T05 · Unauthorized Access and Privilege Escalation
- Location
SKILL.md:27- Finding
Excessive Command-Execution and File-Write Permissions
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 27–30
Vulnerability Type: Excessive tool permissions and violation of least privilege
Risk Level: Mediumyaml tools: - read - exec - writeTechnical Analysis
The Skill requests unrestricted command-execution and file-write capabilities even though the package contains only a Markdown instruction file and no implementation demonstrating a legitimate need for these permissions. Its documented functions primarily consist of configuration examples and operational guidance that can be delivered using read-only access.
Granting both
execandwriteexpands the Skill's authority beyond its stated purpose. If attacker-controlled instructions, command parameters, file paths, or API-generation content are processed during a Skill invocation, the Agent could use these tools to execute arbitrary local commands or modify files outside the intended project scope.The risk is compounded by troubleshooting guidance at
SKILL.mdlines 420 and 443 that recommends running as an administrator when permissions are insufficient. Although this guidance does not itself elevate privileges automatically, following it could substantially increase the consequences of an unsafe command or write operation.Attack Path
- A user or external data source supplies attacker-controlled content to a workflow using this Skill.
- The content is interpreted as requiring file generation, command execution, dependency setup, or troubleshooting.
- The Skill uses its declared
writecapability to create or alter a local file, or itsexeccapability to run a command influenced by the supplied content. - If the operation fails because of insufficient permissions, the documented troubleshooting guidance may encourage rerunning the Agent or operation with administrator privileges.
- The attacker-influenced operation then executes with broader access, potentially modifyin ...[truncated 765 chars]
- Remediation
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Remediation Suggestions
- Remove
execandwritefrom the declared tools unless a documented workflow strictly requires them. - Prefer read-only operation for configuration analysis, documentation generation, and advisory responses.
- If file output is required, restrict writes to a dedicated project-relative output directory and reject absolute paths, traversal sequences, symbolic-link escapes, and writes to existing sensitive files.
- If command execution is required, use an explicit allowlist of fixed executables and arguments rather than passing generated or user-controlled strings to a shell.
- Require explicit user confirmation before every command execution or filesystem modification, showing the exact command, arguments, and destination path.
- Run the Skill in a sandbox with minimal filesystem access, no administrative privileges, limited environment variables, and network access disabled unless specifically needed.
- Replace the administrator-execution recommendations at lines 420 and 443 with least-privilege diagnostics. Elevated execution should not be presented as a routine solution to permission errors.
- Document concrete permission requirements and validate all user-controlled content before it can influence tool names, command arguments, file paths, or generated scripts.
- Remove