#!/usr/bin/env python3

"""
Project: BRS-KB (BRS XSS Knowledge Base)
Company: EasyProTech LLC (www.easypro.tech)
Dev: Brabus
Date: 2025-12-26 UTC
Status: Created
Telegram: https://t.me/EasyProTech

Knowledge Base: WebGPU XSS
"""

DETAILS = {
    "title": "Cross-Site Scripting (XSS) via WebGPU API",
    "severity": "high",
    "cvss_score": 7.8,
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
    "reliability": "medium",
    "cwe": ["CWE-79", "CWE-922"],
    "owasp": ["A03:2021"],
    "tags": ["xss", "webgpu", "gpu", "compute", "shaders", "chrome-113"],
    "description": """
WebGPU API (Chrome 113+) provides low-level GPU access. XSS vulnerabilities occur when
user input is used in shader code, compute shader definitions, or GPU buffer contents
without proper sanitization.

SEVERITY: HIGH
Low-level GPU access can lead to shader injection, memory corruption, and arbitrary code execution.
""",
    "attack_vector": """
WEBGPU SHADER INJECTION:
const shaderCode = `
  @compute @workgroup_size(64)
  fn main() {
    ${userInput}  // XSS if userInput contains malicious WGSL
  }
`;
device.createComputePipeline({
  compute: { module: device.createShaderModule({ code: shaderCode }) }
});

WEBGPU BUFFER INJECTION:
const buffer = device.createBuffer({
  size: userInput.length,
  usage: GPUBufferUsage.STORAGE
});
device.queue.writeBuffer(buffer, 0, new Uint8Array(userInput));  // Memory corruption

WEBGPU TEXTURE DATA:
const texture = device.createTexture({
  size: [width, height],
  format: 'rgba8unorm'
});
device.queue.writeTexture(
  { texture },
  new Uint8Array(userInput),  // XSS if texture is read back
  { bytesPerRow: width * 4 }
);

WEBGPU PIPELINE INJECTION:
const pipeline = device.createRenderPipeline({
  vertex: {
    module: device.createShaderModule({ code: userInput }),  // XSS
    entryPoint: 'main'
  }
});
""",
    "remediation": """
DEFENSE:

1. Validate and sanitize all shader code
2. Validate buffer sizes and contents
3. Use whitelist for allowed shader operations
4. Implement CSP
5. Restrict WebGPU to trusted origins

SAFE PATTERN:
function validateShaderCode(code) {
  const allowedPatterns = [/^@compute/, /^@vertex/, /^@fragment/];
  if (!allowedPatterns.some(p => p.test(code))) {
    throw new Error('Invalid shader code');
  }
  // Additional validation
  return code;
}

BUFFER VALIDATION:
const maxBufferSize = 100 * 1024 * 1024;  // 100MB limit
if (userInput.length > maxBufferSize) {
  throw new Error('Buffer too large');
}

OWASP REFERENCES:
- CWE-79: Cross-site Scripting
- CWE-922: Insecure Storage
- WebGPU Specification
""",
}
