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Security audit

Y.GY

Security checks for vulnerabilities and agentic risk

Overview

The Y.GY operations are clearly scoped, but setup can execute changing remote code without asking for approval.

Review before installing. Install and verify the CLI separately, require approval for local setup changes, and review its automatic skill-sync behavior. OOMOL mediates access to your connected Y.GY account. The remote installers were unavailable for inspection, so their exact local effects 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
96% confidence
Finding

The visible code installs software from cli.oomol.com rather than performing Y.GY data operations. Nothing supplied establishes that this installer is a supporting dependency for Y.GY. The remote script's contents and any further behavior cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The curl-to-bash command executes mutable remote content without a pinned version or independent integrity verification; the PowerShell alternative has the same weakness. Compromise of the installer distribution path could execute arbitrary code with the agent process's permissions, exposing accessible files and credentials; HTTPS and the legitimate dependency context do not eliminate that supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 59)May include surrounding context.

The setup workflow executes a remote installation script without warning the user about executing downloaded code or modifying their system.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

When the CLI is missing, the workflow instructs the agent to install it by immediately executing downloaded code, without requiring informed approval for local system changes. The conditional setup path limits exposure, but the write-action confirmation rules concern Y.GY state and do not clearly protect local installation.

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 80)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