Back to skill

Security audit

Linkly

Security checks for vulnerabilities and agentic risk

Overview

The Linkly actions have clear safeguards, but setup directs remote code execution without clear approval and may introduce broader changes to your agent.

Review the setup behavior before installing. Install a verified CLI version separately, review or disable its automatic skill synchronization, and understand that OOMOL processes the Linkly requests. Keep the skill's confirmation requirements for changes and deletion. The concern is uncontrolled setup and broader agent changes; the artifact does not establish malicious intent.

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 command targets Oomol infrastructure rather than Linkly and executes an external installer. Nothing in the supplied chunk establishes this installation as a supporting dependency for Linkly functionality. The remote script's contents are unavailable, so its specific effects cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a mutable remote script directly into Bash without verifying its contents, signature, or version; the PowerShell alternative has the same weakness. If the distribution endpoint or delivery pipeline is compromised, the installer can execute attacker-controlled code with the agent's local privileges, exposing accessible files and credentials. The legitimate dependency context and missing-command prerequisite reduce exposure but do not establish script integrity.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

Automatic CLI setup executes downloaded scripts without warning the user about local system changes.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

The fallback directs the agent to install software after a missing-command error without requiring approval for local system changes. Although this is a legitimate dependency and only a conditional fallback, a request to manage Linkly data does not necessarily authorize installing software or executing a downloaded installer.

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 81)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