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Security audit

Maxio Advanced Billing

Security checks for vulnerabilities and agentic risk

Overview

The billing lookups fit the stated purpose, but setup can execute unverified remote installers without a separate approval step.

Review setup before installing. Independently verify and approve the CLI installation, and decide whether its automatic skill synchronization is acceptable. The publisher documents OO_SKILLS_SYNC_DISABLED as a control in its [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md#environment-variables). Connect only the intended Maxio account and consider OOMOL's access to its billing data. Remote installer contents remain unverified; no malicious behavior was established in the bundled artifact.

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 command performs remote script execution, not the declared Maxio data-access function. Nothing in the chunk establishes that this installer is a supporting dependency for Maxio access. The downloaded script's contents and any further effects are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
99% confidence
Finding

Piping the HTTPS response directly into Bash executes whatever code the installation endpoint returns, without prior inspection or integrity verification. A compromised endpoint or release pipeline could therefore turn a read-only billing request into local arbitrary code execution; this is the same underlying installation risk identified by SQP-2, not an independent exploit.

Content

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

The fallback setup instructs execution of remotely downloaded installation scripts without warning about the system-integrity implications.

Medium
Category
Output Handling
Confidence
97% confidence
Finding

The fallback instructs an agent to execute downloaded shell or PowerShell code without explicit installation approval, a pinned version, or artifact verification. If the distribution endpoint is compromised, that code could access local files and credentials or modify the system with the executing user's privileges; the missing-CLI condition limits exposure but does not remove the risk.

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