Back to skill

Security audit

More Trees

Security checks for vulnerabilities and agentic risk

Overview

The More Trees actions have approval safeguards, but setup can execute unverified software with broader effects on installed agent skills.

Review and approve the CLI installation separately. Its current documentation provides OO_SKILLS_SYNC_DISABLED=1 to prevent startup writes to agent skill directories. OOMOL handles your connected account and requests; confirm planting quantities, recipients, and credit costs. The remote installer contents were unavailable for inspection.

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
97% confidence
Finding

The supplied chunk performs no visible More Trees data operations. Instead, it executes an Oomol installation script, with no demonstrated connection to the declared purpose. 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 mutable remote installer directly into Bash executes its contents with the invoking user's privileges without prior inspection or independent integrity verification. Compromise of the distribution endpoint or installer could expose local files and credentials or modify the system; HTTPS and conditional setup reduce some exposure but do not establish artifact integrity. The PowerShell alternative has the same underlying risk.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning about running remote code on the user's system.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

The setup workflow directs execution of downloaded shell or PowerShell code without explaining its local execution scope or requiring explicit user approval. Installation is conditional on a missing CLI, which reduces exposure, but the stated confirmation requirement applies only to More Trees state changes and does not clearly cover local software 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 79)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