前端攻击（JavaScript Attacks）

这是一种比较新颖的玩法，通过捕获js中的漏洞进行，成功提交success就算赢

Security Level: low

源码

<?php
$page[ 'body' ] .= <<<EOF
<script>/*
MD5 code from here
https://github.com/blueimp/JavaScript-MD5
*/!function(n){"use strict";function t(n,t){var r=(65535&n)+(65535&t);return(n>>16)+(t>>16)+(r>>16)<<16|65535&r}function r(n,t){return n<<t|n>>>32-t}function e(n,e,o,u,c,f){return t(r(t(t(e,n),t(u,f)),c),o)}function o(n,t,r,o,u,c,f){return e(t&r|~t&o,n,t,u,c,f)}function u(n,t,r,o,u,c,f){return e(t&o|r&~o,n,t,u,c,f)}function c(n,t,r,o,u,c,f){return e(t^r^o,n,t,u,c,f)}function f(n,t,r,o,u,c,f){return e(r^(t|~o),n,t,u,c,f)}function i(n,r){n[r>>5]|=128<<r%32,n[14+(r+64>>>9<<4)]=r;var e,i,a,d,h,l=1732584193,g=-271733879,v=-1732584194,m=271733878;for(e=0;e<n.length;e+=16)i=l,a=g,d=v,h=m,g=f(g=f(g=f(g=f(g=c(g=c(g=c(g=c(g=u(g=u(g=u(g=u(g=o(g=o(g=o(g=o(g,v=o(v,m=o(m,l=o(l,g,v,m,n[e],7,-680876936),g,v,n[e+1],12,-389564586),l,g,n[e+2],17,606105819),m,l,n[e+3],22,-1044525330),v=o(v,m=o(m,l=o(l,g,v,m,n[e+4],7,-176418897),g,v,n[e+5],12,1200080426),l,g,n[e+6],17,-1473231341),m,l,n[e+7],22,-45705983),v=o(v,m=o(m,l=o(l,g,v,m,n[e+8],7,1770035416),g,v,n[e+9],12,-1958414417),l,g,n[e+10],17,-42063),m,l,n[e+11],22,-1990404162),v=o(v,m=o(m,l=o(l,g,v,m,n[e+12],7,1804603682),g,v,n[e+13],12,-40341101),l,g,n[e+14],17,-1502002290),m,l,n[e+15],22,1236535329),v=u(v,m=u(m,l=u(l,g,v,m,n[e+1],5,-165796510),g,v,n[e+6],9,-1069501632),l,g,n[e+11],14,643717713),m,l,n[e],20,-373897302),v=u(v,m=u(m,l=u(l,g,v,m,n[e+5],5,-701558691),g,v,n[e+10],9,38016083),l,g,n[e+15],14,-660478335),m,l,n[e+4],20,-405537848),v=u(v,m=u(m,l=u(l,g,v,m,n[e+9],5,568446438),g,v,n[e+14],9,-1019803690),l,g,n[e+3],14,-187363961),m,l,n[e+8],20,1163531501),v=u(v,m=u(m,l=u(l,g,v,m,n[e+13],5,-1444681467),g,v,n[e+2],9,-51403784),l,g,n[e+7],14,1735328473),m,l,n[e+12],20,-1926607734),v=c(v,m=c(m,l=c(l,g,v,m,n[e+5],4,-378558),g,v,n[e+8],11,-2022574463),l,g,n[e+11],16,1839030562),m,l,n[e+14],23,-35309556),v=c(v,m=c(m,l=c(l,g,v,m,n[e+1],4,-1530992060),g,v,n[e+4],11,1272893353),l,g,n[e+7],16,-155497632),m,l,n[e+10],23,-1094730640),v=c(v,m=c(m,l=c(l,g,v,m,n[e+13],4,681279174),g,v,n[e],11,-358537222),l,g,n[e+3],16,-722521979),m,l,n[e+6],23,76029189),v=c(v,m=c(m,l=c(l,g,v,m,n[e+9],4,-640364487),g,v,n[e+12],11,-421815835),l,g,n[e+15],16,530742520),m,l,n[e+2],23,-995338651),v=f(v,m=f(m,l=f(l,g,v,m,n[e],6,-198630844),g,v,n[e+7],10,1126891415),l,g,n[e+14],15,-1416354905),m,l,n[e+5],21,-57434055),v=f(v,m=f(m,l=f(l,g,v,m,n[e+12],6,1700485571),g,v,n[e+3],10,-1894986606),l,g,n[e+10],15,-1051523),m,l,n[e+1],21,-2054922799),v=f(v,m=f(m,l=f(l,g,v,m,n[e+8],6,1873313359),g,v,n[e+15],10,-30611744),l,g,n[e+6],15,-1560198380),m,l,n[e+13],21,1309151649),v=f(v,m=f(m,l=f(l,g,v,m,n[e+4],6,-145523070),g,v,n[e+11],10,-1120210379),l,g,n[e+2],15,718787259),m,l,n[e+9],21,-343485551),l=t(l,i),g=t(g,a),v=t(v,d),m=t(m,h);return[l,g,v,m]}function a(n){var t,r="",e=32*n.length;for(t=0;t<e;t+=8)r+=String.fromCharCode(n[t>>5]>>>t%32&255);return r}function d(n){var t,r=[];for(r[(n.length>>2)-1]=void 0,t=0;t<r.length;t+=1)r[t]=0;var e=8*n.length;for(t=0;t<e;t+=8)r[t>>5]|=(255&n.charCodeAt(t/8))<<t%32;return r}function h(n){return a(i(d(n),8*n.length))}function l(n,t){var r,e,o=d(n),u=[],c=[];for(u[15]=c[15]=void 0,o.length>16&&(o=i(o,8*n.length)),r=0;r<16;r+=1)u[r]=909522486^o[r],c[r]=1549556828^o[r];return e=i(u.concat(d(t)),512+8*t.length),a(i(c.concat(e),640))}function g(n){var t,r,e="";for(r=0;r<n.length;r+=1)t=n.charCodeAt(r),e+="0123456789abcdef".charAt(t>>>4&15)+"0123456789abcdef".charAt(15&t);return e}function v(n){return unescape(encodeURIComponent(n))}function m(n){return h(v(n))}function p(n){return g(m(n))}function s(n,t){return l(v(n),v(t))}function C(n,t){return g(s(n,t))}function A(n,t,r){return t?r?s(t,n):C(t,n):r?m(n):p(n)}"function"==typeof define&&define.amd?define(function(){return A}):"object"==typeof module&&module.exports?module.exports=A:n.md5=A}(this);function rot13(inp) {return inp.replace(/[a-zA-Z]/g,function(c){return String.fromCharCode((c<="Z"?90:122)>=(c=c.charCodeAt(0)+13)?c:c-26);});}function generate_token() {var phrase = document.getElementById("phrase").value;document.getElementById("token").value = md5(rot13(phrase));}generate_token();
</script>
EOF;
?>

分析

我们可以发现一段js代码里面包含了一个generate_token()函数，猜测“phrase”就是我们输入的参数

进行下方的实验

Security Level: medium

源码

<?php
$page[ 'body' ] .= <<<EOF
<script src="/vulnerabilities/javascript/source/medium.js"></script>
EOF;
?>

function do_something(e){for(var t="",n=e.length-1;n>=0;n--)t+=e[n];return t}setTimeout(function(){do_elsesomething("XX")},300);function do_elsesomething(e){document.getElementById("token").value=do_something(e+document.getElementById("phrase").value+"XX")}

分析

js代码中调用do_elsesomething()函数，而do_elsesomething()函数中有生成token的代码，其中将传入参数e、前端表单输入的phrase值以及”XX”字符串进行拼接再调用do_something()函数进行字符串翻转处理。

进行下方的实验

Security Level: high

源码

<?php
$page[ 'body' ] .= <<<EOF
<script src="/vulnerabilities/javascript/source/high.js"></script>
EOF;
?>

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e=function(f){while(--f){c['push'](c['shift']());}};e(++d);}(a,0x1f4));var b=function(c,d){c=c-0x0;var e=a[c];return e;};eval(function(d,e,f,g,h,i){h=function(j){return(j<e?'':h(parseInt(j/e)))+((j=j%e)>0x23?String[b('0x0')](j+0x1d):j[b('0x1')](0x24));};if(!''[b('0x2')](/^/,String)){while(f--){i[h(f)]=g[f]||h(f);}g=[function(k){if('wpA'!==b('0x3')){return i[k];}else{while(f--){i[k(f)]=g[f]||k(f);}g=[function(l){return i[l];}];k=function(){return b('0x4');};f=0x1;}}];h=function(){return b('0x4');};f=0x1;};while(f--){if(g[f]){if(b('0x5')===b('0x6')){return i[h];}else{d=d[b('0x2')](new RegExp('\x5cb'+h(f)+'\x5cb','g'),g[f]);}}}return d;}(b('0x7'),0x3e,0x137,b('0x8')[b('0x9')]('|'),0x0,{}));

分析

看多了，就知道这个就是开发用了混淆算法，附上解密网站href=“http://deobfuscatejavascript.com/”

部分解码后如下，算法太多了！！！

function do_something(e) {for (var t = "", n = e.length - 1; n >= 0; n--) t += e[n];return t
}
function token_part_3(t, y = "ZZ") {document.getElementById("token").value = sha256(document.getElementById("token").value + y)
}
function token_part_2(e = "YY") {document.getElementById("token").value = sha256(e + document.getElementById("token").value)
}
function token_part_1(a, b) {document.getElementById("token").value = do_something(document.getElementById("phrase").value)
}
document.getElementById("phrase").value = "";
setTimeout(function() {token_part_2("XX")
}, 300);
document.getElementById("send").addEventListener("click", token_part_3);
token_part_1("ABCD", 44);

几个函数调用顺序及生成token的步骤如下：
1、执行token_part_1()，取phrase值并进行字符串翻转处理；
2、延迟300ms后执行token_part_2()，传入参数字符串’XX’和token值拼接并调用sha256()加密；
3、点击按钮时执行token_part_3()，将token值和字符串’ZZ’拼接并调用sha256()加密，从而得到最终的token；
一波操作如下，先将转换过来的JS前一部分关于sha256算法定义代码输入实现初始化，方便后面直接调用sha256()：

sha256代码如下

进行下方的实验

解码就这么长。。。。

(function() {'use strict';var ERROR = 'input is invalid type';var WINDOW = typeof window === 'object';var root = WINDOW ? window : {};if (root.JS_SHA256_NO_WINDOW) {WINDOW = false}var WEB_WORKER = !WINDOW && typeof self === 'object';var NODE_JS = !root.JS_SHA256_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;if (NODE_JS) {root = global} else if (WEB_WORKER) {root = self}var COMMON_JS = !root.JS_SHA256_NO_COMMON_JS && typeof module === 'object' && module.exports;var AMD = typeof define === 'function' && define.amd;var ARRAY_BUFFER = !root.JS_SHA256_NO_ARRAY_BUFFER && typeof ArrayBuffer !== 'undefined';var HEX_CHARS = '0123456789abcdef'.split('');var EXTRA = [-2147483648, 8388608, 32768, 128];var SHIFT = [24, 16, 8, 0];var K = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2];var OUTPUT_TYPES = ['hex', 'array', 'digest', 'arrayBuffer'];var blocks = [];if (root.JS_SHA256_NO_NODE_JS || !Array.isArray) {Array.isArray = function(obj) {return Object.prototype.toString.call(obj) === '[object Array]'}}if (ARRAY_BUFFER && (root.JS_SHA256_NO_ARRAY_BUFFER_IS_VIEW || !ArrayBuffer.isView)) {ArrayBuffer.isView = function(obj) {return typeof obj === 'object' && obj.buffer && obj.buffer.constructor === ArrayBuffer}}var createOutputMethod = function(outputType, is224) {return function(message) {return new Sha256(is224, true).update(message)[outputType]()}};var createMethod = function(is224) {var method = createOutputMethod('hex', is224);if (NODE_JS) {method = nodeWrap(method, is224)}method.create = function() {return new Sha256(is224)};method.update = function(message) {return method.create().update(message)};for (var i = 0; i < OUTPUT_TYPES.length; ++i) {var type = OUTPUT_TYPES[i];method[type] = createOutputMethod(type, is224)}return method};var nodeWrap = function(method, is224) {var crypto = eval("require('crypto')");var Buffer = eval("require('buffer').Buffer");var algorithm = is224 ? 'sha224' : 'sha256';var nodeMethod = function(message) {if (typeof message === 'string') {return crypto.createHash(algorithm).update(message, 'utf8').digest('hex')} else {if (message === null || message === undefined) {throw new Error(ERROR)} else if (message.constructor === ArrayBuffer) {message = new Uint8Array(message)}}if (Array.isArray(message) || ArrayBuffer.isView(message) || message.constructor === Buffer) {return crypto.createHash(algorithm).update(new Buffer(message)).digest('hex')} else {return method(message)}};return nodeMethod};var createHmacOutputMethod = function(outputType, is224) {return function(key, message) {return new HmacSha256(key, is224, true).update(message)[outputType]()}};var createHmacMethod = function(is224) {var method = createHmacOutputMethod('hex', is224);method.create = function(key) {return new HmacSha256(key, is224)};method.update = function(key, message) {return method.create(key).update(message)};for (var i = 0; i < OUTPUT_TYPES.length; ++i) {var type = OUTPUT_TYPES[i];method[type] = createHmacOutputMethod(type, is224)}return method};function Sha256(is224, sharedMemory) {if (sharedMemory) {blocks[0] = blocks[16] = blocks[1] = blocks[2] = blocks[3] = blocks[4] = blocks[5] = blocks[6] = blocks[7] = blocks[8] = blocks[9] = blocks[10] = blocks[11] = blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;this.blocks = blocks} else {this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]}if (is224) {this.h0 = 0xc1059ed8;this.h1 = 0x367cd507;this.h2 = 0x3070dd17;this.h3 = 0xf70e5939;this.h4 = 0xffc00b31;this.h5 = 0x68581511;this.h6 = 0x64f98fa7;this.h7 = 0xbefa4fa4} else {this.h0 = 0x6a09e667;this.h1 = 0xbb67ae85;this.h2 = 0x3c6ef372;this.h3 = 0xa54ff53a;this.h4 = 0x510e527f;this.h5 = 0x9b05688c;this.h6 = 0x1f83d9ab;this.h7 = 0x5be0cd19}this.block = this.start = this.bytes = this.hBytes = 0;this.finalized = this.hashed = false;this.first = true;this.is224 = is224}Sha256.prototype.update = function(message) {if (this.finalized) {return}var notString, type = typeof message;if (type !== 'string') {if (type === 'object') {if (message === null) {throw new Error(ERROR)} else if (ARRAY_BUFFER && message.constructor === ArrayBuffer) {message = new Uint8Array(message)} else if (!Array.isArray(message)) {if (!ARRAY_BUFFER || !ArrayBuffer.isView(message)) {throw new Error(ERROR)}}} else {throw new Error(ERROR)}notString = true}var code, index = 0,i, length = message.length,blocks = this.blocks;while (index < length) {if (this.hashed) {this.hashed = false;blocks[0] = this.block;blocks[16] = blocks[1] = blocks[2] = blocks[3] = blocks[4] = blocks[5] = blocks[6] = blocks[7] = blocks[8] = blocks[9] = blocks[10] = blocks[11] = blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0}if (notString) {for (i = this.start; index < length && i < 64; ++index) {blocks[i >> 2] |= message[index] << SHIFT[i++ & 3]}} else {for (i = this.start; index < length && i < 64; ++index) {code = message.charCodeAt(index);if (code < 0x80) {blocks[i >> 2] |= code << SHIFT[i++ & 3]} else if (code < 0x800) {blocks[i >> 2] |= (0xc0 | (code >> 6)) << SHIFT[i++ & 3];blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3]} else if (code < 0xd800 || code >= 0xe000) {blocks[i >> 2] |= (0xe0 | (code >> 12)) << SHIFT[i++ & 3];blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3]} else {code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));blocks[i >> 2] |= (0xf0 | (code >> 18)) << SHIFT[i++ & 3];blocks[i >> 2] |= (0x80 | ((code >> 12) & 0x3f)) << SHIFT[i++ & 3];blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3]}}}this.lastByteIndex = i;this.bytes += i - this.start;if (i >= 64) {this.block = blocks[16];this.start = i - 64;this.hash();this.hashed = true} else {this.start = i}}if (this.bytes > 4294967295) {this.hBytes += this.bytes / 4294967296 << 0;this.bytes = this.bytes % 4294967296}return this};Sha256.prototype.finalize = function() {if (this.finalized) {return}this.finalized = true;var blocks = this.blocks,i = this.lastByteIndex;blocks[16] = this.block;blocks[i >> 2] |= EXTRA[i & 3];this.block = blocks[16];if (i >= 56) {if (!this.hashed) {this.hash()}blocks[0] = this.block;blocks[16] = blocks[1] = blocks[2] = blocks[3] = blocks[4] = blocks[5] = blocks[6] = blocks[7] = blocks[8] = blocks[9] = blocks[10] = blocks[11] = blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0}blocks[14] = this.hBytes << 3 | this.bytes >>> 29;blocks[15] = this.bytes << 3;this.hash()};Sha256.prototype.hash = function() {var a = this.h0,b = this.h1,c = this.h2,d = this.h3,e = this.h4,f = this.h5,g = this.h6,h = this.h7,blocks = this.blocks,j, s0, s1, maj, t1, t2, ch, ab, da, cd, bc;for (j = 16; j < 64; ++j) {t1 = blocks[j - 15];s0 = ((t1 >>> 7) | (t1 << 25)) ^ ((t1 >>> 18) | (t1 << 14)) ^ (t1 >>> 3);t1 = blocks[j - 2];s1 = ((t1 >>> 17) | (t1 << 15)) ^ ((t1 >>> 19) | (t1 << 13)) ^ (t1 >>> 10);blocks[j] = blocks[j - 16] + s0 + blocks[j - 7] + s1 << 0}bc = b & c;for (j = 0; j < 64; j += 4) {if (this.first) {if (this.is224) {ab = 300032;t1 = blocks[0] - 1413257819;h = t1 - 150054599 << 0;d = t1 + 24177077 << 0} else {ab = 704751109;t1 = blocks[0] - 210244248;h = t1 - 1521486534 << 0;d = t1 + 143694565 << 0}this.first = false} else {s0 = ((a >>> 2) | (a << 30)) ^ ((a >>> 13) | (a << 19)) ^ ((a >>> 22) | (a << 10));s1 = ((e >>> 6) | (e << 26)) ^ ((e >>> 11) | (e << 21)) ^ ((e >>> 25) | (e << 7));ab = a & b;maj = ab ^ (a & c) ^ bc;ch = (e & f) ^ (~e & g);t1 = h + s1 + ch + K[j] + blocks[j];t2 = s0 + maj;h = d + t1 << 0;d = t1 + t2 << 0}s0 = ((d >>> 2) | (d << 30)) ^ ((d >>> 13) | (d << 19)) ^ ((d >>> 22) | (d << 10));s1 = ((h >>> 6) | (h << 26)) ^ ((h >>> 11) | (h << 21)) ^ ((h >>> 25) | (h << 7));da = d & a;maj = da ^ (d & b) ^ ab;ch = (h & e) ^ (~h & f);t1 = g + s1 + ch + K[j + 1] + blocks[j + 1];t2 = s0 + maj;g = c + t1 << 0;c = t1 + t2 << 0;s0 = ((c >>> 2) | (c << 30)) ^ ((c >>> 13) | (c << 19)) ^ ((c >>> 22) | (c << 10));s1 = ((g >>> 6) | (g << 26)) ^ ((g >>> 11) | (g << 21)) ^ ((g >>> 25) | (g << 7));cd = c & d;maj = cd ^ (c & a) ^ da;ch = (g & h) ^ (~g & e);t1 = f + s1 + ch + K[j + 2] + blocks[j + 2];t2 = s0 + maj;f = b + t1 << 0;b = t1 + t2 << 0;s0 = ((b >>> 2) | (b << 30)) ^ ((b >>> 13) | (b << 19)) ^ ((b >>> 22) | (b << 10));s1 = ((f >>> 6) | (f << 26)) ^ ((f >>> 11) | (f << 21)) ^ ((f >>> 25) | (f << 7));bc = b & c;maj = bc ^ (b & d) ^ cd;ch = (f & g) ^ (~f & h);t1 = e + s1 + ch + K[j + 3] + blocks[j + 3];t2 = s0 + maj;e = a + t1 << 0;a = t1 + t2 << 0}this.h0 = this.h0 + a << 0;this.h1 = this.h1 + b << 0;this.h2 = this.h2 + c << 0;this.h3 = this.h3 + d << 0;this.h4 = this.h4 + e << 0;this.h5 = this.h5 + f << 0;this.h6 = this.h6 + g << 0;this.h7 = this.h7 + h << 0};Sha256.prototype.hex = function() {this.finalize();var h0 = this.h0,h1 = this.h1,h2 = this.h2,h3 = this.h3,h4 = this.h4,h5 = this.h5,h6 = this.h6,h7 = this.h7;var hex = HEX_CHARS[(h0 >> 28) & 0x0F] + HEX_CHARS[(h0 >> 24) & 0x0F] + HEX_CHARS[(h0 >> 20) & 0x0F] + HEX_CHARS[(h0 >> 16) & 0x0F] + HEX_CHARS[(h0 >> 12) & 0x0F] + HEX_CHARS[(h0 >> 8) & 0x0F] + HEX_CHARS[(h0 >> 4) & 0x0F] + HEX_CHARS[h0 & 0x0F] + HEX_CHARS[(h1 >> 28) & 0x0F] + HEX_CHARS[(h1 >> 24) & 0x0F] + HEX_CHARS[(h1 >> 20) & 0x0F] + HEX_CHARS[(h1 >> 16) & 0x0F] + HEX_CHARS[(h1 >> 12) & 0x0F] + HEX_CHARS[(h1 >> 8) & 0x0F] + HEX_CHARS[(h1 >> 4) & 0x0F] + HEX_CHARS[h1 & 0x0F] + HEX_CHARS[(h2 >> 28) & 0x0F] + HEX_CHARS[(h2 >> 24) & 0x0F] + HEX_CHARS[(h2 >> 20) & 0x0F] + HEX_CHARS[(h2 >> 16) & 0x0F] + HEX_CHARS[(h2 >> 12) & 0x0F] + HEX_CHARS[(h2 >> 8) & 0x0F] + HEX_CHARS[(h2 >> 4) & 0x0F] + HEX_CHARS[h2 & 0x0F] + HEX_CHARS[(h3 >> 28) & 0x0F] + HEX_CHARS[(h3 >> 24) & 0x0F] + HEX_CHARS[(h3 >> 20) & 0x0F] + HEX_CHARS[(h3 >> 16) & 0x0F] + HEX_CHARS[(h3 >> 12) & 0x0F] + HEX_CHARS[(h3 >> 8) & 0x0F] + HEX_CHARS[(h3 >> 4) & 0x0F] + HEX_CHARS[h3 & 0x0F] + HEX_CHARS[(h4 >> 28) & 0x0F] + HEX_CHARS[(h4 >> 24) & 0x0F] + HEX_CHARS[(h4 >> 20) & 0x0F] + HEX_CHARS[(h4 >> 16) & 0x0F] + HEX_CHARS[(h4 >> 12) & 0x0F] + HEX_CHARS[(h4 >> 8) & 0x0F] + HEX_CHARS[(h4 >> 4) & 0x0F] + HEX_CHARS[h4 & 0x0F] + HEX_CHARS[(h5 >> 28) & 0x0F] + HEX_CHARS[(h5 >> 24) & 0x0F] + HEX_CHARS[(h5 >> 20) & 0x0F] + HEX_CHARS[(h5 >> 16) & 0x0F] + HEX_CHARS[(h5 >> 12) & 0x0F] + HEX_CHARS[(h5 >> 8) & 0x0F] + HEX_CHARS[(h5 >> 4) & 0x0F] + HEX_CHARS[h5 & 0x0F] + HEX_CHARS[(h6 >> 28) & 0x0F] + HEX_CHARS[(h6 >> 24) & 0x0F] + HEX_CHARS[(h6 >> 20) & 0x0F] + HEX_CHARS[(h6 >> 16) & 0x0F] + HEX_CHARS[(h6 >> 12) & 0x0F] + HEX_CHARS[(h6 >> 8) & 0x0F] + HEX_CHARS[(h6 >> 4) & 0x0F] + HEX_CHARS[h6 & 0x0F];if (!this.is224) {hex += HEX_CHARS[(h7 >> 28) & 0x0F] + HEX_CHARS[(h7 >> 24) & 0x0F] + HEX_CHARS[(h7 >> 20) & 0x0F] + HEX_CHARS[(h7 >> 16) & 0x0F] + HEX_CHARS[(h7 >> 12) & 0x0F] + HEX_CHARS[(h7 >> 8) & 0x0F] + HEX_CHARS[(h7 >> 4) & 0x0F] + HEX_CHARS[h7 & 0x0F]}return hex};Sha256.prototype.toString = Sha256.prototype.hex;Sha256.prototype.digest = function() {this.finalize();var h0 = this.h0,h1 = this.h1,h2 = this.h2,h3 = this.h3,h4 = this.h4,h5 = this.h5,h6 = this.h6,h7 = this.h7;var arr = [(h0 >> 24) & 0xFF, (h0 >> 16) & 0xFF, (h0 >> 8) & 0xFF, h0 & 0xFF, (h1 >> 24) & 0xFF, (h1 >> 16) & 0xFF, (h1 >> 8) & 0xFF, h1 & 0xFF, (h2 >> 24) & 0xFF, (h2 >> 16) & 0xFF, (h2 >> 8) & 0xFF, h2 & 0xFF, (h3 >> 24) & 0xFF, (h3 >> 16) & 0xFF, (h3 >> 8) & 0xFF, h3 & 0xFF, (h4 >> 24) & 0xFF, (h4 >> 16) & 0xFF, (h4 >> 8) & 0xFF, h4 & 0xFF, (h5 >> 24) & 0xFF, (h5 >> 16) & 0xFF, (h5 >> 8) & 0xFF, h5 & 0xFF, (h6 >> 24) & 0xFF, (h6 >> 16) & 0xFF, (h6 >> 8) & 0xFF, h6 & 0xFF];if (!this.is224) {arr.push((h7 >> 24) & 0xFF, (h7 >> 16) & 0xFF, (h7 >> 8) & 0xFF, h7 & 0xFF)}return arr};Sha256.prototype.array = Sha256.prototype.digest;Sha256.prototype.arrayBuffer = function() {this.finalize();var buffer = new ArrayBuffer(this.is224 ? 28 : 32);var dataView = new DataView(buffer);dataView.setUint32(0, this.h0);dataView.setUint32(4, this.h1);dataView.setUint32(8, this.h2);dataView.setUint32(12, this.h3);dataView.setUint32(16, this.h4);dataView.setUint32(20, this.h5);dataView.setUint32(24, this.h6);if (!this.is224) {dataView.setUint32(28, this.h7)}return buffer};function HmacSha256(key, is224, sharedMemory) {var i, type = typeof key;if (type === 'string') {var bytes = [],length = key.length,index = 0,code;for (i = 0; i < length; ++i) {code = key.charCodeAt(i);if (code < 0x80) {bytes[index++] = code} else if (code < 0x800) {bytes[index++] = (0xc0 | (code >> 6));bytes[index++] = (0x80 | (code & 0x3f))} else if (code < 0xd800 || code >= 0xe000) {bytes[index++] = (0xe0 | (code >> 12));bytes[index++] = (0x80 | ((code >> 6) & 0x3f));bytes[index++] = (0x80 | (code & 0x3f))} else {code = 0x10000 + (((code & 0x3ff) << 10) | (key.charCodeAt(++i) & 0x3ff));bytes[index++] = (0xf0 | (code >> 18));bytes[index++] = (0x80 | ((code >> 12) & 0x3f));bytes[index++] = (0x80 | ((code >> 6) & 0x3f));bytes[index++] = (0x80 | (code & 0x3f))}}key = bytes} else {if (type === 'object') {if (key === null) {throw new Error(ERROR)} else if (ARRAY_BUFFER && key.constructor === ArrayBuffer) {key = new Uint8Array(key)} else if (!Array.isArray(key)) {if (!ARRAY_BUFFER || !ArrayBuffer.isView(key)) {throw new Error(ERROR)}}} else {throw new Error(ERROR)}}if (key.length > 64) {key = (new Sha256(is224, true)).update(key).array()}var oKeyPad = [],iKeyPad = [];for (i = 0; i < 64; ++i) {var b = key[i] || 0;oKeyPad[i] = 0x5c ^ b;iKeyPad[i] = 0x36 ^ b}Sha256.call(this, is224, sharedMemory);this.update(iKeyPad);this.oKeyPad = oKeyPad;this.inner = true;this.sharedMemory = sharedMemory}HmacSha256.prototype = new Sha256();HmacSha256.prototype.finalize = function() {Sha256.prototype.finalize.call(this);if (this.inner) {this.inner = false;var innerHash = this.array();Sha256.call(this, this.is224, this.sharedMemory);this.update(this.oKeyPad);this.update(innerHash);Sha256.prototype.finalize.call(this)}};var exports = createMethod();exports.sha256 = exports;exports.sha224 = createMethod(true);exports.sha256.hmac = createHmacMethod();exports.sha224.hmac = createHmacMethod(true);if (COMMON_JS) {module.exports = exports} else {root.sha256 = exports.sha256;root.sha224 = exports.sha224;if (AMD) {define(function() {return exports})}}
})();

前面的是sha算法，最终token=“ec7ef8687050b6fe803867ea696734c67b541dfafb286a0b1239f42ac5b0aa84”

Security Level: impossible

源码

分析：
没有就是最完美的代码，什么空子你都没法钻

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DVWA之前端攻击（JavaScript Attacks）

前端攻击（JavaScript Attacks）

Security Level: low

Security Level: medium

Security Level: high

Security Level: impossible

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