Mitsubishi Electric GOT and Tension Controller (Update A)
Monitor7.5ICS-CERT ICSA-21-278-01Oct 5, 2021
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
Specially crafted network packets sent to Mitsubishi Electric GOT (Graphic Operation Terminal) operator panels and tension controller devices can cause a denial-of-service condition due to improper input validation (CWE-20) and missing error handling (CWE-755). Affected devices include GT2104-RTBD, GT2107-WTBD, GT2104-PMBD, GS2110-WTBD-N, GS2110-WTBD, LE7-40GU-L, GT2103-PMBD, GS2107-WTBD, GS2107-WTBD-N, and GT2107-WTSD. No vendor patch is available; Mitsubishi Electric has stated in Update A that further research shows these vulnerabilities may not impact the listed devices, and the vendor is removing its vulnerability notice.
What this means
What could happen
An attacker with network access could send specially crafted packets to cause a denial-of-service condition, temporarily halting communication with the affected operator interface or tension controller until the device is restarted.
Who's at risk
This affects operators of Mitsubishi Electric HMI (human-machine interface) operator panels and tension controllers used in energy generation and distribution facilities. Equipment types include GT series graphic terminals and GS series/LE series tension controllers used for process control and monitoring in power plants and electrical substations.
How it could be exploited
An attacker sends specially crafted network packets to the device's listening port. The device processes the malformed packets without proper validation, crashes, and becomes unresponsive to legitimate control commands until manually restarted.
Prerequisites
- Network access to the affected device on its communications port
- No authentication required
remotely exploitableno authentication requiredlow complexityno patch available
Affected products (10)
10 EOL
ProductAffected VersionsFix Status
GT2104-RTBD: All versionsAll versionsNo fix (EOL)
GT2107-WTBD: All versionsAll versionsNo fix (EOL)
GT2104-PMBD: All versionsAll versionsNo fix (EOL)
GS2110-WTBD-N: All versionsAll versionsNo fix (EOL)
GS2110-WTBD: All versionsAll versionsNo fix (EOL)
LE7-40GU-L: All versionsAll versionsNo fix (EOL)
GT2103-PMBD: All versionsAll versionsNo fix (EOL)
GS2107-WTBD: All versionsAll versionsNo fix (EOL)
Remediation & Mitigation
0/3
Do now
0/1WORKAROUNDEstablish a manual restart procedure and operator training to quickly recover devices when they become unresponsive
Mitigations - no patch available
0/2The following products have reached End of Life with no planned fix: GT2104-RTBD: All versions, GT2107-WTBD: All versions, GT2104-PMBD: All versions, GS2110-WTBD-N: All versions, GS2110-WTBD: All versions, LE7-40GU-L: All versions, GT2103-PMBD: All versions, GS2107-WTBD: All versions, GT2107-WTSD: All versions, GS2107-WTBD-N: All versions. Apply the following compensating controls:
HARDENINGImplement network segmentation to restrict access to the affected GOT and tension controller devices from untrusted networks
HARDENINGMonitor network traffic to the affected devices for anomalous or malformed packets that could trigger denial-of-service conditions
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