rubeus_changepw · Rubeus MCP Server MCP: Risk & Policy

WHAT IT DOES

What rubeus_changepw does on Rubeus MCP Server

AI agents invoke rubeus_changepw 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_changepw needs a policy

This tool changes or resets a user's password via Kerberos abuse tooling (Rubeus/Impacket). Changing a password is a privileged write operation that can lock out legitimate users and is part of credential-based attack chains.

From the tool's definition Tool name 'rubeus_changepw' and description 'Change/reset a user' on a server described as 'A Model Context Protocol (MCP) server for Kerberos abuse operations using Rubeus'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rubeus_changepw Rate-limited

rubeus_changepw 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_changepw": {
      "limits": [
        {
          "counter": "rubeus_changepw_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_changepw

What does the rubeus_changepw tool do? +

Change/reset a user. 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_changepw? +

Register the Rubeus MCP Server MCP server in PolicyLayer and add a rule for rubeus_changepw: 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_changepw? +

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

Can I rate-limit rubeus_changepw? +

Yes. Add a rate_limit block to the rubeus_changepw 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_changepw completely? +

Set action: deny in the PolicyLayer policy for rubeus_changepw. 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_changepw? +

rubeus_changepw 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.