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Security audit

FullContact

Security checks for vulnerabilities and agentic risk

Overview

The FullContact workflow is coherent, but its automatic setup executes unverified remote code without a clear user approval step.

Review setup before enabling this skill. Install a reviewed, version-pinned CLI separately and decide whether to allow its agent-skill synchronization. Only submit personal identifiers you intend OOMOL and FullContact to process. The bundled file shows no malicious payload, but the external installer and hosted connector implementations were not verified.

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 code performs remote installer execution, not FullContact searching or data retrieval. Nothing in the chunk establishes that this installation supports the declared FullContact functionality, so it cannot be treated as a demonstrated supporting implementation detail. The downloaded script's further behavior is not visible.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup instructions pipe a mutable remote script directly into Bash without a pinned version, independently verified integrity, or review; the PowerShell alternative has the same weakness. Compromise of the distribution endpoint could execute attacker-controlled code with the agent's local privileges and expose accessible files or credentials. The missing-CLI prerequisite limits when this occurs, and the declared oo-only Bash permission does not authorize the installer, but neither makes the installation guidance safe.

Content

Scanner excerpt · SKILL.md (reported line 59)May include surrounding context.

The workflow permits sending personal identifiers to third-party services without a privacy warning.

Medium
Category
Output Handling
Confidence
88% confidence
Finding

The workflow instructs the agent to execute connector actions and declares all untagged actions safe to run directly. Person-enrichment and verification requests transmit personal identifiers through OOMOL to FullContact, but the safety section addresses only state changes and does not warn about this disclosure of personal data.

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 80)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