T05 · Unauthorized Access and Privilege Escalation
- Location
SKILL.md:26- Finding
Excessive Read, Write, and Command-Execution Permissions
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 26-29
Vulnerability Type: Excessive tool permissions and violation of least privilege
Risk Level: MediumVulnerable Code
yaml tools: - read - exec - writeTechnical Analysis
The skill declares unrestricted
read,exec, andwritecapabilities even though its stated purpose is to generate HTML, CSS, and JavaScript frontend designs. Arbitrary command execution and broad filesystem access are not inherently required to generate frontend code.No technical controls are defined to limit readable or writable paths, constrain commands to an allowlist, require user approval for sensitive operations, or enforce execution inside a sandbox. Although the document recommends allowlisting commands elsewhere, this is descriptive guidance rather than an enforced security control.
The repository contains no executable implementation demonstrating active abuse of these permissions. Nevertheless, granting these capabilities establishes an excessive privilege boundary: adversarial or untrusted design input could influence an agent into using the declared tools for operations unrelated to frontend generation.
Attack Path
- An AI agent loads the skill and grants its declared
read,write, andexectools. - An attacker supplies a crafted frontend-design request containing adversarial instructions.
- The request attempts to induce the agent to read files outside the intended project scope, overwrite local files, or invoke a system command.
- Because the skill defines no enforced path restrictions, command allowlist, or approval checkpoint, the agent may perform the requested operation with its available permissions.
- Any resulting access is limited by the operating-system privileges and sandbox restrictions of the agent process, but may extend beyond the legitimate frontend-generation task.
Impact Assessment
Successful e ...[truncated 649 chars]
- An AI agent loads the skill and grants its declared
- Remediation
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Remediation Suggestions
- Remove
execbecause command execution is not necessary for producing frontend source code. - Remove
readunless the user explicitly asks the skill to inspect existing project files. - Grant
writeonly when file output is requested, and restrict writes to a user-approved workspace or output directory. - Require explicit user confirmation before reading existing files, overwriting content, or invoking any external process.
- If command execution is indispensable for optional validation, enforce a small allowlist of fixed commands and arguments without shell interpolation.
- Run all validation in a restricted sandbox with network access disabled, a read-only host filesystem, resource limits, and a dedicated non-privileged identity.
- Reject path traversal and canonicalize paths before every file operation.
- Document each required capability and its security boundary so that agent platforms can grant tools per operation rather than for the entire skill session.
- Remove