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Security audit

mcp-http-auth-fallback-diagnosis

Security checks for vulnerabilities and agentic risk

Overview

This skill gives focused troubleshooting steps for MCP HTTP authentication failures and explicitly tells the agent not to expose credential values.

Install only if you need MCP HTTP auth troubleshooting. Treat credentials carefully, run tests only against servers you are authorized to use, and verify that logs and config files do not contain full tokens.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • 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)

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 30)May include surrounding context.

md
- Diagnosing the final fallback status instead of the first primary-endpoint failure.
- Rotating the external token while leaving a copied Bearer token in client config.
- Claiming interpolation support from general docs without checking header materialization.
- Comparing or logging full tokens; compare presence or equality without exposing values.
- Declaring recovery from a raw HTTP 200 alone; verify through the actual MCP client.