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Security audit

Felt

Security checks for vulnerabilities and agentic risk

Overview

Felt operations have clear approval controls, but setup can execute unverified remote code and introduce broader agent changes without separate user approval.

Review and approve CLI installation separately before enabling this skill. OOMOL will mediate Felt access, and its CLI may also install other agent skills. The publisher documents OO_SKILLS_SYNC_DISABLED=1 to disable startup skill synchronization in its [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md). The remote installers and hosted implementation remain unverified. Keep the skill's approval requirements for Felt writes and deletions.

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 performs remote software installation rather than any demonstrated Felt operation. Although dependency installation can be a supporting implementation detail, the supplied content establishes no relationship between this Oomol installer and the declared Felt functionality. The downloaded script's further behavior is not visible and cannot be assessed.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The command executes a mutable remote script directly in Bash without a pinned version or independent integrity verification; the PowerShell alternative has the same underlying risk. Compromise of the distribution endpoint or release pipeline could execute attacker-controlled code with the invoking user's permissions, exposing local files and credentials despite server-side handling of Felt tokens.

Content

Scanner excerpt · SKILL.md (reported line 66)May include surrounding context.

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

Medium
Category
Output Handling
Confidence
92% confidence
Finding

When the CLI is missing, the skill directs installation without requiring informed approval for executing remote code or changing the local environment. The Felt write/destructive confirmation rules do not cover local software installation, so a routine Felt request could unexpectedly trigger broader system 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 87)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