InfrastructureMC Works deserialization bugs demand OT segmentation
CISA reports multiple MC Works64/32 broker and server flaws that could enable remote code execution, denial of service, or data tampering when attackers send crafted packets.
Fact-checked and reviewed — Kodi C.
At a glance
CISA advisory ICSA-20-170-02 published on disclosed multiple vulnerabilities in Mitsubishi Electric MC Works64 and MC Works32, HMI/SCADA platforms sharing underlying technology with ICONICS GENESIS. The vulnerabilities enable remote code execution, denial of service, information disclosure, or data tampering through network-based attacks targeting broker and server components.
MC Works Platform Context
MC Works is Mitsubishi Electric's HMI/SCADA platform built on ICONICS technology:
- Technology relationship: MC Works64/32 shares underlying architecture with ICONICS GENESIS64/32, meaning many vulnerabilities affect both product lines.
- Deployment sectors: Used in manufacturing, infrastructure, and building automation applications.
- Component architecture: Includes Broker64/Broker32 for data brokering, Platform Services for system management, and FrameWorX Server for database and configuration.
- Integration scope: Connects to MELSEC PLCs and other Mitsubishi Electric automation products.
Vulnerability breakdown
The advisory documents multiple critical vulnerabilities:
- CVE-2020-12015 (Deserialization): Improper deserialization enables arbitrary code execution through crafted network packets to broker components.
- CVE-2020-12011 (Memory Corruption): Memory corruption in packet handling enables code execution or denial of service.
- CVE-2020-12007 (Out-of-bounds Write): Crafted requests trigger memory corruption leading to code execution.
- CVE-2020-12009 (Input Validation): Insufficient validation enables exploitation through malformed project files.
- SQL Injection: FrameWorX Server components vulnerable to SQL injection enabling database manipulation.
Multiple vulnerabilities carry critical CVSS ratings above 9.0.
Attack Surface Analysis
MC Works exposes multiple attack vectors:
- Network services: Broker and Platform Services listen on network ports accessible from engineering and operator networks.
- Unauthenticated access: Several deserialization vulnerabilities exploitable without authentication.
- Database access: SQL injection in FrameWorX enables database manipulation.
- Project files: Malicious project archives provide file-based attack vectors.
Exploitation Impact
Successful exploitation enables significant compromise:
- Code execution: Remote code execution on HMI servers provides platform control.
- Data tampering: Database manipulation could alter configuration, alarms, or historical data.
- Information disclosure: Access to process data, credentials, or configuration information.
- Denial of service: HMI outages blind operators to process conditions.
- Lateral movement: Compromised servers enable access to connected industrial networks.
Remediation Steps
If you are affected, implement full remediation:
- Apply patches: Install Mitsubishi Electric security updates from the MC Works vulnerability portal.
- Update all instances: Ensure all redundant servers and engineering workstations receive updates.
- Version verification: Confirm updated versions are running after patching.
- Test rollback: Prepare recovery mechanisms before patching production systems.
Network Segmentation
Implement defense-in-depth controls:
- Restrict broker access to authorized engineering workstations only.
- Block external network paths to MC Works services.
- Implement network monitoring for anomalous traffic to broker ports.
- Segment FrameWorX database servers from general network access.
Detection and Monitoring
Deploy detection capabilities:
- Monitor for malformed packets targeting MC Works services.
- Alert on unexpected SQL operations against FrameWorX databases.
- Track service restarts indicating denial of service attempts.
- Log administrative actions for forensic investigation.
Vendor Coordination
If you are affected, coordinate with Mitsubishi Electric for patch availability timelines for specific MC Works versions, migration planning for unsupported versions, and technical guidance on implementing compensating controls.
Wrapping up
ICSA-20-170-02 represents critical risk requiring immediate attention. The combination of remote code execution, unauthenticated exploitation, and deployment in critical infrastructure demands urgent patching and network segmentation setup.
Continue in the Infrastructure pillar
Return to the hub for curated research and deep-dive guides.
Latest guides
-
Telecom Modernization Infrastructure Guide
Modernise telecom infrastructure using 3GPP Release 18 roadmaps, O-RAN Alliance specifications, and ITU broadband benchmarks curated here.
-
Infrastructure Resilience Guide
Coordinate capacity planning, supply chain, and reliability operations using DOE grid programmes, Uptime Institute benchmarks, and NERC reliability mandates covered here.
-
Edge Resilience Infrastructure Guide
Engineer resilient edge estates using ETSI MEC standards, DOE grid assessments, and GSMA availability benchmarks documented here.
Coverage intelligence
- Published
- Coverage pillar
- Infrastructure
- Source credibility
- 73/100 — medium confidence
- Topics
- Mitsubishi Electric · MC Works · deserialization
- Sources cited
- 3 sources (cisa.gov, cvedetails.com, iso.org)
- Reading time
- 5 min
Source material
- ICSA-20-170-02 Mitsubishi Electric MC Works64, MC Works32
- CVE Details - Vulnerability Database — CVE Details
- ISO/IEC 27017:2015 — Cloud Service Security Controls — International Organization for Standardization
Comments
Community
We publish only high-quality, respectful contributions. Every submission is reviewed for clarity, sourcing, and safety before it appears here.
No approved comments yet. Add the first perspective.