nxc_shares · Sec Netexec MCP: Risk & Policy

WHAT IT DOES

What nxc_shares does on Sec Netexec

AI agents invoke nxc_shares to trigger actions in Sec Netexec. 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 nxc_shares needs a policy

While enumeration alone would be Read, the explicit mention of 'interact with SMB shares' indicates the tool performs write or execution-class operations on remote systems. In the context of a penetration testing tool (NetExec), SMB share interaction typically includes mount operations, file access, authentication attempts, and potentially file manipulation.

From the tool's definition Tool description states 'Enumerate and interact with SMB shares on target systems' — 'interact' indicates active operations beyond passive enumeration.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

nxc_shares Rate-limited

nxc_shares 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": {
    "nxc_shares": {
      "limits": [
        {
          "counter": "nxc_shares_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 Sec Netexec, so you can run agents against it safely.

FAQ

Questions about nxc_shares

What does the nxc_shares tool do? +

Enumerate and interact with SMB shares on target systems. It is categorised as a Execute tool in the Sec Netexec MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on nxc_shares? +

Register the Sec Netexec MCP server in PolicyLayer and add a rule for nxc_shares: 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 Sec Netexec. Nothing to install.

What risk level is nxc_shares? +

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

Can I rate-limit nxc_shares? +

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

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

nxc_shares is provided by the Sec Netexec MCP server (schwarztim/sec-netexec-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.