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Security audit

Firstbase

Security checks for vulnerabilities and agentic risk

Overview

The Firstbase features fit the stated purpose, but setup and the linked CLI can make broader local changes that the skill does not explain.

Review and install a verified CLI release yourself before allowing this skill to run. Consider setting OO_SKILLS_SYNC_DISABLED=1 before invoking it to prevent automatic changes to agent skill directories. Connect only the intended Firstbase account with read access, and understand that OOMOL intermediates requests. The review concerns installation control and under-disclosed persistent changes; 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 performs no visible Firstbase search or read operation. Instead, it fetches and executes an external installer. Nothing in the supplied content establishes this installation as a supporting implementation detail for Firstbase access. The fetched script's further behavior 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

The command pipes a remotely fetched, mutable script directly into Bash without version pinning or independent integrity verification. Compromise of the installer hosting or delivery infrastructure could therefore yield code execution with the agent's local privileges; HTTPS and a relevant vendor domain do not eliminate that supply-chain risk.

Content

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

The setup workflow executes remote installation scripts without warning about local system changes or requesting approval.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

A missing CLI triggers instructions to execute a downloaded installer without first obtaining approval for local software installation. Both the shell and PowerShell variants can execute arbitrary code with the invoking user's privileges; the missing-dependency condition limits exposure but does not establish user authorization for those changes.

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