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Security audit

Doctor Nexus Filesystem

Security checks for vulnerabilities and agentic risk

Overview

This is a filesystem help skill with disclosed search and batch file-operation examples, and I found no hidden execution, persistence, credential handling, or data exfiltration.

Install this only if you want the agent to use shell-style filesystem workflows. Before allowing batch edits, moves, or deletes, confirm the target directory and file list, prefer dry runs or backups, and avoid sudo or system directories unless you explicitly intend that level of access.

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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (3)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The skill description is very broadly worded and could activate for many normal file-related tasks, causing this powerful skill to be invoked more often than necessary. Because the skill includes destructive filesystem operations like move and delete, overbroad routing increases the chance of accidental misuse or unsafe autonomous execution.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill body is presented in Chinese while the manifest metadata is in English, and there is no indication that Chinese is optional or that the skill is region-specific. This creates a language/locale policy concern because the skill appears to impose a specific language without user opt-in.

Content

No source excerpt is available for this finding.

Sudo/Root Execution

Medium
Category
Privilege Escalation
Confidence
70% confidence
Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · SKILL.md (reported line 339)May include surrounding context.

md
- 考虑使用 `rm -i` 交互式删除

⚠️ **权限注意**:
- 某些操作可能需要 sudo
- 系统目录操作要谨慎
- 考虑文件权限问题

Static analysis

No suspicious patterns detected.