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Security audit

Demio

Security checks for vulnerabilities and agentic risk

Overview

The Demio workflow is well scoped, but its setup fallback executes unverified remote installers without clearly obtaining approval for local changes.

Review the setup path before installing. Prefer an independently verified CLI release and explicitly approve local changes. Check and control the CLI's broader skill synchronization, documented in its [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md). OOMOL will mediate Demio access and related attendee data. The bundled instructions were fully inspected, but the external installers and server behavior 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 (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
97% confidence
Finding

The supplied code performs remote installer execution rather than any visible Demio operation. Although installing a CLI could be a supporting implementation detail, this chunk provides no evidence linking the Oomol installer to the declared Demio functionality. The downloaded script's additional behavior cannot be determined from the supplied code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a live HTTPS response directly into bash executes remote code without version pinning or independent integrity verification. Compromise of the distribution endpoint or its supply chain could yield arbitrary code execution with the agent's privileges; the legitimate CLI dependency and missing-command condition narrow exposure but do not eliminate it.

Content

Scanner excerpt · SKILL.md (reported line 59)May include surrounding context.

The fallback setup instructs the agent to execute remotely downloaded installation scripts without warning the user about the system impact.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs the agent to execute a remote installer without first explaining its system-level effects or requesting approval. Although conditional setup is relevant to Demio access, authorization to operate Demio does not necessarily authorize installing arbitrary code on the host; execution could modify files or access data with the agent's privileges.

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 80)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