T05 · Unauthorized Access and Privilege Escalation
- Location
SKILL.md:25- Finding
Excessive Local Tool Permissions Beyond Discord Messaging Requirements
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 25–28 and 256–258
Vulnerability Type: Excessive tool permissions violating least privilege
Risk Level: MediumComplete Code Snippets
yaml tools: - read - exec - writeThe skill later advertises how these broad permissions may be used:
markdown - **File processing**: Supports reading, parsing, and writing multiple file formats - **API integration**: Calls external services through standardized interfaces and processes responses - **Command execution**: Executes system commands in a secure sandbox and collects resultsTechnical Analysis
The skill's stated purpose is to interact with Discord through a dedicated
messagetool, including sending, reading, searching, editing, reacting to, and deleting messages. Nevertheless, its metadata requests the generic localread,write, andexectools rather than declaring the dedicated messaging capability.These permissions substantially exceed the least privilege required for the primary Discord workflow:
readmay expose local files and sensitive configuration.writemay create or alter local files.execmay run arbitrary operating-system commands with the privileges of the hosting agent.- The generic API-integration claim may also enable outbound transmission if the execution environment provides network access.
The local archive example at line 154 may justify narrowly scoped output-file access, but it does not justify unrestricted file access or command execution. Although the document claims execution occurs in a sandbox, it defines no enforceable path, command, process, environment-variable, or network restrictions.
No explicit malicious command, credential-theft instruction, persistence mechanism, remote payload, or obfuscated executable content was found. The issue is the unnecessary privilege surface and the potential for those capabilities to be misused.
Attack Path
- An agent loads the ...[truncated 1360 chars]
- Remediation
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Remediation Suggestions
-
Remove generic capabilities that are not essential:
yaml tools: - message -
Remove the generic file-processing, API-integration, and command-execution claims unless those functions are genuine, necessary, and protected by explicit controls.
-
If local archival is required, replace unrestricted file access with a narrowly scoped capability that:
- Writes only to a user-approved directory.
- Rejects absolute paths and path traversal.
- Prevents overwriting existing files unless the user explicitly confirms it.
- Does not permit reads from arbitrary local paths.
- Applies restrictive file permissions.
-
Do not grant shell execution for Discord messaging or archival. If a separate workflow genuinely requires execution, isolate it into another skill with:
- An explicit command allowlist.
- Fixed argument schemas.
- No shell interpolation.
- Minimal environment-variable exposure.
- Disabled network access by default.
- Resource and execution-time limits.
- User confirmation before execution.
-
Validate Discord channel IDs, message IDs, limits, and other parameters using strict schemas. Require confirmation for destructive operations such as deleting messages.
-
Apply least-privilege Discord permissions. Avoid recommending
MANAGE_MESSAGESunless deletion of other users' messages is an explicit and approved requirement. -
Add tests or policy checks that reject undeclared tool use and verify that the skill cannot access local files or execute commands during ordinary Discord operations.
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