crack_hash

THE RISK

High Risk

Why crack_hash needs a policy

This tool runs hashcat, a powerful password cracking tool, as an external process. It is an Execute-category action because it triggers an external computation whose effects depend on arguments (hash type, attack mode, wordlists, masks, etc.). Severity is critical because an AI agent could misuse it to crack credentials at scale, enabling unauthorized access to accounts and systems.

From the tool's definition 'Crack a hash using hashcat with various attack modes' — directly executes hashcat, an external password-cracking program, with configurable attack modes

Documented attack patterns abuse exactly the kind of access crack_hash gives an agent:

POLICY

How to control crack_hash

PolicyLayer is an MCP gateway — it sits between your AI agents and Hashcat MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for crack_hash:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "crack_hash": {
      "limits": [
        {
          "counter": "crack_hash_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

crack_hash stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Hashcat MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Hashcat MCP Server tools

Execute auto_attack_strategy Automatically choose and execute best attack strategy Execute benchmark_hashcat Run hashcat benchmark for specified hash types or all types Execute crack_multiple_hashes Crack multiple hashes efficiently with auto-detection Execute create_wordlist_rules Generate wordlist variations using hashcat rules Execute generate_mask_attack Generate mask attack patterns for brute force Execute generate_smart_masks Generate intelligent mask patterns based on common password patterns Write create_session Create a new hashcat session for tracking Write save_attack_preset Save attack configuration as preset

All 23 Hashcat MCP Server tools →

Execute tools on other servers

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Go deeper

High-risk tools in Hashcat MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crack_hash

What does the crack_hash tool do? +

Crack a hash using hashcat with various attack modes. It is categorised as a Execute tool in the Hashcat MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on crack_hash? +

Register the Hashcat MCP Server MCP server in PolicyLayer and add a rule for crack_hash: 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 Hashcat MCP Server. Nothing to install.

What risk level is crack_hash? +

crack_hash is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit crack_hash? +

Yes. Add a rate_limit block to the crack_hash 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.

How do I block crack_hash completely? +

Set action: deny in the PolicyLayer policy for crack_hash. 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.

What MCP server provides crack_hash? +

crack_hash is provided by the Hashcat MCP Server MCP server (mordavid/hashcat-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Hashcat MCP Server tool call.

Start from Hashcat MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →