An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Moodle | Moodle | * | 3.9.22 (excluding) |
| Moodle | Moodle | 3.11.0 (including) | 3.11.15 (excluding) |
| Moodle | Moodle | 4.0.0 (including) | 4.0.9 (excluding) |
| Moodle | Moodle | 4.1.0 (including) | 4.1.4 (excluding) |
| Moodle | Moodle | 4.2.0 (including) | 4.2.0 (including) |
| Moodle | Ubuntu | bionic | * |
| Moodle | Ubuntu | trusty | * |
| Moodle | Ubuntu | xenial | * |