exploit_build_heap_spray
Generate heap spray payload for predictable heap layout. Supports V8 (ArrayBuffer), IE (BSTR), and generic (ArrayBuffer) spray targets. Returns spray code, allocation count, and predictability score.
This record as markdown: /tools/io-github-vmoranv-jshookmcp/exploit-build-heap-spray.md
What exploit_build_heap_spray does on Jshookmcp
AI agents invoke exploit_build_heap_spray to trigger actions in Jshookmcp. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why exploit_build_heap_spray is rated High
This tool generates exploit payloads specifically designed to manipulate heap memory layout for exploitation purposes (heap spray). It produces executable attack code targeting V8 and IE engines. Even though it 'generates' rather than directly executes, it produces ready-to-use exploit code for memory corruption attacks.
From the tool's definition Generate heap spray payload... Returns spray code, allocation count, and predictability score
Attacks that exploit this kind of access
The rule that runs exploit_build_heap_spray safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For exploit_build_heap_spray, this is the rule to start with:
exploit_build_heap_spray 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every exploit_build_heap_spray call is checked against it from then on.
Questions about exploit_build_heap_spray
Generate heap spray payload for predictable heap layout. Supports V8 (ArrayBuffer), IE (BSTR), and generic (ArrayBuffer) spray targets. Returns spray code, allocation count, and predictability score. It is categorised as a Execute tool in the Jshookmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Jshook MCP server in PolicyLayer and add a rule for exploit_build_heap_spray: 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 Jshookmcp. Nothing to install.
exploit_build_heap_spray is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the exploit_build_heap_spray 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 exploit_build_heap_spray. 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.
exploit_build_heap_spray is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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