Fix Improper Assets Management in Falcon
Improper Assets Management (API9:2023) occurs when shadow APIs, deprecated versions, or 'dark' endpoints are left exposed in production. In the Falcon ecosystem, this usually manifests as legacy routes pointing to unpatched logic or debug resources left active. Attackers map these forgotten assets to bypass modern security controls implemented on current versions.
The Vulnerable Pattern
import falconclass LegacyUserResource: def on_get(self, req, resp): # DEPRECATED: Still returns sensitive fields and lacks rate limiting resp.media = {‘id’: 1, ‘username’: ‘admin’, ‘internal_hash’: ‘sha1$deadbeef’}
class CurrentUserResource: def on_get(self, req, resp): resp.media = {‘id’: 1, ‘username’: ‘admin’}
app = falcon.App()
V1 is undocumented but still reachable
app.add_route(‘/api/v1/user’, LegacyUserResource()) app.add_route(‘/api/v2/user’, CurrentUserResource())
The Secure Implementation
To mitigate asset sprawl in Falcon, you must implement a strict decommissioning workflow. First, prune the routing table: if a resource is deprecated, remove its `add_route` call entirely. Second, use environment variables to control which API versions are loaded, preventing 'accidental' deployment of staging or legacy assets. Third, for assets in transition, implement a middleware that injects the 'Sunset' HTTP header (RFC 8594) to notify consumers of impending removal, and eventually return 410 Gone instead of 404 to distinguish between 'not found' and 'dead asset'.
import falcon import osclass CurrentUserResource: def on_get(self, req, resp): resp.media = {‘id’: 1, ‘username’: ‘admin’}
def get_app(): app = falcon.App()
# 1. Explicit Versioning Policy # 2. Environment-based route registration # 3. Use of 'Sunset' headers for deprecation active_version = os.getenv('API_ACTIVE_VERSION', 'v2') if active_version == 'v2': app.add_route('/api/v2/user', CurrentUserResource()) # Legacy v1 is physically removed from the routing table # Or redirected to a 410 Gone with a Sunset header return app
app = get_app()
Your Falcon API
might be exposed to Improper Assets Management
74% of Falcon apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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