Fileupload Gunner Project [TOP | 2026]

: Change filenames to randomly generated strings upon upload to prevent direct execution. Validate by Content

Alex typed the command: ./gunner --target secure-vault.io --mode aggressive .

To bypass server limits and improve user experience, implement chunked file uploads. The frontend can use libraries like webuploader to split files, while the backend (e.g., SpringBoot) receives each shard, stores it temporarily with a unique identifier (UUID), and reassembles the chunks upon completion.

Dynamic sizing based on network speed (e.g., 2MB for 3G, 10MB for Fiber). Balances overhead vs. transfer stability. Enforce HTTP/2 or HTTP/3 (QUIC).

[ Client UI ] ---> ( Chunked Stream ) ---> [ Gunner Ingestion Gateway ] ---> [ S3 / Cloud Bucket ] | ( MIME & Magic Byte Check ) | [ Security Interceptor ] fileupload gunner project

Let's say you have a test target: http://testapp.com/upload expecting a field named avatar . A basic command looks like this:

The "Gunner" moniker stems from its aggressive, high-velocity upload strategy. Rather than sending chunks sequentially, the system utilizes a customizable concurrency pool. If the concurrency factor is set to 4, the client will fire 4 parallel asynchronous HTTP requests simultaneously. This maximizes the utilization of the user's network bandwidth. State Management and Database Synchronization

: Keeps file systems physically separate from web servers to block remote code execution attacks.

By analyzing the Gunner project’s log files, security engineers create tailored ModSecurity or Coraza rules: : Change filenames to randomly generated strings upon

: Attempts to access the uploaded file via a direct URL or an inclusion vulnerability to trigger the embedded web shell. 3. Key Features & Modules Description Payload Generator

Contributions are welcome! Please read the CONTRIBUTING.md file for guidelines on how to submit pull requests.

The original filename (e.g., invoice.pdf ) is replaced with a cryptographically secure UUID ( 9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d ). This prevents directory traversal attacks and filename collisions. Step-by-Step Implementation Blueprint

Do not store file binaries directly in SQL databases (BLOBs). Store only the metadata strings and URLs. The frontend can use libraries like webuploader to

Breaking large files into smaller, manageable pieces.

const express = require('express'); const crypto = require('crypto'); const path = require('path'); const fs = require('fs'); const app = express(); app.use(express.json()); // Strict configuration constraints const ALLOWED_EXTENSIONS = ['.jpg', '.jpeg', '.png', '.pdf']; const MAX_FILE_SIZE = 50 * 1024 * 1024; // 50 Megabytes Maximum app.post('/api/upload/gunner-chunk', (req, res) => const chunkIndex, totalChunks, originalName, targetUuid = req.body; const chunkData = req.files?.chunk; if (!chunkData) return res.status(400).json( error: 'No data chunk received.' ); // 1. Initial Extension Verification const fileExtension = path.extname(originalName).toLowerCase(); if (!ALLOWED_EXTENSIONS.includes(fileExtension)) return res.status(400).json( error: 'Prohibited file extension type.' ); // 2. Directory Isolation and Path Assembly const tempDirectory = path.join(__dirname, 'secure_vault', 'chunks', targetUuid); if (!fs.existsSync(tempDirectory)) fs.mkdirSync(tempDirectory, recursive: true ); const chunkPath = path.join(tempDirectory, `$chunkIndex.part`); // 3. Persist Chunk to Isolated Ingestion Directory chunkData.mv(chunkPath, (err) => if (err) return res.status(500).json( error: 'Chunk storage failure.' ); // If all pieces arrived, trigger the stitching process if (parseInt(chunkIndex) === parseInt(totalChunks) - 1) stitchFileChunks(targetUuid, originalName, totalChunks, res); else res.status(200).json( status: 'Chunk received successfully.' ); ); ); function stitchFileChunks(uuid, originalName, totalChunks, res) const ext = path.extname(originalName).toLowerCase(); const randomizedName = `$crypto.randomUUID()$ext`; const finalDestination = path.join(__dirname, 'secure_vault', 'completed', randomizedName); const writeStream = fs.createWriteStream(finalDestination); for (let i = 0; i < totalChunks; i++) const chunkPath = path.join(__dirname, 'secure_vault', 'chunks', uuid, `$i.part`); const chunkBuffer = fs.readFileSync(chunkPath); writeStream.write(chunkBuffer); fs.unlinkSync(chunkPath); // Clean up immediately after stitching writeStream.end(); fs.rmdirSync(path.join(__dirname, 'secure_vault', 'chunks', uuid)); return res.status(201).json( message: 'File fully assembled and stored securely.', resourceId: randomizedName ); Use code with caution. 🚀 Performance Optimization Strategies

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Once the final chunk arrives, assembling the file can be CPU and I/O intensive. Gunner decouples this step from the synchronous HTTP request-response cycle. The ingestion worker fires a "Verification and Assembly" event to a message broker (like RabbitMQ or Redis Pub/Sub). A background worker thread reads the chunks in sequence, merges them into the final file, validates the total file checksum, and clears the temporary staging area. 3. Security Considerations in High-Volume Uploading