AI agents use create_ipsec_phase1_interface to create or update resources in Fortimanager — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fortimanager environment.
Creating IPsec Phase 1 interfaces is a reversible write operation that adds or configures cryptographic tunnel endpoints in a security appliance (FortiManager). While not destructive or financial, it has high severity due to potential to create unauthorized VPN tunnels, misconfigure network security, or enable unauthorized access paths if misused by an AI agent.
From the tool's definition Tool named 'create_ipsec_phase1_interface' indicates creation of a Phase 1 IPsec interface; this is a write operation that modifies network security configuration. Description is empty, limiting certainty.
Documented attack patterns abuse exactly the kind of access create_ipsec_phase1_interface gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Fortimanager, and nothing reaches the server without passing your rules. This is the rule we recommend for create_ipsec_phase1_interface:
{
"version": "1",
"default": "deny",
"tools": {
"create_ipsec_phase1_interface": {
"limits": [
{
"counter": "create_ipsec_phase1_interface_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_ipsec_phase1_interface 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.
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create_ipsec_phase1_interface. It is categorised as a Write tool in the Fortimanager MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Fortimanager MCP server in PolicyLayer and add a rule for create_ipsec_phase1_interface: 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 Fortimanager. Nothing to install.
create_ipsec_phase1_interface 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 create_ipsec_phase1_interface 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 create_ipsec_phase1_interface. 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.
create_ipsec_phase1_interface is provided by the Fortimanager MCP server (jmpijll/fortimanager-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Fortimanager, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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