Back to skill

Security audit

MQTT

Security checks for vulnerabilities and agentic risk

Overview

The MQTT workflow is clearly scoped, but its setup can execute changing third-party installation code without separate user approval.

Review the CLI installation separately before allowing setup. Prefer a reviewed, version-pinned release with verified integrity, and check its automatic agent-skill synchronization settings. MQTT traffic uses the disclosed OOMOL integration; confirm the destination topic, payload, and effect before publishing. Only the skill instructions were bundled, so the downloaded installer's exact effects remain unverified.

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
97% confidence
Finding

The supplied chunk performs remote script execution rather than MQTT operations. Nothing in the chunk establishes that this installation is a supporting implementation detail required for MQTT access. The downloaded script is not provided, so its specific system changes cannot be assessed.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
90% confidence
Finding

The supplied chunk contains only a login command and shows no MQTT interaction or connection between that login and an MQTT service. Authentication could support an MQTT workflow, but no such workflow is present in the supplied code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The curl-to-bash command immediately executes whatever code the installation endpoint returns, without a pinned version or independent integrity verification. HTTPS protects transport but does not prevent a compromised distribution endpoint from supplying code that accesses local files, credentials, or other resources available to the invoking user; the PowerShell alternative has the same underlying risk.

Content

Scanner excerpt · SKILL.md (reported line 56)May include surrounding context.

The setup workflow executes remote installation scripts without warning the user about the system-integrity risk.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

The fallback setup directs the agent to execute downloaded shell or PowerShell code without explaining its host-level effects or requiring explicit installation approval. Although this is a legitimate dependency setup path rather than evidence of malicious intent, a missing CLI can trigger system changes beyond the user's requested MQTT operation.

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 77)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