T05 · Unauthorized Access and Privilege Escalation
- Location
SKILL.md:28- Finding
Excessive Command-Execution and File-Write Permissions
- Content
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Vulnerability Details
File Location:
SKILL.md:28-31
Supporting Locations:SKILL.md:348-349,SKILL.md:391, andSKILL.md:430
Vulnerability Type: Excessive tool permissions and unsafe privilege-elevation guidance
Risk Level: MediumVulnerable Configuration
yaml tools: - read - exec - writeThe supporting documentation at lines 348-349 advertises external API integration and system-command execution. Lines 391 and 430 recommend running with administrator privileges when file permissions are insufficient.
Technical Analysis
The Skill's declared purpose is long-document analysis, summarization, comparison, and rewriting. These activities require access to user-selected input documents and, when requested, narrowly scoped output-file access. General command execution is not intrinsically required for the documented reasoning workflow.
Granting the Skill unrestricted
execandwritecapabilities violates the principle of least privilege. If untrusted document content, ambiguous user input, or incorrectly interpreted Skill instructions influence tool invocation, the Agent could execute commands or modify files outside the legitimate document-processing scope.The generic recommendation to use administrator privileges compounds this risk. Elevation should not be used as a general remedy for file-access errors because it expands the impact of any accidental or attacker-influenced command. Although the Skill claims command execution occurs in a sandbox, it does not define sandbox boundaries, permitted commands, filesystem restrictions, or enforcement controls.
No specific malicious command, remote endpoint, payload retrieval mechanism, or implemented exfiltration routine was found. The issue is therefore an excessive-permission vulnerability rather than evidence of an intentionally malicious payload.
Attack Path
- A user activates the Skill to process a document.
- T ...[truncated 1530 chars]
- Remediation
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Remediation Suggestions
- Remove
execfrom the default tool declaration unless a specific document parser demonstrably requires command execution. - Use read-only access by default and request write access only when the user explicitly asks to create an output file.
- Restrict file operations to user-selected input files and a dedicated output directory using canonical-path validation and filesystem allowlists.
- If command execution is unavoidable, use an explicit command allowlist, fixed argument schemas, short timeouts, resource limits, disabled shell expansion, and a sandbox without network access.
- Remove the generic recommendation to run as administrator. Resolve permission errors through narrowly scoped ownership or access-control changes instead.
- Require explicit user confirmation before executing commands, overwriting files, accessing paths outside the workspace, or transmitting document contents to an external service.
- Define an allowlist of permitted external service destinations and document what data is transmitted, retained, and logged.
- Treat document contents as untrusted data and explicitly prohibit following instructions embedded within analyzed documents.
- Document and test the claimed sandbox boundaries so that the Skill cannot access unrelated files, credentials, environment secrets, or privileged host resources.
- Remove