CVE-2021–38314
Unauthenticated Sensitive Information Disclosure | CVE-2021–38314
CVE-2021–38314
I was teaching my friend about bug hunting and we found this bug accidentally.
I’m Shubhayu Majumdar, currently pursuing BTech in Computer Science, and I hunt bugs as a hobby. During our research, we came across a subdomain https://blog.redated.com is vulnerable with Unauthenticated Sensitive Information Disclosure (CVE-2021–38314).
What is 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`.
Now, let’s look at the bug.
Bugs found:
- CVE-2021–38314 in blog.redated.com
Proof of Concept:
I found this vulnerability on blog.redated.com and used this script (shubhayu-64/CVE-2021–38314) to generate the exploit link.
The exploit link looks like this.
Voila
Impact:
Attacker can retrieve sensitive information such as 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`. This would be most useful in cases where a separate plugin with an additional vulnerability was installed, as an attacker could use the information to save time and plan an intrusion.
Reference:
- https://www.wordfence.com/blog/2021/09/over-1-million-sites-affected-by-redux-framework-vulnerabilities/
- https://wahaz.medium.com/unauthenticated-sensitive-information-disclosure-at-redacted-2702224098c
A collaboration with Shubham Singh.
Hope you enjoyed it :)
Cheers & Stay Safe !! :) ❤
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