2019-3-16 dvwa学习(16)--JavaScript Attacks JS攻击

DVWA的JS攻击练习是为了帮助用户了解如何在浏览器中使用JavaScript和攻击者如何控制JavaScript实施攻击。

看实例：成功提交success
low
界面上尝试一下，输入success

果然不成功，“Invalid token”。

看代码

<?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;
?>

其实就是生成了一个token，用的是md5加密。这段代码在JavaScript中，也就是前台生成的。这个和dvwa前面的例子不一样，前面例子都是调用dvwaPage.inc.php中的generateSessionToken()函数在后台生成的。

再看index.php中的相关部分

if ($_SERVER['REQUEST_METHOD'] == "POST") {if (array_key_exists ("phrase", $_POST) && array_key_exists ("token", $_POST)) {$phrase = $_POST['phrase'];$token = $_POST['token'];if ($phrase == "success") {switch( $_COOKIE[ 'security' ] ) {case 'low':if ($token == md5(str_rot13("success"))) {$message = "<p style='color:red'>Well done!</p>";} else {$message = "<p>Invalid token.</p>";}break;

知道怎么回事情了？参数里有token，然后和md5(str_rot13(“success”))进行比较，一样就给你well done。
所以打开浏览器的开发者工具，在控制带执行函数 generate_token();
然后界面上输入success，提交，成功。

medium
先看代码
medium.php

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

medium.js

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")
}

似乎不是用md加密token，而且token生成放在单独的js文件中。最终就是把"XXphrase的值XX"字符串反转作为token。

再看index.php

 case 'medium':if ($token == strrev("XXsuccessXX")) {$message = "<p style='color:red'>Well done!</p>";} else {$message = "<p>Invalid token.</p>";}break;

原来如此，就是把"XXsuccessXX"反转和token进行比较。

我们先直接输入success提交后，看结果

看到嘛，此时token是XXChangeMeXX反转生成的，奥秘就是那延时300毫秒上。

解决方法：输入success，然后控制台直接执行do_elsesomething(“XX”)来生成token。结果well done了。

high
看源码

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

high.js

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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,{}));

这里的js代码应该是被混淆过了。找了攻略，使用 http://deobfuscatejavascript.com 这个网站可以解除混淆。关键代码如下

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);

说明如下：
1.由于有300毫秒延时，所以先执行了token_part_1(“ABCD”, 44);
2.然后再执行了 token_part_2(“XX”)
3.token_part_3被添加在提交按钮的click事件上，也就是点提交会触发执行。

再看index.php中对比部分

 case 'high':if ($token == hash("sha256", hash("sha256", "XX" . strrev("success")) . "ZZ")) {$message = "<p style='color:red'>Well done!</p>";} else {$message = "<p>Invalid token.</p>";}break;

知道该怎么干了嘛？输入success，控制台上执行token_part_1(1,2)和 token_part_2(“XX”)，然后点击按钮（token_part_3会被执行）。
结果成功。界面不截了。

impossible
真逗！！！

You can never trust anything that comes from the user or prevent them from messing with it and so there is no impossible level.

所以token还是不要靠前台JS生成了。

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2019-3-16 dvwa学习(16)--JavaScript Attacks JS攻击

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