CVE-2023-4096
📋 TL;DR
CVE-2023-4096 is a weak password recovery mechanism vulnerability in Fujitsu Arconte Áurea version 1.5.0.0. Attackers can brute-force the emailed PIN number during password reset to hijack legitimate user accounts. Organizations using this specific version of Fujitsu's Arconte Áurea software are affected.
💻 Affected Systems
- Fujitsu Arconte Áurea
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover of administrative or privileged users leading to full system compromise, data theft, and unauthorized access to sensitive information.
Likely Case
Account takeover of regular users resulting in unauthorized access to user data, potential lateral movement, and business disruption.
If Mitigated
Limited impact with proper monitoring and rate limiting, though the vulnerability still exists in the codebase.
🎯 Exploit Status
Exploitation requires access to the password reset functionality but no authentication. Brute-force attacks on PIN codes are well-understood and easily automated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available references
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-fujitsu-arconte-aurea
Restart Required: Yes
Instructions:
1. Contact Fujitsu support for the latest patched version. 2. Backup current configuration and data. 3. Apply the vendor-provided patch or upgrade to a fixed version. 4. Restart the Arconte Áurea service. 5. Verify functionality post-update.
🔧 Temporary Workarounds
Implement Rate Limiting
allConfigure web application firewall or network controls to limit password reset attempts per IP/user.
Disable Password Reset Functionality
allTemporarily disable the password recovery feature until patching is complete.
🧯 If You Can't Patch
- Implement network segmentation to isolate Arconte Áurea systems from critical infrastructure.
- Enable detailed logging and monitoring of all password reset attempts and account changes.
🔍 How to Verify
Check if Vulnerable:
Check the Arconte Áurea version in the application interface or configuration files. If version is 1.5.0.0, the system is vulnerable.Check Version:
Check application GUI or configuration files for version information (specific command depends on installation method).Verify Fix Applied:
Verify the application version has been updated to a version later than 1.5.0.0. Test password reset functionality with monitoring to ensure PIN brute-forcing is no longer possible.📡 Detection & Monitoring
Log Indicators:
- Multiple failed password reset attempts from single IP/user
- Successful password reset followed by unusual account activity
- High volume of requests to password recovery endpoints
Network Indicators:
- Unusual traffic patterns to password reset API endpoints
- Multiple POST requests to /recover-password or similar endpoints
SIEM Query:
source="arconte_aurea" AND (event_type="password_reset_attempt" AND count > 10 within 5min) OR (event_type="password_change" AND source_ip NOT IN trusted_networks)