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Security audit

Utilia Audio Normalization

Security checks for vulnerabilities and agentic risk

Overview

This skill is purpose-aligned for paid audio normalization, but it asks users to run a downloaded npm client with Solana wallet credentials available.

Install only if you are comfortable using Utilia's remote service and npm client. Use a dedicated low-balance Solana wallet with no unrelated authority, prefer a keypair file over an environment private key, verify the package and destination independently, and approve only public audio URLs you intend to send to Utilia.

A.I.G

Vulnerability Patterns
  • Insecure DependenciesIntroduces malicious components through unsafe dependency sources
  • 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
Findings (1)

T08 · Insecure Dependencies

Warning
Location
SKILL.md:9
Finding

Automatically Downloaded npm Package Executes with Access to Wallet Credentials

Content
View full analysis
\ --output normalized.mp3 ``` For another target or a shorter bound: ```sh npx -y utilia-solana-agent@0.5.7 audio-normalize \ --output normalized.mp3 --target-lufs -18 --max-seconds 90 ``` ``` ### Technical Analysis The Skill instructs the agent to use `npx -y`, which may automatically download and execute the specified npm package without interactive confirmation. Pinning the package to version `0.5.7` reduces unintended version drift, but the package source, dependency lockfile, and integrity metadata are not included in the audited project. Consequently, this audit cannot verify the package's claims regarding payment limits, transaction construction, local signing, digest verification, output-file protections, or handling of wallet secrets. This is particularly sensitive because the package is expected to run ...[truncated 2204 chars]
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 9)May include surrounding context.

md
# Utilia Audio Normalization

Use the guarded npm client. It signs only exact Solana-mainnet USDC payments to
Utilia's published wallet, with a hard maximum of $0.01 per call. Never ask the user
to paste a private key into chat or a command. Require either `SOLANA_KEYPAIR_PATH`
or `SOLANA_PRIVATE_KEY` to already be set in the local environment.

External Transmission

Medium
Category
Data Exfiltration
Confidence
86% confidence
Finding

The skill directs the agent to send a user-supplied audio URL to a third-party remote MCP endpoint, which is an external data transmission. Even though the input is limited to a public HTTPS URL and the skill discusses retention limits, this still creates privacy, metadata exposure, and supply-chain trust risk because user requests and associated identifiers are disclosed to an external service.

Content

Scanner excerpt · SKILL.md (reported line 56)May include surrounding context.

md
- Processing: audio only; video tracks and metadata are removed.

If the user needs raw structured output instead of a file, call the remote MCP tool
`normalize_audio` at `https://api.utilia.ink/mcp` with `url`, `targetLufs`, and
`maxSeconds`.

Static analysis

No suspicious patterns detected.