Unauthenticated Sensitive Information Disclosure at [REDACTED]

Hello InfoSec Community, I want to share my submission about this vulnerability, sorry for bad writing, still learning ✌

During my research, I was found the subdomain https://blog.redacted.com/ is vulnerable with Unauthenticated Sensitive Information Disclosure (CVE-2021–38314).

The Gutenberg Template Library & Redux Framework plugin <= 4.2.11 for WordPress registered several AJAX actions available to unauthenticated users in the `includes` function in `redux-core/class-redux-core.php` that were unique to a given site but deterministic and predictable given that they were based on an md5 hash of the site URL with a known salt value of ‘-redux’ and an md5 hash of the previous hash with a known salt value of ‘-support’.

These AJAX actions could be used to retrieve a list of active plugins and their versions, the site’s PHP version, and an unsalted md5 hash of site’s `AUTH_KEY` concatenated with the `SECURE_AUTH_KEY`.

Proof of Concept:

1. Found subdomain blog.redacted.com is using wordpress, then try the CVE-2021–38314

2. Using this script

$target = “https://blog.redacted.com";
$key1 = md5(“$target/-redux”);
$key2 = file_get_contents(“$target/wp-admin/admin-ajax.php?action=$key1”);

3. It returns e24eb61b09bf2340779b35xxxxxxxxxx a hash of the auth_key_secret_key with “-redux” appended.