CVE-2021-45031
📋 TL;DR
This vulnerability in MEPSAN's USC+ software allows attackers to generate passwords for high-privileged accounts due to a weakness in the login function. It affects USC+ versions before 3.0, potentially enabling unauthorized administrative access to critical systems.
💻 Affected Systems
- MEPSAN USC+
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full administrative control, allowing them to manipulate critical systems, exfiltrate sensitive data, or disrupt operations.
Likely Case
Unauthorized users create administrative accounts to access sensitive functions and data within the USC+ system.
If Mitigated
With proper network segmentation and monitoring, impact is limited to isolated systems with quick detection of unauthorized access attempts.
🎯 Exploit Status
The vulnerability description suggests direct exploitation of login function weakness without requiring authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0
Vendor Advisory: https://www.usom.gov.tr/bildirim/tr-22-0269
Restart Required: Yes
Instructions:
1. Contact MEPSAN for USC+ version 3.0 update. 2. Backup current configuration. 3. Apply the update following vendor instructions. 4. Restart the USC+ system. 5. Verify functionality post-update.
🔧 Temporary Workarounds
Network Isolation
allRestrict network access to USC+ systems to only authorized management networks
Access Control Hardening
allImplement strict firewall rules and monitor for unauthorized access attempts
🧯 If You Can't Patch
- Implement network segmentation to isolate USC+ systems from untrusted networks
- Enable detailed logging and monitoring for suspicious account creation or login attempts
🔍 How to Verify
Check if Vulnerable:
Check USC+ software version in system settings or about dialog - if version is below 3.0, system is vulnerable.Check Version:
Check within USC+ application interface or consult system documentation for version verification method.Verify Fix Applied:
Verify USC+ version shows 3.0 or higher after update and test that unauthorized account creation is no longer possible.📡 Detection & Monitoring
Log Indicators:
- Unexpected account creation events
- Multiple failed login attempts followed by successful administrative login
- Login attempts from unusual IP addresses
Network Indicators:
- Unusual network traffic to USC+ login endpoints
- Traffic patterns suggesting brute force or enumeration attempts
SIEM Query:
source="USC+ logs" AND (event_type="account_creation" OR (login_attempts > 5 AND success=true))