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Security audit

xinjianxue-skill-teach_fit-cn

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed paid API integration for a Chinese education-advice service and does not show hidden execution, exfiltration, or persistence beyond storing its own service credentials.

Install only if you intend to use Xinjianxue's China-region service and are comfortable sharing the listed birth, gender, and location details with that provider and spending account credits per report. Treat the one-time authorization code and generated API credentials as sensitive account credentials.

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
  • 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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

Natural-Language Policy Violations

Medium
Confidence
82% confidence
Finding
The file hard-codes the API base URL to `https://chinaapi.xinjianxue.com`, and the surrounding instructions are written as mandatory operational requirements for this China-specific service flow. While the skill later says user-facing output should use the user's native language, it does not offer an explicit opt-in or explain a justified region-specific limitation for requiring this locale/service domain.

Static analysis

No suspicious patterns detected.