T05 · Unauthorized Access and Privilege Escalation
- Location
SKILL.md:25- Finding
Unnecessary General-Purpose Command Execution Permission
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 25–28
Vulnerability Type: Excessive tool permissions violating least privilege
Risk Level: Mediumyaml tools: - read - exec - writeRelated execution-oriented configuration at lines 174–180:
markdown ### Availability Classification - **Classification**: MD+EXEC（） **API Key Configuration**: ```bash export API_KEY=${API_KEY:?Please set the environment variable}After configuration, restart the session or open a new terminal for it to take effect. API keys should be properly protected and must not be committed to version control.
text ### Technical Analysis The skill declares access to the general-purpose `exec` tool even though its documented functionality consists of structured Discord operations such as sending, reading, editing, deleting, reacting to, and pinning messages. These operations do not inherently require arbitrary local command execution. The only documented shell operation checks whether a generic environment variable exists. This does not justify granting unrestricted command execution to the skill. A platform-managed secret configuration mechanism or a narrowly scoped validation tool would provide the required functionality without exposing a shell. Granting `exec` expands the skill's authority beyond its stated purpose and violates the principle of least privilege. If attacker-controlled Discord content, user input, or another untrusted instruction influences the agent, the unnecessarily available execution tool could be invoked for operations unrelated to Discord management. No directly malicious command, automatic execution flow, or embedded executable payload was identified. Exploitation therefore depends on the host agent granting the declared tool and allowing untrusted content to influence tool invocation. ### Attack Path 1. The host loads the skill and grants the tools declared in its metad ...[truncated 1086 chars]- Remediation
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Remediation Suggestions
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Remove
execfrom the declared tool list because the documented Discord operations do not require arbitrary shell access:yaml tools: - read - write -
Prefer narrowly scoped Discord APIs and purpose-specific tools for message, reaction, pin, and permission operations.
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Replace the shell-based
API_KEYcheck with the agent platform's managed secret configuration and validation mechanism. Use a Discord-specific variable name where configuration documentation is necessary. -
If command execution is genuinely required in a future version, expose only an allowlisted wrapper that accepts fixed operations and validated arguments rather than a general-purpose shell.
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Require explicit user approval for any local process execution and run the skill in a sandbox with minimal filesystem, environment-variable, and network access.
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Treat Discord messages and other externally sourced text as untrusted data. Do not interpret their contents as agent instructions or executable commands.
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