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Security audit

Tianyancha

Security checks for vulnerabilities and agentic risk

Overview

The lookup workflow fits its purpose, but setup can execute unverified downloaded code without clear approval for the installation.

Install a reviewed, fixed CLI release yourself and require approval before any downloaded installer runs. Review its bundled-agent-skill behavior and understand that requests use your OOMOL-connected account and may consume credit. The remote installer contents remain unverified; no malicious behavior was established.

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 performs remote script installation and execution, not Tianyancha searching or reading. Nothing in the chunk establishes that this installation supports the declared functionality. The downloaded script's contents and further effects are not provided, so those effects cannot be assessed.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
85% confidence
Finding

The supplied chunk only invokes a CLI login command; it does not implement or invoke Tianyancha searching or reading. Authentication could be a supporting implementation detail, but nothing in this chunk establishes that this login supports Tianyancha access.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping the HTTPS installer directly into bash executes mutable remote content without a pinned version, integrity verification, or an inspection step. A compromised distribution endpoint or release could therefore execute attacker-controlled commands with the agent's local permissions; the legitimate dependency purpose and conditional setup reduce exposure but do not remove this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 78)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

The setup instructions direct the agent to execute downloaded shell or PowerShell code without explaining its effects or requiring explicit approval for local installation. Although limited to a missing-CLI failure, this expands a data-reading task into arbitrary code execution with the invoking user's privileges and could expose files or credentials if the installer is compromised.

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 99)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