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Security audit

DefiLlama Yields OpenAPI Skill

Security checks for vulnerabilities and agentic risk

Overview

This skill is a scoped, read-only helper for querying public DefiLlama yield data through UXC.

Before installing, be comfortable with UXC creating a reusable local CLI alias and fetching the OpenAPI schema from the listed GitHub URL. The skill is intended for public read-only DefiLlama yield queries and should not need credentials or write access.

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 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 (1)

Tp4

High
Category
MCP Tool Poisoning
Confidence
96% confidence
Finding

The description says the skill operates DefiLlama public yield APIs through UXC with guardrails, implying runtime API interaction functionality. The actual code chunk only validates that supporting files exist and contain expected strings and schema paths. This is a build/QA or packaging helper, not the API-operating behavior described. While the validation supports the skill, the primary purpose of this code chunk is materially different from the declared purpose, so this should be flagged as a mismatch.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.