CVE-2022-33323
📋 TL;DR
This vulnerability allows remote unauthenticated attackers to bypass authentication on Mitsubishi Electric industrial robot controllers via unauthorized telnet login due to active debug code. It affects MELFA SD/SQ Series and MELFA F-Series robot controllers. Industrial facilities using these vulnerable robot controllers are at risk.
💻 Affected Systems
- Mitsubishi Electric MELFA SD Series
- Mitsubishi Electric MELFA SQ Series
- Mitsubishi Electric MELFA F-Series
📦 What is this software?
Rh 12fh55 Firmware by Mitsubishielectric
Rh 12fh70 Firmware by Mitsubishielectric
Rh 12fh85 Firmware by Mitsubishielectric
Rh 12sdh55 Firmware by Mitsubishielectric
Rh 12sdh70 Firmware by Mitsubishielectric
Rh 12sdh85 Firmware by Mitsubishielectric
Rh 12sqh55 Firmware by Mitsubishielectric
Rh 12sqh70 Firmware by Mitsubishielectric
Rh 12sqh85 Firmware by Mitsubishielectric
Rh 20fh100 Firmware by Mitsubishielectric
Rh 20fh85 Firmware by Mitsubishielectric
Rh 20sdh100 Firmware by Mitsubishielectric
Rh 20sdh85 Firmware by Mitsubishielectric
Rh 20sqh85 Firmware by Mitsubishielectric
Rh 3fh35 Firmware by Mitsubishielectric
Rh 3fh45 Firmware by Mitsubishielectric
Rh 3fh55 Firmware by Mitsubishielectric
Rh 3sdhr Firmware by Mitsubishielectric
Rh 3sqhr Firmware by Mitsubishielectric
Rh 6fh35 Firmware by Mitsubishielectric
Rh 6fh45 Firmware by Mitsubishielectric
Rh 6fh55 Firmware by Mitsubishielectric
Rh 6sdh35 Firmware by Mitsubishielectric
Rh 6sdh45 Firmware by Mitsubishielectric
Rh 6sdh55 Firmware by Mitsubishielectric
Rh 6sqh35 Firmware by Mitsubishielectric
Rh 6sqh45 Firmware by Mitsubishielectric
Rh 6sqh55 Firmware by Mitsubishielectric
Rv 12sd Firmware by Mitsubishielectric
Rv 12sdl Firmware by Mitsubishielectric
Rv 12sq Firmware by Mitsubishielectric
Rv 12sql Firmware by Mitsubishielectric
Rv 13f Firmware by Mitsubishielectric
Rv 13fl Firmware by Mitsubishielectric
Rv 20f Firmware by Mitsubishielectric
Rv 2f Firmware by Mitsubishielectric
Rv 2sdb Firmware by Mitsubishielectric
Rv 2sqb Firmware by Mitsubishielectric
Rv 3sd Firmware by Mitsubishielectric
Rv 3sdj Firmware by Mitsubishielectric
Rv 3sq Firmware by Mitsubishielectric
Rv 3sqj Firmware by Mitsubishielectric
Rv 4f Firmware by Mitsubishielectric
Rv 4fl Firmware by Mitsubishielectric
Rv 6sd Firmware by Mitsubishielectric
Rv 6sdl Firmware by Mitsubishielectric
Rv 6sq Firmware by Mitsubishielectric
Rv 6sql Firmware by Mitsubishielectric
Rv 7f Firmware by Mitsubishielectric
Rv 7fl Firmware by Mitsubishielectric
Rv 7fll Firmware by Mitsubishielectric
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial robot controllers allowing attackers to manipulate robot operations, cause physical damage, disrupt manufacturing processes, or use as foothold for lateral movement in industrial networks.
Likely Case
Unauthorized access to robot controllers enabling configuration changes, operational disruption, data theft, or installation of malware in industrial environments.
If Mitigated
Limited impact if controllers are isolated in air-gapped networks with strict access controls and network segmentation.
🎯 Exploit Status
Authentication bypass via telnet suggests straightforward exploitation once network access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: See vendor advisory for specific patched firmware versions
Vendor Advisory: https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2022-020_en.pdf
Restart Required: Yes
Instructions:
1. Review Mitsubishi Electric advisory for affected models and firmware versions. 2. Download and apply vendor-provided firmware updates. 3. Restart affected robot controllers. 4. Verify patch application.
🔧 Temporary Workarounds
Disable Telnet Service
allDisable telnet service on affected robot controllers if not required for operations.
Consult Mitsubishi Electric documentation for telnet disable procedures
Network Segmentation
allIsolate robot controllers in separate network segments with strict firewall rules.
Configure firewall to block telnet (port 23) from untrusted networks
🧯 If You Can't Patch
- Implement strict network access controls to limit telnet access to authorized IP addresses only
- Monitor telnet authentication logs for unauthorized access attempts and implement alerting
🔍 How to Verify
Check if Vulnerable:
Check controller firmware version against affected versions in vendor advisory. Test telnet access from unauthorized sources.Check Version:
Consult Mitsubishi Electric documentation for version check procedures specific to each controller modelVerify Fix Applied:
Verify firmware version is updated to patched version. Test that unauthorized telnet access is no longer possible.📡 Detection & Monitoring
Log Indicators:
- Failed telnet authentication attempts
- Successful telnet logins from unexpected sources
- Telnet service restart events
Network Indicators:
- Telnet connections to robot controllers from unauthorized IP addresses
- Unexpected telnet traffic patterns
SIEM Query:
source_port:23 AND (destination_ip:robot_controller_ip) AND NOT (source_ip:authorized_ip_range)🔗 References
- https://jvn.jp/vu/JVNVU94588481/index.html
- https://www.cisa.gov/uscert/ics/advisories/icsa-23-026-05
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2022-020_en.pdf
- https://jvn.jp/vu/JVNVU94588481/index.html
- https://www.cisa.gov/uscert/ics/advisories/icsa-23-026-05
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2022-020_en.pdf
