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Security audit

Nginx Config Linter

Security checks for vulnerabilities and agentic risk

Overview

This skill is a local nginx configuration linter that reads user-selected config files and reports issues without network use, persistence, or hidden mutation.

Install only if you are comfortable letting the skill read nginx configuration files you explicitly pass to it. Treat reports as local diagnostic output, and avoid using recursive mode on directories that contain unrelated private configs.

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 (1)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
88% confidence
Finding

The skill advertises commands that read arbitrary local nginx configuration paths and the analyzer detected file_read and network-capable behavior, but the manifest does not declare any tool scope restrictions such as permissions or allowed-tools. That creates unnecessary ambiguity about what the skill is allowed to access and increases the risk of overbroad file access or unintended network use when the skill is invoked in an agent environment.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.