Fider before 0.38.0 contains a server-side request forgery vulnerability due to a time-of-check time-of-use gap in URL validation for webhooks and custom OAuth provider endpoints. Administrators controlling DNS can perform DNS rebinding attacks to make the Fider server send requests to internal services or cloud metadata endpoints.
Weakness
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.
Related Attack Patterns
References
- https://github.com/getfider/fider
- https://github.com/getfider/fider/blob/v0.37.0/app/pkg/validate/general.go
- https://github.com/getfider/fider/blob/v0.37.0/app/services/httpclient/httpclient.go
- https://github.com/getfider/fider/commit/45f5627b9fd15b912fb9092635c863fb4c91dd69
- https://github.com/getfider/fider/releases/tag/v0.38.0
- https://github.com/getfider/fider/security/advisories/GHSA-whx4-hxwq-qgjh
- https://www.vulncheck.com/advisories/fider-before-0.38.0-ssrf-via-dns-rebinding-in-webhook-validation