怎么就是不弹出key呢？
题目描述:
提交说明：提交前14个字符即可过关
题目界面
思路：
1.进行点击测试，没有反应，直接进行代码审计
发现点击执行js代码
function alert(a){
return false;
}
document.write=function(){
return false;
}
function prompt(a){
return false;
}
var a=function (){
var b=function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('1s(1e(p,a,c,k,e,r){e=1e(c){1d(c<a?\'\':e(1p(c/a)))+((c=c%a)>1q?1f.1j(c+1k):c.1n(1o))};1g(!\'\'.1h(/^/,1f)){1i(c--)r[e(c)]=k[c]||e(c);k=[1e(e){1d r[e]}];e=1e(){1d\'\\\\w+\'};c=1};1i(c--)1g(k[c])p=p.1h(1l 1m(\'\\\\b\'+e(c)+\'\\\\b\',\'g\'),k[c]);1d p}(\'Y(R(p,a,c,k,e,r){e=R(c){S(c<a?\\\'\\\':e(18(c/a)))+((c=c%a)>17?T.16(c+15):c.12(13))};U(!\\\'\\\'.V(/^/,T)){W(c--)r[e(c)]=k[c]||e(c);k=[R(e){S r[e]}];e=R(){S\\\'\\\\\\\\w+\\\'};c=1};W(c--)U(k[c])p=p.V(Z 11(\\\'\\\\\\\\b\\\'+e(c)+\\\'\\\\\\\\b\\\',\\\'g\\\'),k[c]);S p}(\\\'G(B(p,a,c,k,e,r){e=B(c){A c.L(a)};E(!\\\\\\\'\\\\\\\'.C(/^/,F)){D(c--)r[e(c)]=k[c]||e(c);k=[B(e){A r[e]}];e=B(){A\\\\\\\'\\\\\\\\\\\\\\\\w+\\\\\\\'};c=1};D(c--)E(k[c])p=p.C(I J(\\\\\\\'\\\\\\\\\\\\\\\\b\\\\\\\'+e(c)+\\\\\\\'\\\\\\\\\\\\\\\\b\\\\\\\',\\\\\\\'g\\\\\\\'),k[c]);A p}(\\\\\\\'t(h(p,a,c,k,e,r){e=o;n(!\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\'.m(/^/,o)){l(c--)r[c]=k[c]||c;k=[h(e){f r[e]}];e=h(){f\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\w+\\\\\\\\\\\\\\\'};c=1};l(c--)n(k[c])p=p.m(q s(\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\b\\\\\\\\\\\\\\\'+e(c)+\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\b\\\\\\\\\\\\\\\',\\\\\\\\\\\\\\\'g\\\\\\\\\\\\\\\'),k[c]);f p}(\\\\\\\\\\\\\\\'1 3="6";1 4="7";1 5="";8(1 2=0;2<9;2++){5+=3+4}\\\\\\\\\\\\\\\',j,j,\\\\\\\\\\\\\\\'|u|i|b|c|d|v|x|y|j\\\\\\\\\\\\\\\'.z(\\\\\\\\\\\\\\\'|\\\\\\\\\\\\\\\'),0,{}))\\\\\\\',H,H,\\\\\\\'|||||||||||||||A||B||M||D|C|E|F||I||J|G|N|O||P|Q|K\\\\\\\'.K(\\\\\\\'|\\\\\\\'),0,{}))\\\',X,X,\\\'||||||||||||||||||||||||||||||||||||S|R|V|W|U|T|Y|13|Z|11|14|12|10|19|1a|1b|1c\\\'.14(\\\'|\\\'),0,{}))\',1t,1u,\'|||||||||||||||||||||||||||||||||||||||||||||||||||||1e|1d|1f|1g|1h|1i|1v|1s|1l||1m|1n|1o|1r|1k|1j|1q|1p|1w|1x|1y|1z\'.1r(\'|\'),0,{}))',62,98,'|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||return|function|String|if|replace|while|fromCharCode|29|new|RegExp|toString|36|parseInt|35|split|eval|62|75|53|var|slakfj|teslkjsdflk|for'.split('|'),0,{});
var d=eval(b);
alert("key is first 14 chars"+d);
}
- 由于禁止弹窗，且核心代码为a函数，所以可以将代码简化如下
var a=function (){
var b=function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('1s(1e(p,a,c,k,e,r){e=1e(c){1d(c<a?\'\':e(1p(c/a)))+((c=c%a)>1q?1f.1j(c+1k):c.1n(1o))};1g(!\'\'.1h(/^/,1f)){1i(c--)r[e(c)]=k[c]||e(c);k=[1e(e){1d r[e]}];e=1e(){1d\'\\\\w+\'};c=1};1i(c--)1g(k[c])p=p.1h(1l 1m(\'\\\\b\'+e(c)+\'\\\\b\',\'g\'),k[c]);1d p}(\'Y(R(p,a,c,k,e,r){e=R(c){S(c<a?\\\'\\\':e(18(c/a)))+((c=c%a)>17?T.16(c+15):c.12(13))};U(!\\\'\\\'.V(/^/,T)){W(c--)r[e(c)]=k[c]||e(c);k=[R(e){S r[e]}];e=R(){S\\\'\\\\\\\\w+\\\'};c=1};W(c--)U(k[c])p=p.V(Z 11(\\\'\\\\\\\\b\\\'+e(c)+\\\'\\\\\\\\b\\\',\\\'g\\\'),k[c]);S p}(\\\'G(B(p,a,c,k,e,r){e=B(c){A c.L(a)};E(!\\\\\\\'\\\\\\\'.C(/^/,F)){D(c--)r[e(c)]=k[c]||e(c);k=[B(e){A r[e]}];e=B(){A\\\\\\\'\\\\\\\\\\\\\\\\w+\\\\\\\'};c=1};D(c--)E(k[c])p=p.C(I J(\\\\\\\'\\\\\\\\\\\\\\\\b\\\\\\\'+e(c)+\\\\\\\'\\\\\\\\\\\\\\\\b\\\\\\\',\\\\\\\'g\\\\\\\'),k[c]);A p}(\\\\\\\'t(h(p,a,c,k,e,r){e=o;n(!\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\'.m(/^/,o)){l(c--)r[c]=k[c]||c;k=[h(e){f r[e]}];e=h(){f\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\w+\\\\\\\\\\\\\\\'};c=1};l(c--)n(k[c])p=p.m(q s(\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\b\\\\\\\\\\\\\\\'+e(c)+\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\b\\\\\\\\\\\\\\\',\\\\\\\\\\\\\\\'g\\\\\\\\\\\\\\\'),k[c]);f p}(\\\\\\\\\\\\\\\'1 3="6";1 4="7";1 5="";8(1 2=0;2<9;2++){5+=3+4}\\\\\\\\\\\\\\\',j,j,\\\\\\\\\\\\\\\'|u|i|b|c|d|v|x|y|j\\\\\\\\\\\\\\\'.z(\\\\\\\\\\\\\\\'|\\\\\\\\\\\\\\\'),0,{}))\\\\\\\',H,H,\\\\\\\'|||||||||||||||A||B||M||D|C|E|F||I||J|G|N|O||P|Q|K\\\\\\\'.K(\\\\\\\'|\\\\\\\'),0,{}))\\\',X,X,\\\'||||||||||||||||||||||||||||||||||||S|R|V|W|U|T|Y|13|Z|11|14|12|10|19|1a|1b|1c\\\'.14(\\\'|\\\'),0,{}))\',1t,1u,\'|||||||||||||||||||||||||||||||||||||||||||||||||||||1e|1d|1f|1g|1h|1i|1v|1s|1l||1m|1n|1o|1r|1k|1j|1q|1p|1w|1x|1y|1z\'.1r(\'|\'),0,{}))',62,98,'|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||return|function|String|if|replace|while|fromCharCode|29|new|RegExp|toString|36|parseInt|35|split|eval|62|75|53|var|slakfj|teslkjsdflk|for'.split('|'),0,{});
var d=eval(b);
alert("key is first 14 chars"+d);
}
- 对函数进行alert()部分进行修改，改为console.log()以控制台输出
alert("key is first 14 chars"+d);改为 console.log(d);
4.使用浏览器执行调用方法，输出d
进行函数执行，显示d的值
5.根据提示，输出的内容前14位为正确答案
进行提交验证:
成功提交
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