Back to skill

Security audit

Helcim

Security checks for vulnerabilities and agentic risk

Overview

The skill requires confirmation for customer changes, but its setup can execute downloaded software without separate approval or integrity checks.

Review and approve the CLI installation separately before allowing this skill to run its setup commands. Check the CLI's bundled-agent-skill installation behavior and understand that OOMOL mediates access to customer data. The remote installer and hosted service implementation remain outside this artifact review; no malicious behavior was established.

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
98% confidence
Finding

The supplied code performs remote script execution from an Oomol installation endpoint, not Helcim data access. Nothing in the supplied chunk establishes this installer as a supporting dependency for the declared purpose. The downloaded script's contents and any further actions are not visible.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a live HTTPS response directly into Bash executes remote code without verifying an immutable version, checksum, or signature. Compromise of the installer delivery path could enable arbitrary commands, local data theft, or persistent modifications under the invoking user's privileges; HTTPS and conditional setup reduce some exposure but do not establish artifact integrity.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

The setup workflow executes downloaded installer scripts without warning about remote code execution or system changes.

Medium
Category
Output Handling
Confidence
91% confidence
Finding

The setup workflow directs execution of downloaded shell or PowerShell code without requiring installation-specific approval or explaining that it can modify the local system with the invoking user's privileges. The missing-CLI condition limits exposure, but a Helcim data request does not necessarily authorize local software installation; the write-confirmation safeguards cover Helcim state rather than this setup action.

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 79)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