CVE-2020-6779
📋 TL;DR
This CVE involves hard-coded credentials in Bosch FSM server databases, allowing unauthenticated remote attackers to gain admin access. This can lead to complete data compromise, database disruption, and remote code execution. Affected systems include Bosch FSM-2500 and FSM-5000 servers up to version 5.2.
💻 Affected Systems
- Bosch FSM-2500 server
- Bosch FSM-5000 server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover: attacker gains admin database access, exfiltrates all sensitive data, executes arbitrary OS commands, and potentially disrupts critical building management operations.
Likely Case
Unauthenticated attacker accesses database with admin privileges, views/modifies/deletes sensitive building management data, and may pivot to other systems.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated database compromise without lateral movement.
🎯 Exploit Status
Exploitation requires only knowledge of hard-coded credentials and network access to database port. No authentication or special tools needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 5.3 or later
Vendor Advisory: https://psirt.bosch.com/security-advisories/BOSCH-SA-332072-BT.html
Restart Required: Yes
Instructions:
1. Download updated firmware version 5.3+ from Bosch support portal. 2. Backup current configuration and data. 3. Apply firmware update following Bosch documentation. 4. Restart server. 5. Verify new credentials are in use.
🔧 Temporary Workarounds
Network Segmentation
allIsolate FSM servers from untrusted networks and limit database port access
firewall rules to restrict access to database port (typically 1433 for MSSQL)
Credential Rotation
allManually change database credentials if supported by application
ALTER LOGIN [admin] WITH PASSWORD = 'new_strong_password';
🧯 If You Can't Patch
- Implement strict network access controls: allow only trusted IPs to connect to database port
- Monitor database authentication logs for unauthorized access attempts using default credentials
🔍 How to Verify
Check if Vulnerable:
Attempt to authenticate to the database using known hard-coded credentials on default portCheck Version:
Check web interface or system information page for firmware versionVerify Fix Applied:
Verify firmware version is 5.3+ and test that hard-coded credentials no longer work📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful login with default credentials
- Database admin login from unexpected IP addresses
Network Indicators:
- Unusual database connections on port 1433 (or configured DB port) from external sources
- Database queries from unauthorized sources
SIEM Query:
source="database_logs" AND (event="authentication_success" AND user="admin") AND NOT src_ip IN [trusted_ips]