Back to skill

Security audit

Fast Note Sync

Security checks for vulnerabilities and agentic risk

Overview

The note-management controls are clear, but setup directs the agent to execute unverified downloaded code without explicit installation approval.

Review the CLI installation separately before enabling setup, and require approval before executing downloaded installers. Check its automatic bundled-skill installation behavior. Connecting your account permits access to private notes through OOMOL; retain the skill's explicit approval requirements for changes and deletions. The installer and remote connector implementation were not verified.

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
98% confidence
Finding

The supplied code performs remote installer execution, not Fast Note Sync operations. Although dependency installation can be a supporting implementation detail, nothing in this chunk establishes that the Oomol installer supports the declared service. The downloaded script's contents and any further effects are not visible.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a remotely fetched script directly into bash executes mutable third-party code with the invoking user's permissions, without inspecting or independently verifying it. A compromised distribution endpoint could therefore execute arbitrary commands or access local secrets; the PowerShell alternative has the same underlying risk, although there is no evidence here that either endpoint is malicious.

Content

Scanner excerpt · SKILL.md (reported line 68)May include surrounding context.

Fallback setup executes remotely downloaded installer scripts without warning about local system changes or third-party code execution.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The missing-CLI fallback directs the agent to execute third-party installer code without requiring informed approval for local software installation. Restricting installation to a missing-dependency error reduces exposure, but consent to manage notes does not necessarily authorize executing an installer or modifying the local environment.

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 89)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