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Security audit

PhantomBuster

Security checks for vulnerabilities and agentic risk

Overview

The PhantomBuster workflow is coherent, but its automatic setup can execute unverified third-party code without a separate approval step.

Review the setup before enabling this skill. Prefer separately approving and verifying a specific oo release instead of allowing automatic script execution. Check its managed-skill synchronization settings, understand that PhantomBuster requests pass through OOMOL, and confirm launch or stop operations. The remote installers' exact system changes remain unverified.

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
98% confidence
Finding

The supplied code installs software from OOMOL and contains no PhantomBuster operations or evidence that this installer is a necessary supporting dependency. Remote script execution is therefore an undeclared capability in this context. The downloaded script's contents and further effects cannot be determined from the supplied chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a live HTTPS response directly into Bash executes remote code with the agent process's local privileges without version pinning or independent integrity verification. A compromised installer host or distribution pipeline could therefore access local files and credentials or modify the environment; HTTPS alone does not protect against a compromised publisher. This shares the installation path identified in SQP-2, and its reachability is reduced if the declared oo-only Bash restriction is enforced.

Content

Scanner excerpt · SKILL.md (reported line 61)May include surrounding context.

Fallback setup executes downloaded installer scripts without warning about local code execution or system changes.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The missing-CLI fallback directs the agent to download and execute an installer without explaining local system changes or requiring explicit installation approval. Installing a dependency crosses a different trust boundary from operating a connected PhantomBuster account, although the error-triggered fallback and declared Bash tool restriction reduce exposure.

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 82)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