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Security audit

JigsawStack

Security checks for vulnerabilities and agentic risk

Overview

Review the setup before use: it executes changing remote installers, and the required CLI can install other agent skills without this skill explaining those changes.

Before using the skill, install a reviewed, verified CLI release and decide whether to allow its additional skill installations. Upstream documents OO_SKILLS_SYNC_DISABLED=1 to disable startup synchronization in its [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md). Only submit content you intend OOMOL and JigsawStack to process. The review concern is insufficient control over setup and persistent 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 (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command executes a remote installer from a different service. Neither installation nor remote shell execution is disclosed in the declared purpose, and the chunk shows no JigsawStack interaction or evidence that this installer is a supporting dependency. The downloaded script's contents and any further effects are not available for assessment.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
88% confidence
Finding

The supplied chunk only performs a login operation; it contains no JigsawStack search or data-reading behavior. Authentication could be a supporting implementation detail if tied to JigsawStack, but the supplied content establishes no such connection.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The fallback installation command downloads a mutable remote script and immediately executes it without version pinning, independent integrity verification, or review; the PowerShell alternative has the same issue. Compromise of the distribution endpoint or release pipeline could execute attacker-controlled code with the agent process's permissions, although the missing-CLI condition limits when this path is reached.

Content

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

The execution workflow lacks a privacy warning that action payloads can send user-provided text or documents to external services.

Medium
Category
Output Handling
Confidence
90% confidence
Finding

The workflow instructs the agent to submit action payloads through OOMOL to JigsawStack, including potentially private content for text-processing actions. Although the connector is identified, the skill does not warn about disclosure of submitted content and instead labels all untagged actions safe to run directly; read-only operations can still affect privacy.

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