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Security audit

OnceHub

Security checks for vulnerabilities and agentic risk

Overview

The OnceHub features fit the stated purpose, but setup can execute downloaded software without a clear approval or verification step.

Review setup before use. Prefer manually installing a verified, pinned CLI release and explicitly approving local changes. Review its automatic agent-skill synchronization controls. Connect only the OnceHub account and permissions you need, understanding that OOMOL mediates access. The remote installers and live backend were not verified; 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 command contains no OnceHub access or search/read functionality. Instead, it executes an external installation script. No connection between this installer and the declared OnceHub functionality is established in the supplied chunk, making this a material purpose and resource mismatch. The remote script's further behavior cannot be determined from this command alone.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a mutable remote script directly into Bash without version pinning or independent integrity verification; the PowerShell alternative uses the same download-and-execute pattern. If the distribution endpoint or release pipeline is compromised, attacker-controlled code could run with the invoking user's access, although the legitimate setup context provides no evidence of malicious intent.

Content

Scanner excerpt · SKILL.md (reported line 57)May include surrounding context.

The setup fallback executes downloaded installation scripts without warning about their system-level effects.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The missing-CLI fallback instructs installation without first explaining local system changes or requiring user approval, extending a read-only data request into local software execution. Restricting this fallback to a command-not-found error reduces exposure, but does not establish authorization to modify the environment.

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 78)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