T09 · Insecure Skill Coding Practices
- Location
SKILL.md:18- Finding
Hardcoded Printer Authentication and Connection Data
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 18–25
Vulnerability Type: Hardcoded sensitive configuration and authentication material
Risk Level: MediumVulnerable Code Snippet:
markdown ## Printer Configuration - **Name:** Ralph Wiggum - **IP:** 10.0.0.41 - **Serial:** SNMSRE9704441 - **Check Code:** a31d9729 - **Camera:** Port 8080 (web interface) - **Control:** Port 8899 (G-code)Technical Analysis
The Skill embeds a specific printer's private IP address, serial number, check code, camera port, and G-code control port directly in distributable documentation. The check code appears to be authentication or pairing material associated with the printer. Even if the private IP address is not directly reachable from the public Internet, these values reduce the information and authentication barriers for an attacker who has access to the same network.
The documented control interface supports commands that start, pause, stop, or otherwise manipulate physical printer operations. The camera endpoint may also expose images from the printer's environment. Secrets and device-specific identifiers should not be committed to a Skill package because users, logs, source repositories, archives, and package distribution systems may retain them.
Attack Path
- An attacker obtains the Skill package or reads its repository contents.
- The attacker extracts the printer IP address, control port, camera port, serial number, and check code from
SKILL.md. - The attacker obtains network access to
10.0.0.41, such as through the same LAN, a compromised local host, an exposed VPN, or an incorrectly routed private network. - The attacker connects to port
8899or uses a compatible Flashforge client with the disclosed device information. - If the check code is accepted as authentication, the attacker issues printer-control operations, including selecting, starting, pausing, stopping, or ot ...[truncated 939 chars]
- Remediation
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Remediation Suggestions
- Remove all real device identifiers and authentication values from the Skill documentation.
- Immediately rotate or regenerate the disclosed printer check code.
- Replace concrete values with placeholders, for example:
markdown - **IP:** `${PRINTER_HOST}` - **Serial:** `${PRINTER_SERIAL}` - **Check Code:** loaded from a protected secret store - Load the check code at runtime from an environment variable, operating-system credential manager, or dedicated secrets manager.
- Ensure secrets are excluded from source control, logs, command histories, generated documentation, and diagnostic output.
- Restrict ports
8080and8899using network segmentation and firewall rules so only explicitly authorized management hosts can connect. - Require device-side authentication for both camera and control interfaces where supported.
- Add automated secret scanning to the repository and distribution pipeline.