Yes
Instructions:
1. Check the INCIBE advisory for patch details. 2. Apply the latest OpenSIAC update from official sources. 3. Restart OpenSIAC services. 4. Verify authentication functionality post-update.
🔧 Temporary Workarounds
Disable Cl@ve Authentication
allTemporarily disable Cl@ve authentication method until patch can be applied
# Configuration change in OpenSIAC authentication settings
# Set authentication.method = alternative_method
Network Segmentation
linuxRestrict access to OpenSIAC systems to trusted networks only
# Firewall rule example: iptables -A INPUT -p tcp --dport [opensiac_port] -s [trusted_network] -j ACCEPT
# iptables -A INPUT -p tcp --dport [opensiac_port] -j DROP
🧯 If You Can't Patch
- Implement multi-factor authentication for all user accounts
- Enable detailed authentication logging and monitor for suspicious login patterns
🔍 How to Verify
Check if Vulnerable:
Check if OpenSIAC is configured with Cl@ve authentication method enabled in authentication settingsCheck Version:
# Check OpenSIAC version from application interface or configuration filesVerify Fix Applied:
Verify authentication token validation is properly implemented and test Cl@ve authentication with invalid tokens📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts from same source
- Successful authentication with unusual timing patterns
- Authentication attempts with malformed tokens
Network Indicators:
- Unusual authentication traffic patterns
- Traffic to/from OpenSIAC on non-standard ports
- Authentication requests from unexpected geographic locations
SIEM Query:
source="opensiac" AND (event_type="authentication" AND (result="success" FROM suspicious_ip OR token_validation="failed"))