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Security audit

GitHub

Security checks for vulnerabilities and agentic risk

Overview

The GitHub workflow includes approval safeguards, but its setup fallback runs downloaded code without clearly requiring permission for local changes.

Review and install a verified CLI release yourself, and require approval before any setup changes. Check its automatic skill synchronization settings and grant only the GitHub permissions you need. GitHub changes already require confirmation. The full bundled skill was inspected, but downloaded installer contents and hosted-service behavior remain unverified; 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
99% confidence
Finding

The supplied command executes an installer from cli.oomol.com rather than performing a GitHub operation. Nothing in the supplied chunk establishes this installer as a supporting dependency for GitHub functionality. The remote script's contents and any further effects cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a remotely fetched script directly into Bash executes mutable network content with the agent process's local privileges, without prior inspection or integrity verification. Compromise of the installer distribution could expose local files and credentials or modify the host; the PowerShell example has the same weakness, although neither example proves malicious intent.

Content

Scanner excerpt · SKILL.md (reported line 201)May include surrounding context.

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

Medium
Category
Output Handling
Confidence
95% confidence
Finding

The missing-CLI fallback directs the agent to execute an installer without explicitly obtaining approval for local code execution or system changes. Although limited to first-time setup, it crosses from GitHub operations into modifying the host, and the GitHub action confirmation rules do not clearly cover this step.

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 222)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