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Security audit

utility-bill-analyzer

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward local utility-bill tracker with no hidden network, credential, persistence, or destructive behavior found.

Before installing, understand that the skill stores utility usage and cost data locally. Prefer the default database or a clearly chosen non-sensitive --db path, and keep backups if the data matters.

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
  • 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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
89% confidence
Finding

The skill advertises executable commands that read from and write to local files (scripts/bills.json and optional --db <path>) but does not declare any tool scope such as permissions or allowed-tools. That creates an authorization gap: an agent or reviewer cannot tell from the manifest that the skill needs filesystem access, increasing the chance of unintended file access or execution in a broader-than-expected environment.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.