Improper Assets Management (OWASP API9:2023) in Hug occurs when developers leave 'Shadow APIs'—deprecated, unpatched, or internal-only versions—exposed in production. In Hug's micro-routing system, failing to explicitly version-gate or environment-check routes allows attackers to discover and exploit legacy vulnerabilities that were supposed to be retired. If you aren't tracking your attack surface, you're basically leaving a back door open for anyone who can fuzz your URI paths.

The Vulnerable Pattern

import hug
V1: Deprecated and unauthenticated legacy endpoint
@hug.get(‘/v1/internal/config’)
def legacy_config():
return {‘db_host’: ‘10.0.0.5’, ‘debug’: True}
V2: Current authenticated endpoint
@hug.get(‘/v2/config’, requires=hug.authentication.basic)
def secure_config(user: hug.directives.user):
return {‘status’: ‘active’}
Debug asset exposed to the public internet
@hug.get(‘/debug/dump’)
def debug_dump():
return {‘memory_map’: ‘0x7ffd…‘}

The Secure Implementation

To fix improper asset management in Hug, you must enforce a strict lifecycle policy. First, migrate from global routing to explicit API objects to control the scope. Second, use HTTP 410 (Gone) status codes for deprecated routes instead of simply leaving them live or returning a generic 404; this tells clients (and security scanners) the asset is intentionally removed. Third, use environment variables to prevent internal debug assets or documentation from mounting in production. Finally, always ensure that your 'vNext' security patches are backported to any legacy versions that cannot be immediately decommissioned, or force-redirect them to the current authenticated version.

import hug
import os
1. Use explicit API versioning objects
api = hug.API(name)
2. Environment-based asset exposure
IS_DEV = os.getenv(‘APP_ENV’) == ‘development’
@hug.get(‘/v2/config’, api=api, requires=hug.authentication.token)
def secure_config(user: hug.directives.user):
return {‘status’: ‘active’}
3. Explicitly decommission legacy assets with 410 Gone
@hug.get(‘/v1/internal/config’, api=api)
def retired_endpoint(response):
response.status = hug.HTTP_410
return {‘error’: ‘This API version is deprecated and removed.’}
4. Gate internal assets to development environments only
if IS_DEV:
@hug.get(‘/debug/dump’, api=api)
def debug_dump():
return {‘debug_info’: ‘local_only’}