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Security audit

IMAP Mailbox

Security checks for vulnerabilities and agentic risk

Overview

The mailbox controls are sensible, but setup can execute an unverified remote installer without first asking for approval.

Review before installing. You must trust OOMOL with the connected mailbox. Install a reviewed, verified CLI release yourself, review its automatic bundled-skill synchronization, and retain approval requirements for sending, modifying, or deleting email. Remote installer contents and hosted connector behavior remain unverified; the artifacts do not establish malicious intent.

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 only supplied command executes an external installation script; it does not connect to or manage an IMAP mailbox. Dependency installation could be a supporting implementation detail, but the supplied chunk establishes no connection between this installer and the declared mailbox functionality. The downloaded 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

Piping a mutable remote script directly into Bash executes its contents without an independent authenticity check or review. HTTPS protects transport but does not prevent a compromised publisher or distribution endpoint from serving malicious code, which would run with the agent's local privileges; the PowerShell example has the same risk.

Content

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

Fallback setup executes remotely downloaded scripts without warning the user about local code execution and system changes.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The fallback directs the agent to execute remotely supplied installation code without first obtaining approval for local code execution and system changes. Although triggered only when the CLI is missing, this expands a mailbox request into host-level software installation; malicious or compromised installer content could access local files and credentials with the agent'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 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