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Security audit

PRTG Classic

Security checks for vulnerabilities and agentic risk

Overview

The PRTG read workflow fits its purpose, but fallback setup executes unverified remote code without a clear approval step.

Review setup before installing. Install a reviewed, verified CLI release yourself and require approval for further installation or agent-skill changes. Use a read-only PRTG connection and consider OOMOL's access to monitoring data. The bundled instructions were fully inspected; the external installer and connector implementations remain unverified. No malicious behavior was established.

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 an external installer operation rather than searching or reading PRTG Classic data. Nothing in the chunk establishes that this installer supports the declared functionality. The downloaded script's contents are not provided, so its additional effects cannot be assessed.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

Piping a mutable remote script directly into bash executes its contents without an independent integrity check or review; the PowerShell alternative has the same weakness. HTTPS and the relevant vendor domain reduce some interception risk, but a compromised distribution endpoint could still supply code that accesses local files or credentials with the user's privileges.

Content

Scanner excerpt · SKILL.md (reported line 56)May include surrounding context.

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

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The fallback tells the agent to install software by executing downloaded scripts without first explaining the system changes or obtaining explicit installation approval. Although conditional and relevant to the task, this crosses from reading PRTG data into local code execution with the invoking user's privileges.

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 77)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