CVE-2020-10055
📋 TL;DR
This vulnerability allows remote unauthenticated attackers to execute arbitrary commands with SYSTEM privileges on Desigo CC building automation systems. It affects Desigo CC and Desigo CC Compact versions 3.x and 4.x when the Advanced Reporting Engine is enabled. The vulnerability exists in the BIRT third-party component.
💻 Affected Systems
- Desigo CC
- Desigo CC Compact
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining SYSTEM privileges, enabling data theft, ransomware deployment, or disruption of building automation systems.
Likely Case
Remote code execution leading to data exfiltration, installation of backdoors, or lateral movement within the network.
If Mitigated
Limited impact if systems are isolated, patched, or have the Advanced Reporting Engine disabled.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with low attack complexity. While no public PoC is confirmed, the high score suggests weaponization is likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest version as specified in Siemens advisories
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-786743.pdf
Restart Required: Yes
Instructions:
1. Review Siemens advisory SSA-786743. 2. Apply vendor-provided updates. 3. Restart affected systems. 4. Verify patch installation.
🔧 Temporary Workarounds
Disable Advanced Reporting Engine
windowsDisable the vulnerable BIRT Advanced Reporting Engine component
Configure via Desigo CC management interface to disable Advanced Reporting Engine
Network Segmentation
allIsolate Desigo CC systems from untrusted networks
Configure firewall rules to restrict access to Desigo CC ports
🧯 If You Can't Patch
- Implement strict network segmentation and access controls
- Disable Advanced Reporting Engine if not required
- Monitor for suspicious activity and implement application whitelisting
🔍 How to Verify
Check if Vulnerable:
Check Desigo CC version and verify if Advanced Reporting Engine is enabled in system configurationCheck Version:
Check version through Desigo CC management interface or system propertiesVerify Fix Applied:
Verify system is updated to patched version and Advanced Reporting Engine status📡 Detection & Monitoring
Log Indicators:
- Unusual process execution, unexpected network connections from Desigo CC systems
- Authentication bypass attempts or unusual reporting engine activity
Network Indicators:
- Suspicious inbound traffic to Desigo CC reporting ports
- Outbound connections from Desigo CC to unexpected destinations
SIEM Query:
source="Desigo CC" AND (event_type="process_execution" OR event_type="network_connection") AND severity=high