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Security audit

Amazon Product Reviews by Gecho

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed Amazon review collection workflow that uses a third-party MCP bridge and Chrome extension, with setup and logged-in browser requirements made clear.

Install only if you are comfortable using Gecho's Chrome extension and MCP bridge with a logged-in Amazon browser session. For stronger reproducibility, pin or review the Gecho Bridge package version before configuring the MCP server.

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
  • System Prompt LeakageDirect Leakage, Indirect Extraction, Tool-Based Exfiltration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Direct Prompt Extraction

High
Category
System Prompt Leakage
Confidence
85% confidence
Finding

Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.

Content

Scanner excerpt · SKILL.md (reported line 286)May include surrounding context.

md
Join the [WeCom group](https://github.com/gecho-ai/gecho-bridge/blob/main/qywx.jpg) or use the [1:1 support QR code](https://github.com/gecho-ai/gecho-bridge/blob/main/wx.jpg).

## Output guidelines

For success:
- Say the tool completed.

Rp1

Medium
Category
MCP Rug Pull
Confidence
95% confidence
Finding

The skill instructs users to install and run an MCP server via npx ... @latest, which pulls whatever package version is current at execution time. This creates a supply-chain and reproducibility risk: a future compromised or breaking release could be executed automatically in the user's environment with no review or pinning.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.