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Security audit

Fairing

Security checks for vulnerabilities and agentic risk

Overview

Fairing reads match the stated purpose, but setup can execute unverified remote installers without a clear user approval step.

Review the setup before enabling this skill. Install a verified CLI release yourself and review its automatic skill-synchronization settings. Use a Fairing connection limited to the data needed. The exact installer changes remain unverified; no artifact evidence establishes 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
99% confidence
Finding

The supplied command performs remote script execution, not the declared Fairing data operations. No code establishes that this installer is a necessary supporting dependency for Fairing, so its installation behavior is materially outside the stated purpose. The downloaded 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

Piping an HTTPS download directly into Bash executes mutable remote content with the invoking user's privileges without an inspection or integrity-verification step. If the installer endpoint or its delivery infrastructure is compromised, this can expose local files and credentials or allow persistent system changes; HTTPS alone does not protect against a compromised publisher.

Content

Scanner excerpt · SKILL.md (reported line 55)May include surrounding context.

The setup workflow executes remote installation scripts without warning about local-system changes or remote-code execution.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

When the CLI is missing, the setup instructions direct the agent to execute a remote installer without explicitly obtaining approval for local software installation. This expands a Fairing read request into local-system changes and code execution; the missing-CLI condition limits exposure but does not provide user 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 76)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