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Security audit

seed-calendar-planner

Security checks for vulnerabilities and agentic risk

Overview

This skill is a local vegetable-garden calendar planner with disclosed Python commands and no evidence of hidden access, persistence, network use, or data exfiltration.

Before installing, understand that the skill asks your agent to run a local Python script and use your crop list, household size, and frost dates. Verify frost dates with local extension or NOAA data, but no sensitive account, credential, network, or persistent access is evident in the reviewed artifacts.

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
  • Behavioral ASTexec() Call, eval() Call, Dynamic Import
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (2)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
85% confidence
Finding

The skill exposes shell-based commands in its documented interface but does not declare an explicit tool scope such as allowed-tools or permissions. In an agent environment, that omission can let the orchestrator or user invoke broader shell capabilities than the skill strictly needs, increasing the chance of unintended command execution or misuse if the skill is combined with untrusted input.

Content

No source excerpt is available for this finding.

subprocess module call

Medium
Category
Dangerous Code Execution
Confidence
70% confidence
Finding

subprocess module calls execute external commands. Without careful input validation, this enables command injection.

Content

Scanner excerpt · scripts/test_seed_calendar.py (reported line 16)May include surrounding context.

python
def run_cli(args):
    return subprocess.run([sys.executable, ENGINE] + args,
                          capture_output=True, text=True)