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Security audit

fin-reg-calc

Security checks for vulnerabilities and agentic risk

Overview

The calculator code is simple, but the skill metadata and workflow claim broader write, network/API, and audit-log behavior than the tool consistently declares or implements.

Review before installing. The core script appears to be a local financial-compliance calculator, but install it only if you are comfortable with the broad allowed-tools metadata or after the publisher narrows/removes WebFetch and Write, clarifies whether audit logs or reports are actually written, and documents where any compliance records would be stored.

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 (7)

Intent-Code Divergence

High
Category
Not specified by scanner
Confidence
97% confidence
Finding

The skill declares network: false, filesystem: false, and subprocess: false, yet the risk rationale says it performs API calls, file reads/writes, and local execution. This inconsistency can cause reviewers or runtime policy systems to misclassify the skill's true capabilities, potentially allowing deployment under weaker scrutiny or causing unsafe assumptions about what the skill can do.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
87% confidence
Finding

This is a natural-language locale policy concern because the skill content appears to force a specific language for use and maintenance. The file does not indicate that Chinese is optional, nor does it offer an alternative language path for users or maintainers.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The description and display naming present Chinese as the default user-facing language for the skill, while the policy requires language choice or a documented justification for locale constraints. Although English text exists elsewhere, the file does not state that the user can choose language or that Chinese is required for a region-specific deployment.

Content

No source excerpt is available for this finding.

Intent-Code Divergence

Medium
Category
Not specified by scanner
Confidence
78% confidence
Finding

The documentation says the system will generate a standardized compliance report and write an audit log, which implies persistence or file output. However, the manifested interface and output schema describe only stdout JSON from a CLI tool, with no corresponding implemented logging/reporting behavior shown in this skill file.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The script description, help text, and normal output are hard-coded in Chinese with no language-selection option. This can prevent or delay correct understanding by non-Chinese-speaking operators, which is especially risky in a compliance tool because users may misunderstand suitability decisions or reporting-threshold results and act incorrectly.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
86% confidence
Finding

This markdown includes a full Chinese-only section and licensing block after the English section, but it does not state that language presentation is optional or user-selectable. Under the policy rule for language or locale constraints, forcing a specific language without opt-in can be a natural-language policy violation.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
91% confidence
Finding

The visible natural-language content in this file is entirely in Chinese, including the core description and usage guidance. There is no indication that the skill supports multiple languages, offers user opt-in, or is explicitly limited to a Chinese-language/regional compliance context, which can violate language/locale policy requirements.

Content

No source excerpt is available for this finding.