pfsense_replace_services_dns_resolver_access_lists

PUT /api/v2/services/dns_resolver/access_lists

SERVERPfsense SOURCEabl030/pfsense-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/abl030-pfsense-mcp/pfsense-replace-services-dns-resolver-access-lists.md

WHAT IT DOES

What pfsense_replace_services_dns_resolver_access_lists does on Pfsense

AI agents use pfsense_replace_services_dns_resolver_access_lists to create or update resources in Pfsense, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Pfsense environment.

RISK

Why pfsense_replace_services_dns_resolver_access_lists is rated Medium

This tool modifies firewall DNS resolver access control configuration, which affects security policy and network behavior. PUT operations create or update resources, making this a Write category tool. The severity is high because misconfigured DNS access lists can disrupt network services, create security vulnerabilities, or expose DNS queries.

From the tool's definition Tool name contains 'replace' and description shows PUT /api/v2/services/dns_resolver/access_lists, which is an HTTP PUT method used to modify DNS resolver access lists on a pfSense firewall.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pfsense_replace_services_dns_resolver_access_lists safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Pfsense, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pfsense_replace_services_dns_resolver_access_lists, this is the rule to start with:

pfsense_replace_services_dns_resolver_access_lists Rate-limited

pfsense_replace_services_dns_resolver_access_lists stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pfsense_replace_services_dns_resolver_access_lists": {
      "limits": [
        {
          "counter": "pfsense_replace_services_dns_resolver_access_lists_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Pfsense, apply this rule, and every pfsense_replace_services_dns_resolver_access_lists call is checked against it from then on.

FAQ

Questions about pfsense_replace_services_dns_resolver_access_lists

What does the pfsense_replace_services_dns_resolver_access_lists tool do? +

PUT /api/v2/services/dns_resolver/access_lists. It is categorised as a Write tool in the Pfsense MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pfsense_replace_services_dns_resolver_access_lists? +

Register the Pfsense MCP server in PolicyLayer and add a rule for pfsense_replace_services_dns_resolver_access_lists: 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 Pfsense. Nothing to install.

What risk level is pfsense_replace_services_dns_resolver_access_lists? +

pfsense_replace_services_dns_resolver_access_lists is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pfsense_replace_services_dns_resolver_access_lists? +

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

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

pfsense_replace_services_dns_resolver_access_lists is provided by the Pfsense MCP server (abl030/pfsense-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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