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Security audit

Moxie

Security checks for vulnerabilities and agentic risk

Overview

The Moxie reading features fit their purpose, but automatic setup runs an unverified remote installer without a separate approval step.

Require approval before setup and review a pinned CLI release before installing it. Check whether its installation of additional agent skills is acceptable, and connect only the intended Moxie account through OOMOL. The Review verdict concerns automatic setup and persistent effects; the artifact does not establish malicious intent. Remote installer and hosted connector implementations remain 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 (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command executes an Oomol-hosted installer rather than searching or reading Moxie data. Nothing in the supplied chunk establishes this installation as a supporting dependency for the declared purpose. The downloaded script's contents are not provided, so its further effects cannot be determined.

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 with the agent process's privileges, without integrity verification or review; the PowerShell alternative has the same weakness. Compromise of the distribution endpoint could therefore lead to local code execution and access to files or credentials available to that process, although the missing-CLI condition limits when this path is reached.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

Fallback setup executes remote installation scripts without warning the user about system changes.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The fallback instructs the agent to install software after a missing-command error without first obtaining approval for local system changes. A request to read Moxie data does not inherently authorize installing executable software; the conditional trigger reduces exposure but does not establish consent.

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 81)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