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Security audit

Daffy

Security checks for vulnerabilities and agentic risk

Overview

This Daffy reader needs review because its setup directs the agent to execute unverified downloaded code without a clear user checkpoint.

Install a reviewed, pinned CLI separately before using this skill. Review OOMOL's access to Daffy financial information and its automatic agent-skill synchronization; the [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md) documents OO_SKILLS_SYNC_DISABLED. The remote installer and hosted connector implementations 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 (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
96% confidence
Finding

The supplied chunk performs an external installation step rather than any visible Daffy data operation. No evidence establishes this installer as a necessary supporting implementation detail for Daffy access. The downloaded script's contents are not supplied, so its further actions cannot be determined.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
86% confidence
Finding

The supplied code only initiates login; it contains no Daffy search or read operation and establishes no connection between oo and Daffy. Authentication could be a supporting implementation detail if that connection were shown, but the supplied chunk instead presents authentication as its sole behavior.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping an unpinned HTTPS response directly into Bash executes whatever code the installer endpoint supplies, without an integrity check or review opportunity. A compromised distribution endpoint could therefore execute arbitrary commands with the agent process's local privileges; the PowerShell alternative has the same underlying risk.

Content

Scanner excerpt · SKILL.md (reported line 64)May include surrounding context.

The setup workflow executes remotely downloaded installer scripts without warning the user about the trust and system-modification implications.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The missing-CLI fallback directs the agent to execute remotely supplied installation code without explicitly obtaining approval for local system changes. Although installation is relevant to the connector and conditional on a missing dependency, it crosses from reading Daffy data into executing code with the local user's privileges.

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 85)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