CVE-2024-23336 Incomplete disallowed remote addresses list in MyBB
Incomplete default IP blocklist in MyBB allows Server-Side Request Forgery, enabling attackers to access internal resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-23336?
CVE-2024-23336 is a medium-severity server-side request forgery vulnerability in Mybb Mybb, published on 1 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0.0/8` block, which may result in a Server-Side Request Forgery (SSRF) vulnerability. The Configuration File's _Disallowed Remote Addresses_ list (`$config['disallowed_remote_addresses']`) contains the address `127.0.0.1`, but does not include the complete block `127.0.0.0/8`. MyBB 1.8.38 resolves this issue in default installations. Administrators of installed boards should update the existing configuration (`inc/config.php`) to include all addresses blocked by default. Additionally, users are advised to verify that it includes any other IPv4 addresses resolving to the server and other internal resources. Users unable to upgrade may manually add 127.0.0.0/8' to their disallowed address list.
Which versions are affected by CVE-2024-23336?
It affects 1 product.
Products include Mybb Mybb.
How do I fix CVE-2024-23336?
No fix has been published for CVE-2024-23336 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2024-23336 being exploited?
There is no known exploitation of CVE-2024-23336 in the wild and no public exploit code.
Other vulnerabilities in Mybb Mybb
Sources
Also known as GHSA-qfrj-65mv-h75h.