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Security audit

Zeplin

Security checks for vulnerabilities and agentic risk

Overview

Review is needed because this Zeplin reading skill can trigger remote software installation and broader changes to installed agent skills.

Review and approve CLI installation separately, and understand that OOMOL handles access to your connected Zeplin data. To prevent automatic changes to other agents' skills, the CLI documents setting OO_SKILLS_SYNC_DISABLED=1 for every invocation. The remote installer and hosted connector implementation remain unverified. See the [documented environment controls](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md#environment-variables).

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 shows no Zeplin access or data-reading behavior. It instead executes an external installation script, with no demonstrated connection to the declared Zeplin purpose. The downloaded script's contents and resulting system changes are not visible in the supplied chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command streams a mutable remote script directly into Bash without a pinned version or independent integrity verification; the PowerShell alternative has the same execution pattern. Compromise of the installer distribution infrastructure could execute attacker-controlled code with the agent process's permissions, potentially exposing accessible files and credentials. HTTPS and the legitimate setup context reduce some risks but do not establish the integrity of the code being executed.

Content

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

The setup workflow executes downloaded installation scripts without warning about their system-level effects.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

The missing-CLI fallback directs installation without explaining that downloaded code will execute locally or requiring explicit approval for that change. Although setup is conditional and relevant to the task, a request to read Zeplin data does not necessarily authorize installing software or modifying the local environment.

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