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Adversaries may block access to serial COM to prevent instructions or configurations from reaching target devices.
Passed 20 of 23 test cases with the skill, and 9 of 23 without it.
and 9 more in the full report
11 fixed9 passed either way3 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
To isolate field serial gateway ports from untrusted enterprise segments, our network engineering team needs the precise MITRE ATT&CK for ICS mitigation reference ID assigned to Network Segmentation for preventing unauthorized serial comm port access.
| Checked | Without skill | With skill |
|---|---|---|
| The mitigation ID is M0930. | Missed | Passed |
The instructions your model reads when the skill loads.
Adversaries may block access to serial COM to prevent instructions or configurations from reaching target devices. Serial Communication ports (COM) allow communication with control system devices. Devices can receive command and configuration messages over such serial COM. Devices also use serial COM to send command and reporting messages. Blocking device serial COM may also block command messages and block reporting messages.
A serial to Ethernet converter is often connected to a serial COM to facilitate communication between serial and Ethernet devices. One approach to blocking a serial COM would be to create and hold open a TCP session with the Ethernet side of the converter. A serial to Ethernet converter may have a few ports open to facilitate multiple communications. For example, if there are three serial COM available -- 1, 2 and 3 --, the converter might be listening on the corresponding ports 20001, 20002, and 20003. If a TCP/IP connection is opened with one of these ports and held open, then the port will be unavailable for use by another party. One way the adversary could achieve this would be to initiate a TCP session with the serial to Ethernet converter at 10.0.0.1 via Telnet on serial port 1 with the following command: telnet 10.0.0.1 20001.
Platforms: ICS
Determine if the target ICS/SCADA environment is susceptible to Block Serial COM by examining operational technology systems and network architecture.
Review whether mitigations for T0805 are in place. If defenses are absent or misconfigured, this technique may be exploitable in the ICS environment.
Restrict unauthorized devices from accessing serial comm ports.
Ensure devices have an alternative method for communicating in the event that a valid COM port is unavailable.
test cases passed, vs 9 / 23 without
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