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Security audit

yanlin-news-filter

Security checks for vulnerabilities and agentic risk

Overview

This skill fetches public Sina Finance headlines and filters them locally, with no evidence of hidden access, persistence, or data exfiltration.

Before installing, expect the skill to contact Sina Finance over the network and produce Chinese-language output. It appears safe for its stated purpose, but users needing strict network allowlists or non-Chinese output should review or adapt it first.

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 (2)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
89% confidence
Finding

The skill invokes a Python script that fetches public financial news, which implies network access, but the manifest does not declare any explicit tool scope such as permissions or allowed-tools. This creates an overbroad and ambiguous execution model where the runtime may grant more capability than intended, making it harder to audit, sandbox, or constrain outbound access if the script is modified or abused later.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
93% confidence
Finding

This code file contains natural-language strings that force a specific language/locale for the skill’s description and user-facing output. The policy requires either user opt-in or a clearly justified locale constraint, neither of which is present here.

Content

No source excerpt is available for this finding.