Security audit

Minecraft Monitor

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward Minecraft server status checker, with limited risks from trusting responses from the server being checked.

Reasonable to install for manual Minecraft server checks. Use caution when pointing it at untrusted servers, especially in automated monitoring, because a hostile endpoint could hang or exhaust the checker process or print misleading terminal output.

A.I.G

Vulnerability Patterns

Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
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

Findings (2)

T09 · Insecure Skill Coding Practices

Warning

Location: scripts/minecraft-status.py:31
Finding: Unbounded parsing of attacker-controlled protocol response lengths
Content: View full analysis
Remediation: View remediation
MAX_RESPONSE_SIZE: raise ValueError("Invalid response length") chunks = [] remaining = size while remaining: chunk = sock.recv(min(remaining, 65536)) if not chunk: raise IOError("Connection closed before response completed") chunks.append(chunk) remaining -= len(chunk) return b"".join(chunks) ``` ]]>

T09 · Insecure Skill Coding Practices

Note

Location: scripts/minecraft-status.py:121
Finding: Terminal control-sequence injection through remote server metadata
Content: View full analysis
5 else "")) if 'motd' in status and status['motd']: motd = status['motd'].strip() if motd: print(f" MOTD: {motd[:80]}{'...' if len(motd) > 80 else ''}") ``` ### Technical Analysis Player names and MOTD content are received from an untrusted remote server and printed directly to the user's terminal. Limiting the MOTD to 80 Python characters does not neutralize embedded ANSI escape sequences, carriage returns, backspaces, newlines, or other terminal control characters. A malicious server can use these characters to alter colors, move the cursor, clear previous output, overwrite status text, create deceptive terminal content, or corrupt logs that consume the command output. The precise effects depend on the terminal emulator and downstream log viewer. The same issue applies to sampled player names, which are joined and printed without normalization or type and character validation. ### Attack ...[truncated 1163 chars]
Remediation: View remediation

SkillSpector

Vulnerability Patterns

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
Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep

Static analysis

No suspicious patterns detected.