cme_smb · CrackMapExec MCP Server MCP: Risk & Policy

WHAT IT DOES

What cme_smb does on CrackMapExec MCP Server

AI agents invoke cme_smb to trigger actions in CrackMapExec 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 cme_smb needs a policy

While this tool technically spans multiple categories (Read for enumeration, Write for potential modifications, Destructive for credential extraction), the presence of "command execution" capability places it in the Execute category as the most severe applicable category.

From the tool's definition Tool explicitly supports "command execution" and "credential dumping (SAM, LSA, NTDS)" via SMB protocol through NetExec/CrackMapExec, which are penetration testing capabilities that can run arbitrary operations on network targets.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cme_smb Rate-limited

cme_smb 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": {
    "cme_smb": {
      "limits": [
        {
          "counter": "cme_smb_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 CrackMapExec MCP Server, so you can run agents against it safely.

FAQ

Questions about cme_smb

What does the cme_smb tool do? +

Execute SMB protocol operations with NetExec/CrackMapExec. Supports enumeration of shares, users, groups, sessions, credential dumping (SAM, LSA, NTDS), and command execution. It is categorised as a Execute tool in the CrackMapExec 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 cme_smb? +

Register the CrackMapExec MCP Server MCP server in PolicyLayer and add a rule for cme_smb: 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 CrackMapExec MCP Server. Nothing to install.

What risk level is cme_smb? +

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

Can I rate-limit cme_smb? +

Yes. Add a rate_limit block to the cme_smb 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 cme_smb completely? +

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

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