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Security audit

Bouncer

Security checks for vulnerabilities and agentic risk

Overview

The Bouncer workflow has sensible safeguards, but automatic setup executes unpinned remote code and leaves broader changes to agent skills undisclosed.

Review the CLI installation separately and use a reviewed release. Before running it, consider disabling startup skill synchronization with OO_SKILLS_SYNC_DISABLED=1, as documented in the [CLI controls](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md#environment-variables). Only submit email addresses you are authorized to share with OOMOL and Bouncer. The bundled artifact shows no malicious behavior; the remaining concerns are automatic installation and undisclosed persistent changes, whose exact implementation was not inspected.

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
96% confidence
Finding

The only visible behavior is executing an installer from a different service, rather than interacting with Bouncer. Although dependency installation can be a supporting implementation detail, the supplied chunk provides no evidence that this installer supports Bouncer functionality. The remote script's contents and any further effects are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup command immediately executes remotely fetched shell code without a pinned version or independent integrity verification; the PowerShell alternative has the same weakness. A compromised distribution endpoint or malicious installer update could execute arbitrary commands with the agent's local privileges, exposing files and credentials or modifying the environment. Restricting setup to a missing CLI reduces exposure frequency but does not make the execution safe.

Content

Scanner excerpt · SKILL.md (reported line 67)May include surrounding context.

The execution workflow lacks a privacy warning that email-verification payloads are transmitted through OOMOL to Bouncer.

Medium
Category
Output Handling
Confidence
90% confidence
Finding

The workflow instructs the agent to submit action payloads through the connector, including email addresses for verification. Although the skill identifies the services involved, it does not warn that user-provided email addresses will be shared with them, and its safety section labels untagged verification actions as safe to run directly.

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 88)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