根据 统一身份认证用户 cas_name 查找 coremail 用户
AI agents call getUserFromCasName to retrieve information from MCP-YNU FastMCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves user information from a directory or database by cas_name (a corporate identity attribute). It is a read-only query operation. Severity is medium rather than low because it accesses user identity/credential data which could enable social engineering or targeted attacks if misused; however, it only reads and does not modify systems or commit financial/destructive actions.
From the tool's definition Tool name is getUserFromCasName; description states it 'queries/searches for coremail user based on unified identity authentication cas_name', which is a lookup/retrieval operation with no modification or deletion.
Attacks that exploit this kind of access
根据 统一身份认证用户 cas_name 查找 coremail 用户. It is categorised as a Read tool in the MCP-YNU FastMCP Server MCP Server, which means it retrieves data without modifying state.
Register the MCP-YNU FastMCP Server MCP server in PolicyLayer and add a rule for getUserFromCasName: 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 MCP-YNU FastMCP Server. Nothing to install.
getUserFromCasName 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 getUserFromCasName 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 getUserFromCasName. 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.
getUserFromCasName is provided by the MCP-YNU FastMCP Server MCP server (ynu/mcp-ynu). 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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