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Security audit

Ordinal

Security checks for vulnerabilities and agentic risk

Overview

The Ordinal reading features fit the stated purpose, but missing software can trigger unverified remote installation without a separate approval step.

Review and approve CLI installation separately before enabling this skill. Inspect a fixed installer or release, review its bundled-skill changes, and restrict the connected Ordinal account to the access you need. Ordinal requests pass through OOMOL and may incur usage charges. The remote installer contents and hosted connector behavior were not verified; the 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 installs software through a download-and-execute pipeline rather than performing the declared Ordinal operations. Nothing in the supplied chunk establishes this installation as a supporting dependency for Ordinal. The downloaded script's contents and further effects are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

Piping an HTTPS response directly into Bash executes mutable remote content without verifying a pinned version, checksum, or signature; the PowerShell example has the same trust problem. If the installer delivery infrastructure is compromised, attacker-controlled code could run with the agent process's permissions and access local files or credentials, although no malicious installer content is demonstrated here.

Content

Scanner excerpt · SKILL.md (reported line 63)May include surrounding context.

Fallback setup instructs execution of downloaded installer scripts without warning about the system-integrity implications.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

The fallback directs the agent to execute downloaded shell or PowerShell code without explaining that this can modify the local system or requiring user approval for installation. Restricting setup to a missing-CLI error reduces exposure, but an Ordinal read request can still unexpectedly become a local software installation.

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 84)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