T05 · Unauthorized Access and Privilege Escalation
- Location
SKILL.md:17- Finding
Unnecessary Command Execution and Broad Filesystem Capabilities
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 17–22
Vulnerability Type: Excessive tool permissions and violation of least privilege
Risk Level: MediumVulnerable Code
yaml tools: - read - exec - write - glob - grepTechnical Analysis
The Skill declares unrestricted command-execution capability through
exec, together with broad filesystem reading, writing, discovery, and search capabilities. Its documented purpose is to review, format, score, and return corrected InterSystems IRIS/Cache ObjectScript code. The documentation does not define a necessary command, compiler invocation, executable component, command allowlist, filesystem boundary, or sandbox policy that would justify these capabilities.Merely declaring these tools does not prove that commands are automatically executed. However, exposing them unnecessarily expands the authority available during Skill execution. If attacker-controlled source code or embedded instructions influence the agent, the available tools could be misused beyond the legitimate formatting task.
Attack Path
- The Skill is loaded with the declared
exec,read,write,glob, andgrepcapabilities. - An attacker submits ObjectScript code or related content containing adversarial instructions designed to influence the agent.
- The agent interprets the malicious content as actionable instructions rather than inert source code.
- Because
execand broad filesystem tools are available, the agent may execute local commands, enumerate files, read unrelated project data, or modify accessible files. - Any resulting access is bounded by the operating-system privileges and sandbox restrictions of the hosting agent process.
This exploitation path is conditional on the host exposing the declared tools without effective confirmation, sandboxing, or policy enforcement. The audited file contains no direct command payload or demonstrated automatic execution sequence.
Impact Asses
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- The Skill is loaded with the declared
- Remediation
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Remediation Suggestions
- Remove
execbecause no command execution is required by the documented formatting and review workflow. - Prefer accepting ObjectScript code directly from the user and returning corrected text without filesystem access.
- If file processing is required, limit
read,write,glob, andgrepto an explicitly approved project directory and deny traversal outside that boundary. - Require explicit user confirmation before overwriting files, and write corrected output to a separate file by default.
- Treat reviewed source code and comments as untrusted data, never as agent instructions.
- If compilation is later introduced, invoke a fixed executable with structured arguments, enforce a strict command allowlist, reject shell metacharacters, and run it in an isolated sandbox with minimal operating-system permissions.
- Document the precise reason for every retained tool and enforce the same least-privilege policy in the host-agent configuration.
- Remove