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Security audit

Audio Processing

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed local audio-processing toolkit with a clearly gated remote TTS option and no evidence of hidden persistence, exfiltration, or destructive behavior.

Review the optional TTS behavior before use: text passed to TTS is sent to Google only when --allow-network is supplied, so avoid using that mode for secrets or confidential transcripts. Local transcription may require model/dependency downloads during setup or first use.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Behavioral ASTexec() Call, eval() Call, Dynamic Import
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (2)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
89% confidence
Finding

The skill invokes local executables (python3, ffmpeg) and documents shell-based usage, but the manifest does not declare any explicit tool scope such as permissions or allowed-tools. This creates a mismatch between declared and actual capabilities, which can cause an agent or reviewer to underestimate what the skill is able to execute and weakens policy enforcement around shell access.

Content

No source excerpt is available for this finding.

subprocess module call

Medium
Category
Dangerous Code Execution
Confidence
70% confidence
Finding

subprocess module calls execute external commands. Without careful input validation, this enables command injection.

Content

Scanner excerpt · tool.py (reported line 62)May include surrounding context.

python
if not shutil.which("ffmpeg"):
        return False, "ffmpeg not found in PATH"
    try:
        process = subprocess.run(
            ["ffmpeg", "-nostdin", "-hide_banner", "-y", *args],
            check=True, capture_output=True, text=True, timeout=900,
        )