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Security audit

Harmonic.ai

Security checks for vulnerabilities and agentic risk

Overview

The Harmonic integration fits its purpose, but its setup instructions can execute downloaded software without clear user approval or limits on local changes.

Review and approve CLI installation separately before allowing this skill to perform setup. Use a verified release, check which agent skills it installs, and connect only the intended Harmonic account. OOMOL mediates requests and credentials. The concern is insufficient control over dependency installation; the inspected artifact does not establish malicious intent.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied chunk performs remote software installation, not Harmonic.ai search or data retrieval. Nothing shown establishes that this installer is a supporting dependency for the declared functionality. The downloaded script's contents are unavailable, so its additional effects cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a remotely fetched, unpinned installer directly into Bash; the Windows alternative similarly evaluates downloaded code. If the distribution endpoint or release infrastructure is compromised, attacker-controlled code could run with the agent process's permissions and access local files or credentials; HTTPS and the legitimate integration purpose do not establish artifact integrity.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

Fallback setup executes remotely downloaded installation scripts without warning the user about local system changes.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

A missing CLI triggers instructions to install software without first obtaining approval for local system changes. Although this fallback is conditional and relevant to the integration, authorization to read Harmonic.ai data does not necessarily authorize installing and executing software on the user's machine.

Content

No source excerpt is available for this finding.

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 81)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources