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Security audit

LoyJoy

Security checks for vulnerabilities and agentic risk

Overview

The LoyJoy workflow is coherent, but its setup can execute changing remote code and introduce broader agent changes without clear user approval.

Review and approve CLI installation separately, including any additional agent skills it installs or updates. Prefer a verified, fixed release and connect only the LoyJoy access you need. Keep confirmation enabled for writes. The bundled instructions were fully inspected, but the remote installer contents remain unverified.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command executes an Oomol-hosted installer and contains no LoyJoy interaction. Nothing in the supplied content establishes that installing this software supports the declared LoyJoy functionality, so this is a material mismatch rather than a demonstrated supporting implementation detail. The remote script's contents and any further effects are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command streams a mutable remote script directly into Bash without pinning a version or independently verifying its integrity; the PowerShell alternative has the same execution pattern. If the distribution infrastructure is compromised, following this setup instruction can execute attacker-controlled code with the agent's local privileges, potentially exposing files and credentials; HTTPS and a relevant vendor domain do not eliminate this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 61)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning the user about the system-level effects.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

The fallback instructs the agent to install software after a missing-command error without first explaining local changes or obtaining explicit installation approval. A user requesting LoyJoy data operations has not necessarily authorized executing downloaded code or modifying their environment; the conditional trigger limits exposure but does not establish consent.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 82)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources