AI agents use pfsense_replace_services_bind_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.
This tool modifies DNS service access control lists, which affects firewall security posture and network access controls. While reversible (Write rather than Destructive), misuse could severely impact network accessibility and security by altering DNS service restrictions. High severity reflects the critical nature of DNS and firewall service configuration, though the action itself is not irreversible.
From the tool's definition Tool name contains 'replace' and description shows PUT method to '/api/v2/services/bind/access_lists', which modifies DNS BIND access control lists on a pfSense firewall. PUT operations create or overwrite data reversibly.
Attacks that exploit this kind of access
PUT /api/v2/services/bind/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.
Register the Pfsense MCP server in PolicyLayer and add a rule for pfsense_replace_services_bind_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.
pfsense_replace_services_bind_access_lists is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the pfsense_replace_services_bind_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.
Set action: deny in the PolicyLayer policy for pfsense_replace_services_bind_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.
pfsense_replace_services_bind_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.
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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