Django REST framework is a toolkit for building Web APIs. Prior to 3.17.2, Django REST Frameworks request.data parsing in rest_framework/request.py Request._parse() passes the underlying HttpRequest stream to JSONParser and FormParser for application/json and application/x-www-form-urlencoded bodies, bypassing Djangos DATA_UPLOAD_MAX_MEMORY_SIZE protection and allowing oversized request bodies to consume additional memory and CPU. This issue is fixed in version 3.17.2.
Weakness
The product does not properly control the allocation and maintenance of a limited resource.
Potential Mitigations
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/147.html
- https://cwe.mitre.org/data/definitions/227.html
- https://cwe.mitre.org/data/definitions/492.html
References
- https://github.com/encode/django-rest-framework/commit/2912dc98042f78e27636551fc22eeaf10f725fdd
- https://github.com/encode/django-rest-framework/commit/82ef7b7e4e0a73ba5c489b465fae7e76d948da4e
- https://github.com/encode/django-rest-framework/pull/10013
- https://github.com/encode/django-rest-framework/security/advisories/GHSA-2m8g-3cmr-wg3w
- https://github.com/encode/django-rest-framework/security/advisories/GHSA-2m8g-3cmr-wg3w