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Security audit

kimchi-premium for BTC

Security checks for vulnerabilities and agentic risk

Overview

This skill does what it says: it fetches public market prices and an exchange rate to calculate Bitcoin's Kimchi Premium.

Before installing, understand that the skill makes outbound requests to exchange-rate, Upbit, and Binance APIs whenever run. This is expected for live pricing, but users who do not want external market API calls should not run it.

A.I.G

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

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (2)

External Transmission

Medium
Category
Data Exfiltration
Content
try {
    const [rateData, upbitData, binanceData] = await Promise.all([
      fetchJson('https://open.er-api.com/v6/latest/USD'),
      fetchJson('https://api.upbit.com/v1/ticker?markets=KRW-BTC'),
      fetchJson('https://api.binance.com/api/v3/ticker/price?symbol=BTCUSDT')
    ]);
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
const [rateData, upbitData, binanceData] = await Promise.all([
      fetchJson('https://open.er-api.com/v6/latest/USD'),
      fetchJson('https://api.upbit.com/v1/ticker?markets=KRW-BTC'),
      fetchJson('https://api.binance.com/api/v3/ticker/price?symbol=BTCUSDT')
    ]);

    const result = calculatePremium(rateData, upbitData, binanceData);
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Static analysis

No suspicious patterns detected.