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Security audit

Envoy

Security checks for vulnerabilities and agentic risk

Overview

Review is needed because this Envoy reader directs unchecked software installation and uses a CLI that can also change persistent agent skills.

Install and verify a specific CLI release yourself before use. Disable its automatic skill synchronization using OO_SKILLS_SYNC_DISABLED=1, as documented in the [CLI command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md). Connect only the Envoy account you intend OOMOL to access. Remote installer contents and hosted connector code remain outside the verified 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
  • 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 performs remote script execution for an Oomol installer, with no visible Envoy interaction. This introduces installation and arbitrary remote-code execution capabilities not represented by the declared read/search purpose. The downloaded script's specific effects cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a mutable network response directly into Bash without pinning or independently verifying the downloaded code; the PowerShell alternative has the same execution pattern. Compromise of the installer distribution could execute attacker-controlled commands with the agent's local privileges, exposing accessible files and credentials despite Envoy tokens being injected server-side.

Content

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

Fallback setup executes downloaded installation scripts without a system-integrity warning.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The fallback directs the agent to install software after a missing-command error without explicitly obtaining approval or explaining that downloaded code will modify the local environment. This crosses the boundary from reading Envoy data to executing installation code; the conditional trigger limits exposure, but does not establish user authorization.

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 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