Parse and display detailed information about a Kerberos ticket. Can decrypt ticket contents if the appropriate key is provided. Useful for analyzing captured tickets.
AI agents call rubeus_describe 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.
This tool performs analysis and parsing of Kerberos ticket data. While the server context involves Kerberos abuse operations, this particular tool only reads and decrypts ticket contents for analysis purposes. It has no side effects, does not modify tickets, does not execute commands, and does not move data or perform destructive operations. The decryption capability is passive analysis, not a system-level action.
From the tool's definition 'Parse and display detailed information about a Kerberos ticket' and 'analyzing captured tickets' — the tool retrieves and displays data about existing tickets without modifying or executing operations.
Attacks that exploit this kind of access
Parse and display detailed information about a Kerberos ticket. Can decrypt ticket contents if the appropriate key is provided. Useful for analyzing captured tickets. 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_describe: 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_describe 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_describe 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_describe. 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_describe 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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