AI agents call pfsense_list_services_haproxy_settings_dns_resolvers 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 HAProxy DNS resolver settings from a pfSense firewall. While categorically a Read operation (no data modification), the medium severity reflects that firewall configuration intelligence could inform subsequent attacks on network infrastructure. Confidence is reduced due to the empty description, though the sibling context and naming pattern provide strong categorical signals.
From the tool's definition Tool name contains 'list' and 'settings' prefix indicating data retrieval. The function name pattern 'pfsense_list_*' across sibling tools consistently performs read operations (e.g., listing firewall rules, aliases, NAT mappings).
Attacks that exploit this kind of access
pfsense_list_services_haproxy_settings_dns_resolvers. 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_haproxy_settings_dns_resolvers: 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_haproxy_settings_dns_resolvers 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_haproxy_settings_dns_resolvers 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_haproxy_settings_dns_resolvers. 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_haproxy_settings_dns_resolvers 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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