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Security audit

portveil

Security checks for vulnerabilities and agentic risk

Overview

This skill gives an assistant disclosed, user-directed control over a Portveil VPN account and does not show hidden or unrelated behavior.

Install only if you want Hermes to manage your Portveil VPN. Create a dedicated Portveil token for Hermes, start with read scope, upgrade to control or admin only when needed, and revoke the token if the machine is no longer trusted.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Rogue AgentSelf-Modification, Session Persistence
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Session Persistence

Medium
Category
Rogue Agent
Confidence
60% confidence
Finding

Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Content

Scanner excerpt · SKILL.md (reported line 33)May include surrounding context.

md
homepage: https://portveil.com
    emoji: "🛡️"
setup:
  help: "Start free at https://portveil.com/free/ (no card). Then in the dashboard (https://portveil.com/dashboard/) create an API token: read to look, control to move devices, admin to add devices."
  collect_secrets:
    - env_var: PORTVEIL_TOKEN
      prompt: "Portveil API token (starts with clt_)"

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 187)May include surrounding context.

md
and timezone).
- To check the machine you're running on: `curl -s https://portveil.com/cdn-cgi/trace` gives
  the `ip=` and `loc=` sites see. Compare the IP with every exit in
  https://api.portveil.com/v1/exits, and say which exit it matches or that it matches none.
- Never print, log or repeat the API token, the account key or a device's private key.

## Verification

Static analysis

No suspicious patterns detected.