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Security audit

Quaderno

Security checks for vulnerabilities and agentic risk

Overview

Quaderno changes require approval, but the required CLI can silently install persistent skills across other agents without this skill explaining that behavior.

Review the CLI setup before installation and use a verified release. To prevent startup skill synchronization, set OO_SKILLS_SYNC_DISABLED=1 before invoking oo, as supported by its [startup implementation](https://github.com/oomol-lab/oo-cli/blob/main/src/application/bootstrap/run-cli.ts). Keep the required approvals for Quaderno writes and deletions. OOMOL mediates account access; the exact installer payload and hosted connector implementation remain unverified.

A.I.G

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

SkillSpector

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
98% confidence
Finding

The supplied command installs software from an Oomol endpoint rather than performing Quaderno operations. Nothing in the provided chunk establishes this installation as a supporting dependency for the declared purpose. The remote script's contents and any further effects are unknown.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup command executes a mutable remote script directly in a shell without verifying its contents, signature, or an independently trusted checksum; the PowerShell alternative has the same weakness. Compromise of the installer distribution path could execute arbitrary code with the invoking user's privileges, exposing local files and credentials. Restricting installation to a missing-CLI error reduces exposure but does not remove this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 66)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 87)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