AI agents call msf_session_list to retrieve information from Zebbern Kali MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about active Metasploit sessions without modifying state or triggering new operations. However, severity is elevated to 'high' because in the context of a penetration testing toolkit server, knowledge of active sessions could reveal sensitive attack infrastructure, active compromises, or command-and-control channels if an AI agent were to misuse this information to pivot attacks or…
From the tool's definition Tool name 'msf_session_list' and description 'List all active Metasploit sessions' indicate a query/retrieval operation with no side effects. The action is to enumerate existing sessions, not create, modify, delete, or execute code.
Documented attack patterns abuse exactly the kind of access msf_session_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Zebbern Kali MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for msf_session_list:
{
"version": "1",
"default": "deny",
"tools": {
"msf_session_list": {}
}
}msf_session_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all active Metasploit sessions. It is categorised as a Read tool in the Zebbern Kali MCP MCP Server, which means it retrieves data without modifying state.
Register the Zebbern Kali MCP server in PolicyLayer and add a rule for msf_session_list: 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 Zebbern Kali MCP. Nothing to install.
msf_session_list 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 msf_session_list 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 msf_session_list. 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.
msf_session_list is provided by the Zebbern Kali MCP server (zebbern/zebbern-kali-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 128 Zebbern Kali MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
128 Zebbern Kali MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.