bugku web 你必须让它停下矛盾头等舱 web3 web5

本文链接：https://blog.youkuaiyun.com/thinszx/article/details/104704173

web3

burp抓包重放，提示304 not modified，请求头如下

GET /web3/ HTTP/1.1
Host: 123.206.87.240:8002
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/82.0.4071.0 Safari/537.36 Edg/82.0.445.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6
If-Modified-Since: Sat, 15 Apr 2017 14:57:03 GMT
Connection: close

随便修改If-Modified-Since即可，得到KEY{J2sa42ahJK-HS11III}

html编码，转换一下KEY{J2sa42ahJK-HS11III}

你必须让它停下

打开以后页面会不断刷新，burp抓包截取，然后重放几次，因为返回的图片是随机的，所以多repeat几次就拿到flag了
在这里插入图片描述

矛盾

打开网页是一段代码

$num=$_GET['num'];
if(!is_numeric($num))
{
echo $num;
if($num==1)
echo 'flag{**********}';
}

服务端会获取传入的num值并与1进行比较，要满足两个条件：

不能是数字
值与1相同，

在php中，==和===在判断上有很大的出入，之前一直不理解，今天查了一下做了篇笔记，用?num=1'11直接绕过比较就好了

web5

打开看是jsfuck，f12在网页源码里找到了下面的字段

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拿去转一下，可以用这个网站，得到ctf{whatfk}，提交说不对，首页提示大写，改成全大写CTF{WHATFK}就对了