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Security audit

TOTP Authenticator

Security checks for vulnerabilities and agentic risk

Overview

A request for an authentication code can trigger an unverified software installer without a separate approval step.

Review and install the CLI separately before allowing this skill to use it, including its automatic skill installation behavior. Confirm that you trust OOMOL with the connected authentication account and generated codes. The remote installers could not be retrieved for inspection, and hosted credential handling is not included in the bundle; their exact behavior remains 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
99% confidence
Finding

The supplied code performs remote installer execution, not TOTP-related searching or reading. Nothing in the chunk establishes this installer as a supporting dependency for the declared functionality. The downloaded script's contents are unavailable, so its further effects cannot be determined.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
93% confidence
Finding

The supplied code consists solely of a login command, making authentication its visible primary behavior. Although authentication can support data access, this chunk provides no connection to a TOTP search or read workflow or to rfc-editor.org.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The curl-to-bash pipeline immediately executes mutable remote content without a pinned version or independent integrity verification. HTTPS protects transport but does not protect against a compromised publisher or distribution endpoint, which could deliver code that accesses local files and credentials; the PowerShell alternative has the same weakness.

Content

Scanner excerpt · SKILL.md (reported line 55)May include surrounding context.

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

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The fallback directs installation through immediate execution of downloaded scripts without requiring informed approval for local code execution or system changes. A missing CLI can therefore escalate a TOTP request into executing installer-controlled code with the invoking user's privileges; the credential-sensitive context increases the potential consequences.

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 76)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