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Security audit

Meituan

Security checks for vulnerabilities and agentic risk

Overview

The Meituan search workflow fits its purpose, but fallback setup executes unverified downloaded code without a clear approval step.

Review the fallback setup before installing. Install a pinned, verified CLI release yourself and require approval for subsequent installation changes. Check the CLI's automatic skill synchronization settings. Meituan requests use your OOMOL-connected account and may consume credit. The bundled artifact shows no malicious behavior, but the downloaded installers remain uninspected.

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 code only invokes a login command and shows no connection to Meituan or implementation of the declared search and reading functions. Authentication could support such functionality, but the supplied chunk provides no evidence that this login is a supporting step for Meituan access.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
96% confidence
Finding

The skill directs the agent to install software by executing remotely fetched scripts when the CLI is missing, expanding a data-reading task into local code execution. Conditional setup makes this less suspicious than unconditional execution, but it does not require explicit installation approval or verify the downloaded code; this overlaps with the installer findings below.

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 executes whatever script the remote endpoint serves without pinning or integrity verification. HTTPS protects transport but not against a compromised publishing endpoint or malicious script update, which could yield arbitrary code execution under the agent's local account.

Content

Scanner excerpt · SKILL.md (reported line 55)May include surrounding context.

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

Medium
Category
Output Handling
Confidence
96% confidence
Finding

Both setup examples execute downloaded scripts directly without an inspection, integrity-verification, or explicit approval step. Such scripts run with the invoking user's privileges and could modify files or access credentials; the missing-CLI condition limits exposure but does not constrain their effects.

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 76)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