A flaw was found in Moodle. A remote attacker could exploit a lack of proper rate limiting in the confirmation email service. This vulnerability allows attackers to more easily enumerate or guess user credentials, facilitating brute-force attacks against user accounts.
Weakness
The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Moodle | Moodle | * | 4.1.22 (excluding) |
| Moodle | Moodle | 4.4.0 (including) | 4.4.11 (excluding) |
| Moodle | Moodle | 4.5.0 (including) | 4.5.8 (excluding) |
| Moodle | Moodle | 5.0.0 (including) | 5.0.4 (excluding) |
| Moodle | Moodle | 5.1.0 (including) | 5.1.0 (including) |
Potential Mitigations
Common protection mechanisms include:
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
Consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator. [REF-45]
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/16.html
- https://cwe.mitre.org/data/definitions/49.html
- https://cwe.mitre.org/data/definitions/560.html
- https://cwe.mitre.org/data/definitions/565.html
- https://cwe.mitre.org/data/definitions/600.html
- https://cwe.mitre.org/data/definitions/652.html
- https://cwe.mitre.org/data/definitions/653.html