List detailed information about Kerberos tickets. Similar to the native klist command but with more detail and filtering options.
AI agents call rubeus_klist to retrieve information from Rubeus MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
While this is fundamentally a Read operation (listing/querying Kerberos ticket data), the severity is elevated to medium rather than low because: (1) this tool is part of a Kerberos abuse toolkit (Rubeus/Impacket) designed for malicious operations, (2) gathering detailed ticket information is often a reconnaissance step for privilege escalation or lateral movement attacks, and (3) an attacker could use this to…
From the tool's definition Tool description states it 'List[s] detailed information about Kerberos tickets' similar to the native klist command, which is a read-only operation that queries and retrieves ticket information without modification.
Attacks that exploit this kind of access
List detailed information about Kerberos tickets. Similar to the native klist command but with more detail and filtering options. It is categorised as a Read tool in the Rubeus MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Rubeus MCP Server MCP server in PolicyLayer and add a rule for rubeus_klist: 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 Rubeus MCP Server. Nothing to install.
rubeus_klist 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 rubeus_klist 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 rubeus_klist. 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.
rubeus_klist is provided by the Rubeus MCP Server MCP server (schwarztim/sec-rubeus-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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