T05 · Unauthorized Access and Privilege Escalation
- Location
SKILL.md:36- Finding
Excessive Tool Permissions Violate Least Privilege
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 36–39
Vulnerability Type: Excessive filesystem and command-execution permissions
Risk Level: MediumVulnerable Code
yaml tools: - read - exec - writeTechnical Analysis
The skill declares filesystem read, filesystem write, and command-execution capabilities, although the package contains only a Markdown instruction file and provides no implementation demonstrating a legitimate need for these privileges. Prompt optimization and music-generation guidance do not inherently require unrestricted local filesystem access or operating-system command execution.
This violates the principle of least privilege. In an Agent platform that grants capabilities according to this declaration, the skill would have a broader authority boundary than its documented purpose requires. The file also identifies the skill as
MD+execute()at line 133, but it defines no executable workflow that justifies command execution.No direct malicious command, credential theft, persistence mechanism, or data-exfiltration instruction was found. The vulnerability is the unnecessary exposure of privileged tools, which creates an exploitable capability if untrusted contextual instructions influence subsequent Agent behavior.
Attack Path
- An Agent loads the skill and grants the declared
read,write, andexectools. - The Agent processes attacker-controlled content, a malicious prompt, or another untrusted contextual instruction during the skill session.
- That content induces the Agent to invoke one of the unnecessarily available tools.
- The Agent reads sensitive local files, modifies accessible data, or executes a local command under the permissions of the hosting process.
- The resulting confidentiality, integrity, and potentially availability impact extends to resources accessible by the Agent account.
Impact Assessment
Successful explo ...[truncated 587 chars]
- An Agent loads the skill and grants the declared
- Remediation
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Remediation Suggestions
- Remove
exec,read, andwritefrom the tool declaration unless each capability is essential to a concrete, documented workflow. - Prefer a dedicated music-generation API tool with a narrow schema instead of general-purpose command execution.
- If file access is required, restrict it to explicit input and output directories and reject path traversal, symbolic-link escapes, and access to credentials or configuration files.
- If command execution becomes essential, use a sandbox with an explicit command and argument allowlist. Never construct shell commands from user-controlled input.
- Require user confirmation for sensitive reads, writes, destructive operations, and command execution.
- Run the Agent under a minimally privileged operating-system account with network, filesystem, process, and resource restrictions.
- Update the
MD+execute()classification and documentation so they accurately reflect the final, minimized capability set. - Add security tests confirming that untrusted prompts cannot trigger access outside approved resources.
- Remove