AI agents call pfsense_list_services_dns_resolver_host_override_aliases to retrieve information from Pfsense without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/queries DNS resolver host override alias configurations. While the action itself is read-only, the severity is elevated to 'medium' rather than 'low' because the information retrieved could be sensitive network configuration data that could help an agent understand firewall architecture for reconnaissance or planning attacks.
From the tool's definition Tool name contains 'list' which retrieves data about DNS resolver host override aliases without modifying them. The pfSense context involves firewall and network configuration. Listing aliases is a query operation with no side effects.
Attacks that exploit this kind of access
pfsense_list_services_dns_resolver_host_override_aliases. It is categorised as a Read tool in the Pfsense MCP Server, which means it retrieves data without modifying state.
Register the Pfsense MCP server in PolicyLayer and add a rule for pfsense_list_services_dns_resolver_host_override_aliases: 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.
pfsense_list_services_dns_resolver_host_override_aliases is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the pfsense_list_services_dns_resolver_host_override_aliases 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.
Set action: deny in the PolicyLayer policy for pfsense_list_services_dns_resolver_host_override_aliases. 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.
pfsense_list_services_dns_resolver_host_override_aliases 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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