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Security audit

Open Courses

Security checks for vulnerabilities and agentic risk

Overview

This is a simple course-guidance skill with some vague and overbroad wording, but no code, hidden behavior, persistence, credential use, or destructive capability.

Before installing, users should treat this as a Chinese-language course-selection helper and be aware that some described fields sound broader than a simple course guide. Do not provide account credentials or private education records unless a future version clearly explains why they are needed and how they are handled.

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
Vulnerability Patterns
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • 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 (4)

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The natural-language content of the skill is entirely in Chinese and the description presents the skill as operating in that language, but there is no indication that users may choose another language or that the locale restriction is intentional and justified. Under the policy, language constraints should be opt-in or clearly documented as region-specific.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
84% confidence
Finding

The stated purpose is to provide access guidance for NetEase/Bilibili open courses, but the screening items include pass rate, certificate value, and other evaluative criteria, while the update section references exam outlines, instructor teaching plans, and learning-effect feedback. These descriptions suggest a broader exam-preparation or training-advisory service rather than a narrowly scoped open-course guide.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The manifest description at L03 says the skill provides a guide for obtaining NetEase Open Courses/Bilibili knowledge-area courses. However, the documented return fields claim functionality such as mastery analysis, wrong-question notebook sync, lecture download progress, interactive Q&A status, mock exam transcripts, and degree-certification linkage, which goes well beyond a simple acquisition guide and implies learner account tracking or educational management features.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The trigger phrases are so generic that they could match ordinary user requests unrelated to this skill, causing over-invocation or routing the user into an unintended skill context. That increases the chance of prompt hijacking of normal conversations, user confusion, and inappropriate skill activation beyond its intended domain.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.