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Security audit

Nusii Proposals

Security checks for vulnerabilities and agentic risk

Overview

The Nusii workflow requires approval for account changes, but its setup fallback directs the agent to run an unverified remote installer without separate user approval.

Review the installation fallback before enabling this skill. Prefer a verified CLI release installed under your control, and require approval before either downloaded installer executes. OOMOL will mediate access to your Nusii data; check proposal changes and recipients when approving actions. The complete bundled skill was inspected, but remote installer and hosted connector behavior remain outside this review.

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 supplied code performs remote software installation rather than the declared Nusii Proposals management. Although installing dependencies can be a supporting implementation detail, no connection between this installer and Nusii functionality is established here. The downloaded script's contents and additional 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

Piping a live remote script directly into Bash executes whatever the endpoint supplies with the invoking user's privileges, without version pinning or independent integrity verification. The URL belongs to the documented CLI provider and setup is conditional, which reduces suspicion of malicious intent but does not prevent host compromise if the distribution endpoint or installer is compromised; the PowerShell example has the same weakness.

Content

Scanner excerpt · SKILL.md (reported line 68)May include surrounding context.

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

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The fallback directs an agent to execute remote installation scripts without explicitly obtaining approval for local code execution and system changes. Although installation is conditional on the CLI being absent, the write-confirmation rules cover Nusii state rather than host changes, leaving a separate authorization gap if the setup commands are permitted.

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 89)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