Back to skill

Security audit

L2S

Security checks for vulnerabilities and agentic risk

Overview

The L2S actions have clear safeguards, but setup executes unverified downloaded code and leaves broader changes to agent skills undisclosed.

Review and approve dependency installation separately, preferably using a pinned release with verified integrity. Expect L2S data to pass through OOMOL. Before invoking the CLI, review its automatic skill synchronization; current documentation provides OO_SKILLS_SYNC_DISABLED=1 to disable startup skill writes. The live installers were unavailable for inspection, so their exact system changes remain uncertain.

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 visible behavior installs software from Oomol rather than accessing L2S. Nothing in the supplied description or code establishes this installer as a supporting dependency for L2S, so it represents an undeclared capability and inconsistent resource access. The downloaded script's contents and further effects cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command downloads a mutable remote script and immediately executes it without inspection, version pinning, or independent integrity verification; the PowerShell alternative follows the same pattern. If the distribution endpoint or release pipeline is compromised, attacker-controlled code could run with the invoking user's privileges and access local data or credentials. The legitimate dependency context and HTTPS reduce suspicion of malicious intent but do not eliminate this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 57)May include surrounding context.

First-time setup executes downloaded installer scripts without warning about local code execution and system changes.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The setup instructions direct the agent to install software after a command-not-found error without requiring approval for local code execution or explaining potential system changes. Restricting installation to first-time setup reduces exposure, but the write-confirmation rules only cover L2S actions and do not explicitly protect this local installation step.

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 78)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