CTFshow-菜鸡杯 WriteUp

发布于 2020-08-30  313 次阅读

这次不是正规的大赛事，所以题目难度把控也不太到位，不过难度挺适合我这种菜鸡的。

web

摇号入园

首先打开给出的靶场网站，开幕雷击，直接报错，太强了，debug没关，看来应该就是从这个报错入手了。报错关键语句如下：

eval($_POST[1]);

这不就是经典的一句话木马嘛，那就打开蚁剑，密码填1，连接！
蚁剑服务器配置
连接成功后网站目录如下图：
网站目录
题目提示说找邮箱，根据我多年建站的经验，一般发信邮箱的配置都是在env文件或者config.php文件里，于是就找到了下面这东西。
源码自带配置文件
去网易163那边登录了一波，还真成功登上了，于是觉得这波稳了，因为我看登录记录里没有别人。
但是翻遍了整个邮箱，收发件、垃圾箱、已删、自动回复、收信规则都看了，愣是没发现flag...
于是又回头看了一下赛题，已经有人解出来了，但是我这边没有别人的登录记录啊？？？于是发现方向错了。

后来发现这个邮箱账号是网站源码自带的，作者发布的时候就没删除测试数据...差评。

回头找了一下其他可能的配置文件，发现了个MySQL。
邮箱配置文件
然后又用网站目录里的PHP探针tz.php测了一下连通性，可以连上，于是猜测邮箱应该在数据库里。
但是用蚁剑的数据库管理试了一下，连不上，报了个get_magic_quotes_gpc函数已弃用的错误，可能是蚁剑php版本的锅。
于是上网找了一下php写的数据库管理工具（为啥要用php，因为这个靶场网站在docker里，数据库端口的3306是内部的，没暴露在公网里，想直连是不存在的，只能用php让服务器去连接自身），发现了个叫adminer的单php文件数据库管理工具：Adminer - Database management in a single PHP file，传到网站目录上，填入数据库信息，连接！
Adminer

关于为啥要填127.0.0.1而不能填服务器公网IP，其实就是上面说的docker端口映射问题。

连接成功后数据库目录如下图：
数据库
打开名字比较像存储配置的那个表——kite_site_config：
kite_site_config
切换到选择数据功能选项卡：
kite_site_config
就能找到邮箱相关的字段，得到flag。
kite_site_config

flag：flag{ctf_show_boy}

misc

猎兔

首先得到一张png，pngcheck后发现crc校验出错，于是跑一下高度爆破脚本去修复图片高度，修复后多出来文字区域似乎并没有什么用。
完整图片
然后群里面出题人为了表示这张图没有传错，去试了一下低位隐写并发了截图，截图大致如下：
低位
于是知道了这题是G色0位竖向隐写，提取出数据后，观察发现flag{虽然在开头，但是个字符之间的间隔字符越来越多，于是结合兔子关键词可以联想到斐波那契数列（ACM的斐波那契练习就有兔子生兔子的题，这个问题似乎挺著名的）。编写脚本尝试斐波那契数列提取字符。

f = open("flag.txt", "rb")
bin = f.read()
a=0; b=1; c=0; flag = ''
while True:
    c = a + b; a=b; b=c
    flag += chr(bin[c - 1])
    if(chr(bin[c - 1]) == "}"):
        break
print(flag)

猜测成立，得到flag。

flag：flag{Fibonacci_sequence}

初音未来-圆周率之歌

首先得到一首mp3，查看属性后没什么有用的信息，查了一下专辑名称发现音源是网易云的，但去看了一下原曲有一个多小时，于是对比法基本上是没法用了。
用010editor打开看了一下，发现尾部有非预期数据，但是010的模板没有精确识别文件尾，差评！
010
提取出文本如下：

2750 3
2535 3
739 2
3487 3
1925 3
451 2
898 2
1479 2
1623 2
1541 2
1232 2
1118 2
1780 2
594 2
2033 2
79 2
1193 2
406 2
1623 2
774 2
1223 2
1351 3

感觉和圆周率文本有关，去查了一下这串数的位置，发现挺乱的，而且不唯一，就没思路了。
之后群里出题人提醒说福尔摩斯里有一种字典查询的方法，用a b表示第a页的第b个单词，拓展一下可以理解为第a个位置起的b个字符，也就是python的[a:a+b]。那么如果思路正确，从圆周率里面取出来的是2位或3位数字，那么猜测应该是ascii，于是去先将flag{的ascii转出来，在圆周率里面查了一下每个ascii，发现位置都符合要求，那么猜测成立，编写脚本即可得到flag。（圆周率数据来自100,000 Digits of Pi）

pi = "这里填写圆周率"
pos = [2750,2535,739,3487,1925,451,898,1479,1623,1541,1232,1118,1780,594,2033,79,1193,406,1623,774,1223,1351]
len = [3,3,2,3,3,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3]
str = ''
for i, j in zip(pos, len):
    str += chr(int(pi[i:i+j]))
print(str)

flag：flag{PI_IS_EVERYTHING}

差一点

首先得到一个txt文件，其中只由[]()!+这几个符合组成，于是判断出是js的混淆，因为以前见过，不过不知道具体的混淆算法叫什么，于是去上网查了一下，得到名称JSFuck，那么直接用JSfuck Decoder | De-Obfuscator解混淆，就能拿到flag。

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if(1===2){console.log('flag{u_r_v3ry_g00d}');}

群大佬表示用控制台就能搞出来，tql。不过要去掉尾部的()，这是为什么呢？可以上网查一下自调用函数/自执行函数这个概念，JavaScript 函数定义 | 菜鸟教程，定义格式是(function 名称(参数){代码})()，而如果去掉尾部的()，那么就变成了(function 名称(参数){代码})，那么就变成了命名函数表达式，会返回这个函数定义。具体可见浅谈JavaScript之function用括号包起来_xiaocai0923-CSDN博客。至于为啥不去掉括号让它直接执行不行呢？当然是因为1===2不可能成立啦！

flag：flag{u_r_v3ry_g00d}

crypto

天仙金丹心法

题目是：○ 须要：次想把常面知本用都部道文哈是用已本连希无来比净题续即用凑如妙道密进可的字真法在海码行：○ 数灭自屎凡器只三后全而神然溺鼎归心。
这题刚开始没啥思路，上网查了一下天仙金丹心法发现就是本书，于是就没头绪了。后来过了一会又回头看了一下，重新查了一下天仙金丹心法，发现了这么个博客：古典常用密码_leofionn的博客-CSDN博客，里面就有关于这个类栅栏算法的介绍，解密后得到：

○ 须
要：次
想把常面
知本用都部
道文哈是用已
本连希无来比净
题续即用凑如妙道
密进可的字真法在海
码行：○ 数灭自屎凡器
只三后全而神然溺鼎归心

提高一下可读性就是这样子：○ 要想知道本题密码只须：把本文连续进行三次常用哈希即可：后面都是无用的○ 全部用来凑字数而已比如真灭神净妙法自然道在屎溺海凡鼎器归心
常用hash嘛...先猜一手32位小写md5，因为确实是最常用的，没有之一，然后明文的话，在下面这几个里面选，然后暴力提交一波，总能出来flag：

把本文连续进行三次常用哈希即可
要想知道本题密码只须：把本文连续进行三次常用哈希即可：后面都是无用的
○ 要想知道本题密码只须：把本文连续进行三次常用哈希即可：后面都是无用的○ 
○ 要想知道本题密码只须：把本文连续进行三次常用哈希即可：后面都是无用的○ 全部用来凑字数而已比如真灭神净妙法自然道在屎溺海凡鼎器归心
○ 须要：次想把常面知本用都部道文哈是用已本连希无来比净题续即用凑如妙道密进可的字真法在海码行：○ 数灭自屎凡器只三后全而神然溺鼎归心

最终知道○ 须要：次想把常面知本用都部道文哈是用已本连希无来比净题续即用凑如妙道密进可的字真法在海码行：○ 数灭自屎凡器只三后全而神然溺鼎归心就是明文，于是得到flag。

flag：flag{67c46c4eabd37bb422910e9b400980fd}

reverse

wyy

这题的话，打开IDA，一脸懵逼，告辞。
od里打开试试，F8跟几下，跟到00401527 call 0x004012D0，多跟两轮就知道这里是主要函数，F7步入，发现004012E3有反调试，于是将与之相关的004012EB je 0x00401300改为jne 0x00401300（有些od自带反反调试，不用改也行），然后跟到0040130E，等时间变成12:00:00，就可以打开网易云继续跟，跟到00401330 call 0x00401060，是个输入，随便输入个数，我输的是5，然后跟到00401338 call 0x00401170，多跟两轮就知道这里是主要函数，F7步入，然后发现关键判断语句004011D9 cmp dword ptr ds:[eax], edi所判断的东西正好有一个是我输入的5，那么另一个应该就是正确输入了，也就是EDI寄存器的20Ah，即522，于是重新打开程序，输入即可得到flag。
od

flag：flag{1836}

boss

题目给出的python源码如下：

import wmi
import time

for i in ['N','B','N','B','N','B','N','B','N','B','B','B','N','B','B','B','N','B','B','N','B','N','N','B','N','B','B','N','B','B','B','N']: 
    wmi.WMI(namespace='root\WMI').WmiMonitorBrightnessMethods()[0].WmiSetBrightness(Brightness=ord(i), Timeout=500)
    time.sleep(chr('!'))

#菜鸡中的BOSS，简称菜包丝

wmi好像是和硬件有关的库，然后查询WmiMonitorBrightnessMethods和WmiSetBrightness得到这是一个亮灯用的函数，那么猜测N和B应该可以代表0和1或者1和0，两种情况都试一下，发现第一种情况得到的二进制可以转为可读的ascii文本，即Uwin，然后就拿到了flag。（好像有点简单）

flag：flag{Uwin}

最后总结一下，我还是个菜鸡，适合打菜鸡杯。