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Security audit

Plunk

Security checks for vulnerabilities and agentic risk

Overview

Review is recommended because setup executes unpinned remote code and the required CLI can automatically install additional persistent agent skills.

Review and verify the CLI installation before allowing setup. Consider disabling startup skill synchronization using the publisher-documented OO_SKILLS_SYNC_DISABLED setting. Understand that OOMOL mediates Plunk access, and retain the skill's confirmation requirements for email, contact changes, and deletion. The remote installer and hosted service remain outside the inspected artifact.

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
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Findings (3)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command installs software from Oomol rather than performing the declared Plunk operations. Nothing in the supplied code establishes this installation as a supporting dependency for Plunk. The remote script's contents are not supplied, so its further behavior cannot be determined.

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 whatever the endpoint supplies with the invoking user's privileges, without a pinned version or independent integrity verification. A compromised distribution endpoint could therefore compromise the local environment; the missing-CLI prerequisite reduces exposure but does not remove this supply-chain risk, and the PowerShell example has the same weakness.

Content

Scanner excerpt · SKILL.md (reported line 62)May include surrounding context.

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 83)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