rubeus_asreproast · Rubeus MCP Server MCP: Risk & Policy

WHAT IT DOES

What rubeus_asreproast does on Rubeus MCP Server

AI agents invoke rubeus_asreproast to trigger actions in Rubeus MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why rubeus_asreproast needs a policy

AS-REP Roasting is an offensive credential-harvesting attack against Active Directory. It actively queries the KDC for AS-REP responses containing encrypted hashes that can be cracked offline to recover plaintext passwords.

From the tool's definition 'Perform AS-REP Roasting against accounts' - AS-REP Roasting is an active Kerberos attack technique that harvests encrypted credential material from Active Directory accounts that don't require pre-authentication, part of a server explicitly designed for…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rubeus_asreproast Rate-limited

rubeus_asreproast stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "rubeus_asreproast": {
      "limits": [
        {
          "counter": "rubeus_asreproast_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Rubeus MCP Server, so you can run agents against it safely.

FAQ

Questions about rubeus_asreproast

What does the rubeus_asreproast tool do? +

Perform AS-REP Roasting against accounts that don. It is categorised as a Execute tool in the Rubeus MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on rubeus_asreproast? +

Register the Rubeus MCP Server MCP server in PolicyLayer and add a rule for rubeus_asreproast: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Rubeus MCP Server. Nothing to install.

What risk level is rubeus_asreproast? +

rubeus_asreproast is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit rubeus_asreproast? +

Yes. Add a rate_limit block to the rubeus_asreproast rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block rubeus_asreproast completely? +

Set action: deny in the PolicyLayer policy for rubeus_asreproast. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides rubeus_asreproast? +

rubeus_asreproast is provided by the Rubeus MCP Server MCP server (schwarztim/sec-rubeus-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.