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Security audit

subtitle-converter

Security checks for vulnerabilities and agentic risk

Overview

This skill is a local subtitle conversion utility that reads user-provided subtitle files and writes converted outputs without hidden network, credential, persistence, or destructive behavior.

Install only if you are comfortable letting the skill read subtitle files or a chosen subtitle directory and write output files. Be careful with explicit --output paths because existing files can be overwritten.

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
  • 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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
84% confidence
Finding

The skill documentation instructs the agent to read input subtitle files and write converted output files, but the manifest does not declare any explicit tool scope such as allowed-tools or permissions. This creates an authorization ambiguity where an agent may use broader file system capabilities than intended, increasing the risk of unintended file access or overwriting files during batch conversion or output operations.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
82% confidence
Finding

This markdown file is entirely presented in Chinese, starting with a Chinese-only title and continuing throughout the document. For a general reference skill, this can amount to a language policy violation because it imposes a specific language without any visible opt-in or indication that the skill is region-specific.

Content

No source excerpt is available for this finding.