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Security audit

Base64 Tool

Security checks for vulnerabilities and agentic risk

Overview

This is a narrow Base64 encoder/decoder with no evidence of hidden access, persistence, or data sending.

Before installing, expect a very small local utility for Base64 conversion. Users who need English output or polished packaging may want the maintainer to fix the escaped metadata and add clearer trigger boundaries, but no security-relevant hidden behavior was found.

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
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • 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 (3)

Vague Triggers

Medium
Confidence
93% confidence
Finding
The manifest says to activate whenever the user asks to encode or decode base64, but it does not define any boundaries, exclusions, or narrower trigger phrasing. This can cause unintended invocation for generic requests involving encoding or decoding text without making clear when this skill should not activate.

Vague Triggers

Medium
Confidence
92% confidence
Finding
The usage text says to use the skill when the user asks to encode or decode base64, but it provides no negative examples or constraints to distinguish direct base64 requests from broader encoding-related conversations. Without exclusions, the trigger logic remains ambiguous and may overlap with ordinary assistance requests.

Natural-Language Policy Violations

Low
Confidence
96% confidence
Finding
This code prints all user-facing status and error messages in Chinese, which imposes a specific language on users without any opt-in or configuration. That matches the policy category for language/locale constraints in natural-language content.

Static analysis

No suspicious patterns detected.