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Security audit

ReferralHero

Security checks for vulnerabilities and agentic risk

Overview

ReferralHero operations have clear safeguards, but setup can execute downloaded installation code without separate user approval.

Review and approve CLI installation separately before allowing this skill to perform setup. Prefer a pinned, independently verified installation and review any bundled agent skills it installs. OOMOL mediates access to your ReferralHero account, so use appropriately limited permissions and retain the required write/delete confirmations. The Review verdict concerns setup control; the artifact does not establish malicious behavior.

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 chunk contains no ReferralHero operations or evidence connecting the Oomol installer to the declared purpose. Although installation can be a supporting implementation detail, this chunk only downloads and executes an unrelated service's installer. The downloaded script's contents and any further effects cannot be determined from the supplied code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping an HTTPS response directly into bash executes mutable remote code with the invoking user's permissions, without a pinned version or independent integrity verification. Compromise of the installer distribution could therefore expose local files and credentials or enable persistence; its legitimate setup purpose and missing-CLI condition reduce exposure but do not eliminate this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 65)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning the user about remote code execution or system changes.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The fallback instructs the agent to execute downloaded installation scripts without explaining their system-level effects or obtaining installation-specific approval. Although triggered only when the CLI is absent, this expands a ReferralHero data task into local software installation, outside the skill's explicit confirmation requirements for ReferralHero writes and deletions.

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 86)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