CVE-2024-23336 Information

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.

Reference

https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75h https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630 https://docs.mybb.com/1.8/administration/configuration-file https://mybb.com/versions/1.8.38