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Security audit

Everhour

Security checks for vulnerabilities and agentic risk

Overview

The skill is coherent for managing Everhour, but its first-time setup tells an agent to run unverified remote installer scripts directly in a shell.

Review the installer step carefully before installing. Prefer installing the `oo` CLI from a trusted, documented source with verification, and only run Everhour write or destructive actions after checking the exact payload and effect.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

External Script Fetching

High
Category
Supply Chain
Confidence
95% confidence
Finding

The skill instructs the agent/user to install software by piping a remote script directly into a shell (curl ... | bash). This is dangerous because it executes unverified code from the network without integrity checking, version pinning, or review, so a compromised server, CDN, DNS path, or man-in-the-middle position could lead to arbitrary code execution on the host.

Content

Scanner excerpt · SKILL.md (reported line 66)May include surrounding context.

Static analysis

No suspicious patterns detected.