Flask-AppBuilder open redirect vulnerability using HTTP host injection

Impact

Flask-AppBuilder prior to 4.6.2 would allow for a malicious unauthenticated actor to perform an open redirect by manipulating the Host header in HTTP requests.

Patches

Flask-AppBuilder 4.6.2 introduced the FAB_SAFE_REDIRECT_HOSTS configuration variable, which allows administrators to explicitly define which domains are considered safe for redirection.

Examples:

FAB_SAFE_REDIRECT_HOSTS = ["yourdomain.com", "sub.yourdomain.com", "*.yourcompany.com"]

Workarounds

Use a Reverse Proxy to Enforce Trusted Host Headers

References

Are there any links users can visit to find out more?