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Security audit

Cn Base64 Tool

Security checks for vulnerabilities and agentic risk

Overview

This is a simple local Base64 utility with user-directed file reads and writes, though its Chinese-only docs include some inaccurate examples and promotional links.

Install only if you are comfortable with Chinese-language documentation and a small local Python script. Use explicit output paths and avoid pointing outputs at important files unless you intend to overwrite them; also note that some examples in the documentation appear stale or unsupported.

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
  • 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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (6)

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The skill name, description, and usage documentation are entirely in Chinese, which can amount to forcing a specific language without user opt-in. The policy allows locale constraints when they are optional or clearly justified, but no such choice or justification is provided here.

Content

No source excerpt is available for this finding.

Missing User Warnings

Low
Category
Not specified by scanner
Confidence
88% confidence
Finding

The skill description states that it supports Base64 encoding/decoding of files, which implies reading from and writing to files, but it does not include any user warning about filesystem effects such as creating or overwriting output files. Under the markdown-file criteria, behaviors that could affect user data or system integrity should be disclosed.

Content

No source excerpt is available for this finding.

Missing User Warnings

Low
Category
Not specified by scanner
Confidence
86% confidence
Finding

The documentation includes a bulk directory operation (encode_dir ./my_folder) but provides no warning that it may process many files and generate outputs across a directory. For markdown descriptions, potentially broad effects on user data should be disclosed so users understand the scope before running the command.

Content

No source excerpt is available for this finding.

Intent-Code Divergence

Low
Category
Not specified by scanner
Confidence
83% confidence
Finding

The document presents the skill as a self-contained Base64 encode/decode utility using only Python standard library features, but the closing section promotes an external commercial site and diagnosis link. This creates an intent/documentation divergence because the file's stated purpose is a local encoding tool, while the documentation also serves unrelated marketing/navigation goals.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
92% confidence
Finding

This code file contains user-facing natural-language descriptions and help text in Chinese only, beginning with the module docstring. The policy requires flagging language or locale constraints when the skill forces a specific language without user opt-in, and there is no indication that users can choose another language or that the Chinese-only interface is intentionally region-scoped.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
95% confidence
Finding

The command description, examples, and argument help strings are all presented in Chinese, which imposes a language choice on users. Because no alternative language, opt-in, or documented locale justification is provided, this is a natural-language policy violation under the language/locale rule.

Content

No source excerpt is available for this finding.