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Security audit

Simplesat

Security checks for vulnerabilities and agentic risk

Overview

Review before installing: setup can execute unverified remote code and introduce additional agent skills without clearly requesting approval.

Review and approve CLI installation separately, using a verified release. Consider setting OO_SKILLS_SYNC_DISABLED=1 before invoking the CLI to prevent the documented startup skill synchronization. Connect only the intended Simplesat account and review customer updates and survey emails before execution. The artifacts support setup and disclosure concerns, but do not establish malicious intent or data theft.

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 supplied command performs remote installer execution, with no visible Simplesat API operations or demonstrated relationship to the declared Simplesat functionality. Nothing in the supplied chunk establishes this installation as a supporting dependency. The downloaded script's further behavior cannot be determined from the provided code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a mutable remote installer directly into bash executes its contents without prior inspection, version pinning, or independent integrity verification. HTTPS protects transport but not against compromise of the distribution service, so this fallback introduces a supply-chain path to code execution with the agent's privileges; the PowerShell alternative has the same weakness.

Content

Scanner excerpt · SKILL.md (reported line 62)May include surrounding context.

The fallback setup executes downloaded installer scripts without a warning or user approval.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

When the CLI is missing, the fallback directs the agent to execute downloaded shell or PowerShell code without explicitly obtaining approval for local software installation. A Simplesat data request does not necessarily authorize arbitrary local code execution, and a compromised installer could access files and credentials with the agent's privileges; the conditional setup limits exposure but does not remove it.

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 83)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